fuel pressure q, 4.0
10-07-2004, 07:41 PM
#1
Guest
Posts: n/a
fuel pressure q, 4.0
Stinking rough idle will not go away but I think
I've found the problem with the miss after heat-soak.
There is a TSB for putting insulation around the #3
fuel injector.
Anyhoo..
- Fuel pressure, no run, 33psi
- Fuel pressure, run, 33 psi
- Giving it the gas I notice the pressure does
fluctuate quite a bit but returns to steady
with engine rpm. Might be the pump having
a hard time keeping up with surges?
- Take the vac line off the fuel rail
pressure regulator, run, 40psi
- Engine off after run, 30psi then....
The fuel pressure gauge creeped up from 30psi to 36psi
and vaporbubbles come out the drain hose when I dumped
it.... Boiling fuel. :(
Guess I could wrap the injectors with insulation
and insulate the fuel rail.
Does leave me wondering if this is "normal" to have
some buildup after a shutdown.
To top it off, the only place around here I could find
a good fuel pressure tester with release drain was Sears..
OW. Oh well, the tester should last a good long time
and it qualifies as a new toy. :)
Haven't left the gauge on and put it under boost, the
hose isn't long enough to reach where it can be seen.
My thoughts are now circling around both a week pump and
one or several faulty injectors, plus heat soak.
Feeling a shotgun solution coming up. :) Any suggestions
on pumps or should I swallow the lump and go OEM? Otherwise
it would probably be NAPA.
--
DougW
I've found the problem with the miss after heat-soak.
There is a TSB for putting insulation around the #3
fuel injector.
Anyhoo..
- Fuel pressure, no run, 33psi
- Fuel pressure, run, 33 psi
- Giving it the gas I notice the pressure does
fluctuate quite a bit but returns to steady
with engine rpm. Might be the pump having
a hard time keeping up with surges?
- Take the vac line off the fuel rail
pressure regulator, run, 40psi
- Engine off after run, 30psi then....
The fuel pressure gauge creeped up from 30psi to 36psi
and vaporbubbles come out the drain hose when I dumped
it.... Boiling fuel. :(
Guess I could wrap the injectors with insulation
and insulate the fuel rail.
Does leave me wondering if this is "normal" to have
some buildup after a shutdown.
To top it off, the only place around here I could find
a good fuel pressure tester with release drain was Sears..
OW. Oh well, the tester should last a good long time
and it qualifies as a new toy. :)
Haven't left the gauge on and put it under boost, the
hose isn't long enough to reach where it can be seen.
My thoughts are now circling around both a week pump and
one or several faulty injectors, plus heat soak.
Feeling a shotgun solution coming up. :) Any suggestions
on pumps or should I swallow the lump and go OEM? Otherwise
it would probably be NAPA.
--
DougW
10-07-2004, 08:32 PM
#2
Guest
Posts: n/a
Re: fuel pressure q, 4.0
Hi Doug,
My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
five pounds per square inch:
http://www.----------.com/97TJfuelSystem.pdf
God Bless America, ßill O|||||||O
mailto:--------------------
DougW wrote:
>
> Stinking rough idle will not go away but I think
> I've found the problem with the miss after heat-soak.
> There is a TSB for putting insulation around the #3
> fuel injector.
>
> Anyhoo..
>
> - Fuel pressure, no run, 33psi
> - Fuel pressure, run, 33 psi
> - Giving it the gas I notice the pressure does
> fluctuate quite a bit but returns to steady
> with engine rpm. Might be the pump having
> a hard time keeping up with surges?
> - Take the vac line off the fuel rail
> pressure regulator, run, 40psi
> - Engine off after run, 30psi then....
> The fuel pressure gauge creeped up from 30psi to 36psi
> and vaporbubbles come out the drain hose when I dumped
> it.... Boiling fuel. :(
>
> Guess I could wrap the injectors with insulation
> and insulate the fuel rail.
>
> Does leave me wondering if this is "normal" to have
> some buildup after a shutdown.
>
> To top it off, the only place around here I could find
> a good fuel pressure tester with release drain was Sears..
> OW. Oh well, the tester should last a good long time
> and it qualifies as a new toy. :)
>
> Haven't left the gauge on and put it under boost, the
> hose isn't long enough to reach where it can be seen.
>
> My thoughts are now circling around both a week pump and
> one or several faulty injectors, plus heat soak.
>
> Feeling a shotgun solution coming up. :) Any suggestions
> on pumps or should I swallow the lump and go OEM? Otherwise
> it would probably be NAPA.
>
> --
> DougW
My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
five pounds per square inch:
http://www.----------.com/97TJfuelSystem.pdf
God Bless America, ßill O|||||||O
mailto:--------------------
DougW wrote:
>
> Stinking rough idle will not go away but I think
> I've found the problem with the miss after heat-soak.
> There is a TSB for putting insulation around the #3
> fuel injector.
>
> Anyhoo..
>
> - Fuel pressure, no run, 33psi
> - Fuel pressure, run, 33 psi
> - Giving it the gas I notice the pressure does
> fluctuate quite a bit but returns to steady
> with engine rpm. Might be the pump having
> a hard time keeping up with surges?
> - Take the vac line off the fuel rail
> pressure regulator, run, 40psi
> - Engine off after run, 30psi then....
> The fuel pressure gauge creeped up from 30psi to 36psi
> and vaporbubbles come out the drain hose when I dumped
> it.... Boiling fuel. :(
>
> Guess I could wrap the injectors with insulation
> and insulate the fuel rail.
>
> Does leave me wondering if this is "normal" to have
> some buildup after a shutdown.
>
> To top it off, the only place around here I could find
> a good fuel pressure tester with release drain was Sears..
> OW. Oh well, the tester should last a good long time
> and it qualifies as a new toy. :)
>
> Haven't left the gauge on and put it under boost, the
> hose isn't long enough to reach where it can be seen.
>
> My thoughts are now circling around both a week pump and
> one or several faulty injectors, plus heat soak.
>
> Feeling a shotgun solution coming up. :) Any suggestions
> on pumps or should I swallow the lump and go OEM? Otherwise
> it would probably be NAPA.
>
> --
> DougW
10-07-2004, 08:32 PM
#3
Guest
Posts: n/a
Re: fuel pressure q, 4.0
Hi Doug,
My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
five pounds per square inch:
http://www.----------.com/97TJfuelSystem.pdf
God Bless America, ßill O|||||||O
mailto:--------------------
DougW wrote:
>
> Stinking rough idle will not go away but I think
> I've found the problem with the miss after heat-soak.
> There is a TSB for putting insulation around the #3
> fuel injector.
>
> Anyhoo..
>
> - Fuel pressure, no run, 33psi
> - Fuel pressure, run, 33 psi
> - Giving it the gas I notice the pressure does
> fluctuate quite a bit but returns to steady
> with engine rpm. Might be the pump having
> a hard time keeping up with surges?
> - Take the vac line off the fuel rail
> pressure regulator, run, 40psi
> - Engine off after run, 30psi then....
> The fuel pressure gauge creeped up from 30psi to 36psi
> and vaporbubbles come out the drain hose when I dumped
> it.... Boiling fuel. :(
>
> Guess I could wrap the injectors with insulation
> and insulate the fuel rail.
>
> Does leave me wondering if this is "normal" to have
> some buildup after a shutdown.
>
> To top it off, the only place around here I could find
> a good fuel pressure tester with release drain was Sears..
> OW. Oh well, the tester should last a good long time
> and it qualifies as a new toy. :)
>
> Haven't left the gauge on and put it under boost, the
> hose isn't long enough to reach where it can be seen.
>
> My thoughts are now circling around both a week pump and
> one or several faulty injectors, plus heat soak.
>
> Feeling a shotgun solution coming up. :) Any suggestions
> on pumps or should I swallow the lump and go OEM? Otherwise
> it would probably be NAPA.
>
> --
> DougW
My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
five pounds per square inch:
http://www.----------.com/97TJfuelSystem.pdf
God Bless America, ßill O|||||||O
mailto:--------------------
DougW wrote:
>
> Stinking rough idle will not go away but I think
> I've found the problem with the miss after heat-soak.
> There is a TSB for putting insulation around the #3
> fuel injector.
>
> Anyhoo..
>
> - Fuel pressure, no run, 33psi
> - Fuel pressure, run, 33 psi
> - Giving it the gas I notice the pressure does
> fluctuate quite a bit but returns to steady
> with engine rpm. Might be the pump having
> a hard time keeping up with surges?
> - Take the vac line off the fuel rail
> pressure regulator, run, 40psi
> - Engine off after run, 30psi then....
> The fuel pressure gauge creeped up from 30psi to 36psi
> and vaporbubbles come out the drain hose when I dumped
> it.... Boiling fuel. :(
>
> Guess I could wrap the injectors with insulation
> and insulate the fuel rail.
>
> Does leave me wondering if this is "normal" to have
> some buildup after a shutdown.
>
> To top it off, the only place around here I could find
> a good fuel pressure tester with release drain was Sears..
> OW. Oh well, the tester should last a good long time
> and it qualifies as a new toy. :)
>
> Haven't left the gauge on and put it under boost, the
> hose isn't long enough to reach where it can be seen.
>
> My thoughts are now circling around both a week pump and
> one or several faulty injectors, plus heat soak.
>
> Feeling a shotgun solution coming up. :) Any suggestions
> on pumps or should I swallow the lump and go OEM? Otherwise
> it would probably be NAPA.
>
> --
> DougW
10-07-2004, 08:32 PM
#4
Guest
Posts: n/a
Re: fuel pressure q, 4.0
Hi Doug,
My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
five pounds per square inch:
http://www.----------.com/97TJfuelSystem.pdf
God Bless America, ßill O|||||||O
mailto:--------------------
DougW wrote:
>
> Stinking rough idle will not go away but I think
> I've found the problem with the miss after heat-soak.
> There is a TSB for putting insulation around the #3
> fuel injector.
>
> Anyhoo..
>
> - Fuel pressure, no run, 33psi
> - Fuel pressure, run, 33 psi
> - Giving it the gas I notice the pressure does
> fluctuate quite a bit but returns to steady
> with engine rpm. Might be the pump having
> a hard time keeping up with surges?
> - Take the vac line off the fuel rail
> pressure regulator, run, 40psi
> - Engine off after run, 30psi then....
> The fuel pressure gauge creeped up from 30psi to 36psi
> and vaporbubbles come out the drain hose when I dumped
> it.... Boiling fuel. :(
>
> Guess I could wrap the injectors with insulation
> and insulate the fuel rail.
>
> Does leave me wondering if this is "normal" to have
> some buildup after a shutdown.
>
> To top it off, the only place around here I could find
> a good fuel pressure tester with release drain was Sears..
> OW. Oh well, the tester should last a good long time
> and it qualifies as a new toy. :)
>
> Haven't left the gauge on and put it under boost, the
> hose isn't long enough to reach where it can be seen.
>
> My thoughts are now circling around both a week pump and
> one or several faulty injectors, plus heat soak.
>
> Feeling a shotgun solution coming up. :) Any suggestions
> on pumps or should I swallow the lump and go OEM? Otherwise
> it would probably be NAPA.
>
> --
> DougW
My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
five pounds per square inch:
http://www.----------.com/97TJfuelSystem.pdf
God Bless America, ßill O|||||||O
mailto:--------------------
DougW wrote:
>
> Stinking rough idle will not go away but I think
> I've found the problem with the miss after heat-soak.
> There is a TSB for putting insulation around the #3
> fuel injector.
>
> Anyhoo..
>
> - Fuel pressure, no run, 33psi
> - Fuel pressure, run, 33 psi
> - Giving it the gas I notice the pressure does
> fluctuate quite a bit but returns to steady
> with engine rpm. Might be the pump having
> a hard time keeping up with surges?
> - Take the vac line off the fuel rail
> pressure regulator, run, 40psi
> - Engine off after run, 30psi then....
> The fuel pressure gauge creeped up from 30psi to 36psi
> and vaporbubbles come out the drain hose when I dumped
> it.... Boiling fuel. :(
>
> Guess I could wrap the injectors with insulation
> and insulate the fuel rail.
>
> Does leave me wondering if this is "normal" to have
> some buildup after a shutdown.
>
> To top it off, the only place around here I could find
> a good fuel pressure tester with release drain was Sears..
> OW. Oh well, the tester should last a good long time
> and it qualifies as a new toy. :)
>
> Haven't left the gauge on and put it under boost, the
> hose isn't long enough to reach where it can be seen.
>
> My thoughts are now circling around both a week pump and
> one or several faulty injectors, plus heat soak.
>
> Feeling a shotgun solution coming up. :) Any suggestions
> on pumps or should I swallow the lump and go OEM? Otherwise
> it would probably be NAPA.
>
> --
> DougW
10-07-2004, 08:50 PM
#5
Guest
Posts: n/a
Re: fuel pressure q, 4.0
Hmmm, my '97 FSM says 39 psi at the rail. :)
Jerry
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
news:4165E017.D034A6BB@***.net...
> Hi Doug,
> My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
> five pounds per square inch:
> http://www.----------.com/97TJfuelSystem.pdf
> God Bless America, ßill O|||||||O
> mailto:--------------------
>
> DougW wrote:
>>
>> Stinking rough idle will not go away but I think
>> I've found the problem with the miss after heat-soak.
>> There is a TSB for putting insulation around the #3
>> fuel injector.
>>
>> Anyhoo..
>>
>> - Fuel pressure, no run, 33psi
>> - Fuel pressure, run, 33 psi
>> - Giving it the gas I notice the pressure does
>> fluctuate quite a bit but returns to steady
>> with engine rpm. Might be the pump having
>> a hard time keeping up with surges?
>> - Take the vac line off the fuel rail
>> pressure regulator, run, 40psi
>> - Engine off after run, 30psi then....
>> The fuel pressure gauge creeped up from 30psi to 36psi
>> and vaporbubbles come out the drain hose when I dumped
>> it.... Boiling fuel. :(
>>
>> Guess I could wrap the injectors with insulation
>> and insulate the fuel rail.
>>
>> Does leave me wondering if this is "normal" to have
>> some buildup after a shutdown.
>>
>> To top it off, the only place around here I could find
>> a good fuel pressure tester with release drain was Sears..
>> OW. Oh well, the tester should last a good long time
>> and it qualifies as a new toy. :)
>>
>> Haven't left the gauge on and put it under boost, the
>> hose isn't long enough to reach where it can be seen.
>>
>> My thoughts are now circling around both a week pump and
>> one or several faulty injectors, plus heat soak.
>>
>> Feeling a shotgun solution coming up. :) Any suggestions
>> on pumps or should I swallow the lump and go OEM? Otherwise
>> it would probably be NAPA.
>>
>> --
>> DougW
Jerry
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
news:4165E017.D034A6BB@***.net...
> Hi Doug,
> My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
> five pounds per square inch:
> http://www.----------.com/97TJfuelSystem.pdf
> God Bless America, ßill O|||||||O
> mailto:--------------------
>
> DougW wrote:
>>
>> Stinking rough idle will not go away but I think
>> I've found the problem with the miss after heat-soak.
>> There is a TSB for putting insulation around the #3
>> fuel injector.
>>
>> Anyhoo..
>>
>> - Fuel pressure, no run, 33psi
>> - Fuel pressure, run, 33 psi
>> - Giving it the gas I notice the pressure does
>> fluctuate quite a bit but returns to steady
>> with engine rpm. Might be the pump having
>> a hard time keeping up with surges?
>> - Take the vac line off the fuel rail
>> pressure regulator, run, 40psi
>> - Engine off after run, 30psi then....
>> The fuel pressure gauge creeped up from 30psi to 36psi
>> and vaporbubbles come out the drain hose when I dumped
>> it.... Boiling fuel. :(
>>
>> Guess I could wrap the injectors with insulation
>> and insulate the fuel rail.
>>
>> Does leave me wondering if this is "normal" to have
>> some buildup after a shutdown.
>>
>> To top it off, the only place around here I could find
>> a good fuel pressure tester with release drain was Sears..
>> OW. Oh well, the tester should last a good long time
>> and it qualifies as a new toy. :)
>>
>> Haven't left the gauge on and put it under boost, the
>> hose isn't long enough to reach where it can be seen.
>>
>> My thoughts are now circling around both a week pump and
>> one or several faulty injectors, plus heat soak.
>>
>> Feeling a shotgun solution coming up. :) Any suggestions
>> on pumps or should I swallow the lump and go OEM? Otherwise
>> it would probably be NAPA.
>>
>> --
>> DougW
10-07-2004, 08:50 PM
#6
Guest
Posts: n/a
Re: fuel pressure q, 4.0
Hmmm, my '97 FSM says 39 psi at the rail. :)
Jerry
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
news:4165E017.D034A6BB@***.net...
> Hi Doug,
> My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
> five pounds per square inch:
> http://www.----------.com/97TJfuelSystem.pdf
> God Bless America, ßill O|||||||O
> mailto:--------------------
>
> DougW wrote:
>>
>> Stinking rough idle will not go away but I think
>> I've found the problem with the miss after heat-soak.
>> There is a TSB for putting insulation around the #3
>> fuel injector.
>>
>> Anyhoo..
>>
>> - Fuel pressure, no run, 33psi
>> - Fuel pressure, run, 33 psi
>> - Giving it the gas I notice the pressure does
>> fluctuate quite a bit but returns to steady
>> with engine rpm. Might be the pump having
>> a hard time keeping up with surges?
>> - Take the vac line off the fuel rail
>> pressure regulator, run, 40psi
>> - Engine off after run, 30psi then....
>> The fuel pressure gauge creeped up from 30psi to 36psi
>> and vaporbubbles come out the drain hose when I dumped
>> it.... Boiling fuel. :(
>>
>> Guess I could wrap the injectors with insulation
>> and insulate the fuel rail.
>>
>> Does leave me wondering if this is "normal" to have
>> some buildup after a shutdown.
>>
>> To top it off, the only place around here I could find
>> a good fuel pressure tester with release drain was Sears..
>> OW. Oh well, the tester should last a good long time
>> and it qualifies as a new toy. :)
>>
>> Haven't left the gauge on and put it under boost, the
>> hose isn't long enough to reach where it can be seen.
>>
>> My thoughts are now circling around both a week pump and
>> one or several faulty injectors, plus heat soak.
>>
>> Feeling a shotgun solution coming up. :) Any suggestions
>> on pumps or should I swallow the lump and go OEM? Otherwise
>> it would probably be NAPA.
>>
>> --
>> DougW
Jerry
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
news:4165E017.D034A6BB@***.net...
> Hi Doug,
> My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
> five pounds per square inch:
> http://www.----------.com/97TJfuelSystem.pdf
> God Bless America, ßill O|||||||O
> mailto:--------------------
>
> DougW wrote:
>>
>> Stinking rough idle will not go away but I think
>> I've found the problem with the miss after heat-soak.
>> There is a TSB for putting insulation around the #3
>> fuel injector.
>>
>> Anyhoo..
>>
>> - Fuel pressure, no run, 33psi
>> - Fuel pressure, run, 33 psi
>> - Giving it the gas I notice the pressure does
>> fluctuate quite a bit but returns to steady
>> with engine rpm. Might be the pump having
>> a hard time keeping up with surges?
>> - Take the vac line off the fuel rail
>> pressure regulator, run, 40psi
>> - Engine off after run, 30psi then....
>> The fuel pressure gauge creeped up from 30psi to 36psi
>> and vaporbubbles come out the drain hose when I dumped
>> it.... Boiling fuel. :(
>>
>> Guess I could wrap the injectors with insulation
>> and insulate the fuel rail.
>>
>> Does leave me wondering if this is "normal" to have
>> some buildup after a shutdown.
>>
>> To top it off, the only place around here I could find
>> a good fuel pressure tester with release drain was Sears..
>> OW. Oh well, the tester should last a good long time
>> and it qualifies as a new toy. :)
>>
>> Haven't left the gauge on and put it under boost, the
>> hose isn't long enough to reach where it can be seen.
>>
>> My thoughts are now circling around both a week pump and
>> one or several faulty injectors, plus heat soak.
>>
>> Feeling a shotgun solution coming up. :) Any suggestions
>> on pumps or should I swallow the lump and go OEM? Otherwise
>> it would probably be NAPA.
>>
>> --
>> DougW
10-07-2004, 08:50 PM
#7
Guest
Posts: n/a
Re: fuel pressure q, 4.0
Hmmm, my '97 FSM says 39 psi at the rail. :)
Jerry
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
news:4165E017.D034A6BB@***.net...
> Hi Doug,
> My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
> five pounds per square inch:
> http://www.----------.com/97TJfuelSystem.pdf
> God Bless America, ßill O|||||||O
> mailto:--------------------
>
> DougW wrote:
>>
>> Stinking rough idle will not go away but I think
>> I've found the problem with the miss after heat-soak.
>> There is a TSB for putting insulation around the #3
>> fuel injector.
>>
>> Anyhoo..
>>
>> - Fuel pressure, no run, 33psi
>> - Fuel pressure, run, 33 psi
>> - Giving it the gas I notice the pressure does
>> fluctuate quite a bit but returns to steady
>> with engine rpm. Might be the pump having
>> a hard time keeping up with surges?
>> - Take the vac line off the fuel rail
>> pressure regulator, run, 40psi
>> - Engine off after run, 30psi then....
>> The fuel pressure gauge creeped up from 30psi to 36psi
>> and vaporbubbles come out the drain hose when I dumped
>> it.... Boiling fuel. :(
>>
>> Guess I could wrap the injectors with insulation
>> and insulate the fuel rail.
>>
>> Does leave me wondering if this is "normal" to have
>> some buildup after a shutdown.
>>
>> To top it off, the only place around here I could find
>> a good fuel pressure tester with release drain was Sears..
>> OW. Oh well, the tester should last a good long time
>> and it qualifies as a new toy. :)
>>
>> Haven't left the gauge on and put it under boost, the
>> hose isn't long enough to reach where it can be seen.
>>
>> My thoughts are now circling around both a week pump and
>> one or several faulty injectors, plus heat soak.
>>
>> Feeling a shotgun solution coming up. :) Any suggestions
>> on pumps or should I swallow the lump and go OEM? Otherwise
>> it would probably be NAPA.
>>
>> --
>> DougW
Jerry
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/
"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
news:4165E017.D034A6BB@***.net...
> Hi Doug,
> My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
> five pounds per square inch:
> http://www.----------.com/97TJfuelSystem.pdf
> God Bless America, ßill O|||||||O
> mailto:--------------------
>
> DougW wrote:
>>
>> Stinking rough idle will not go away but I think
>> I've found the problem with the miss after heat-soak.
>> There is a TSB for putting insulation around the #3
>> fuel injector.
>>
>> Anyhoo..
>>
>> - Fuel pressure, no run, 33psi
>> - Fuel pressure, run, 33 psi
>> - Giving it the gas I notice the pressure does
>> fluctuate quite a bit but returns to steady
>> with engine rpm. Might be the pump having
>> a hard time keeping up with surges?
>> - Take the vac line off the fuel rail
>> pressure regulator, run, 40psi
>> - Engine off after run, 30psi then....
>> The fuel pressure gauge creeped up from 30psi to 36psi
>> and vaporbubbles come out the drain hose when I dumped
>> it.... Boiling fuel. :(
>>
>> Guess I could wrap the injectors with insulation
>> and insulate the fuel rail.
>>
>> Does leave me wondering if this is "normal" to have
>> some buildup after a shutdown.
>>
>> To top it off, the only place around here I could find
>> a good fuel pressure tester with release drain was Sears..
>> OW. Oh well, the tester should last a good long time
>> and it qualifies as a new toy. :)
>>
>> Haven't left the gauge on and put it under boost, the
>> hose isn't long enough to reach where it can be seen.
>>
>> My thoughts are now circling around both a week pump and
>> one or several faulty injectors, plus heat soak.
>>
>> Feeling a shotgun solution coming up. :) Any suggestions
>> on pumps or should I swallow the lump and go OEM? Otherwise
>> it would probably be NAPA.
>>
>> --
>> DougW
10-07-2004, 09:12 PM
#8
Guest
Posts: n/a
Re: fuel pressure q, 4.0
Jerry Bransford did pass the time by typing:
> Hmmm, my '97 FSM says 39 psi at the rail. :)
32 is what my FSM says, but I've come across several
references to a newer, higher pressure pump refit.
Sometimes I wish this thing had a carb. Carbs I can
rebuild. Fuel injectors I can just look at and scratch
my ***. :/
Gonna throw some fiberglass insulation and high temp
tape around the injectors and rail.
Or punch a few dozen louvers in the hood. :)
>> Hi Doug,
>> My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
>> five pounds per square inch:
>> http://www.----------.com/97TJfuelSystem.pdf
>> DougW wrote:
>>> - Fuel pressure, no run, 33psi
>>> - Fuel pressure, run, 33 psi
>>> - Giving it the gas I notice the pressure does
>>> fluctuate quite a bit but returns to steady
>>> with engine rpm. Might be the pump having
>>> a hard time keeping up with surges?
>>> - Take the vac line off the fuel rail
>>> pressure regulator, run, 40psi
>>> - Engine off after run, 30psi then....
>>> The fuel pressure gauge creeped up from 30psi to 36psi
>>> and vaporbubbles come out the drain hose when I dumped
>>> it.... Boiling fuel. :(
> Hmmm, my '97 FSM says 39 psi at the rail. :)
32 is what my FSM says, but I've come across several
references to a newer, higher pressure pump refit.
Sometimes I wish this thing had a carb. Carbs I can
rebuild. Fuel injectors I can just look at and scratch
my ***. :/
Gonna throw some fiberglass insulation and high temp
tape around the injectors and rail.
Or punch a few dozen louvers in the hood. :)
>> Hi Doug,
>> My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
>> five pounds per square inch:
>> http://www.----------.com/97TJfuelSystem.pdf
>> DougW wrote:
>>> - Fuel pressure, no run, 33psi
>>> - Fuel pressure, run, 33 psi
>>> - Giving it the gas I notice the pressure does
>>> fluctuate quite a bit but returns to steady
>>> with engine rpm. Might be the pump having
>>> a hard time keeping up with surges?
>>> - Take the vac line off the fuel rail
>>> pressure regulator, run, 40psi
>>> - Engine off after run, 30psi then....
>>> The fuel pressure gauge creeped up from 30psi to 36psi
>>> and vaporbubbles come out the drain hose when I dumped
>>> it.... Boiling fuel. :(
10-07-2004, 09:12 PM
#9
Guest
Posts: n/a
Re: fuel pressure q, 4.0
Jerry Bransford did pass the time by typing:
> Hmmm, my '97 FSM says 39 psi at the rail. :)
32 is what my FSM says, but I've come across several
references to a newer, higher pressure pump refit.
Sometimes I wish this thing had a carb. Carbs I can
rebuild. Fuel injectors I can just look at and scratch
my ***. :/
Gonna throw some fiberglass insulation and high temp
tape around the injectors and rail.
Or punch a few dozen louvers in the hood. :)
>> Hi Doug,
>> My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
>> five pounds per square inch:
>> http://www.----------.com/97TJfuelSystem.pdf
>> DougW wrote:
>>> - Fuel pressure, no run, 33psi
>>> - Fuel pressure, run, 33 psi
>>> - Giving it the gas I notice the pressure does
>>> fluctuate quite a bit but returns to steady
>>> with engine rpm. Might be the pump having
>>> a hard time keeping up with surges?
>>> - Take the vac line off the fuel rail
>>> pressure regulator, run, 40psi
>>> - Engine off after run, 30psi then....
>>> The fuel pressure gauge creeped up from 30psi to 36psi
>>> and vaporbubbles come out the drain hose when I dumped
>>> it.... Boiling fuel. :(
> Hmmm, my '97 FSM says 39 psi at the rail. :)
32 is what my FSM says, but I've come across several
references to a newer, higher pressure pump refit.
Sometimes I wish this thing had a carb. Carbs I can
rebuild. Fuel injectors I can just look at and scratch
my ***. :/
Gonna throw some fiberglass insulation and high temp
tape around the injectors and rail.
Or punch a few dozen louvers in the hood. :)
>> Hi Doug,
>> My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
>> five pounds per square inch:
>> http://www.----------.com/97TJfuelSystem.pdf
>> DougW wrote:
>>> - Fuel pressure, no run, 33psi
>>> - Fuel pressure, run, 33 psi
>>> - Giving it the gas I notice the pressure does
>>> fluctuate quite a bit but returns to steady
>>> with engine rpm. Might be the pump having
>>> a hard time keeping up with surges?
>>> - Take the vac line off the fuel rail
>>> pressure regulator, run, 40psi
>>> - Engine off after run, 30psi then....
>>> The fuel pressure gauge creeped up from 30psi to 36psi
>>> and vaporbubbles come out the drain hose when I dumped
>>> it.... Boiling fuel. :(
10-07-2004, 09:12 PM
#10
Guest
Posts: n/a
Re: fuel pressure q, 4.0
Jerry Bransford did pass the time by typing:
> Hmmm, my '97 FSM says 39 psi at the rail. :)
32 is what my FSM says, but I've come across several
references to a newer, higher pressure pump refit.
Sometimes I wish this thing had a carb. Carbs I can
rebuild. Fuel injectors I can just look at and scratch
my ***. :/
Gonna throw some fiberglass insulation and high temp
tape around the injectors and rail.
Or punch a few dozen louvers in the hood. :)
>> Hi Doug,
>> My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
>> five pounds per square inch:
>> http://www.----------.com/97TJfuelSystem.pdf
>> DougW wrote:
>>> - Fuel pressure, no run, 33psi
>>> - Fuel pressure, run, 33 psi
>>> - Giving it the gas I notice the pressure does
>>> fluctuate quite a bit but returns to steady
>>> with engine rpm. Might be the pump having
>>> a hard time keeping up with surges?
>>> - Take the vac line off the fuel rail
>>> pressure regulator, run, 40psi
>>> - Engine off after run, 30psi then....
>>> The fuel pressure gauge creeped up from 30psi to 36psi
>>> and vaporbubbles come out the drain hose when I dumped
>>> it.... Boiling fuel. :(
> Hmmm, my '97 FSM says 39 psi at the rail. :)
32 is what my FSM says, but I've come across several
references to a newer, higher pressure pump refit.
Sometimes I wish this thing had a carb. Carbs I can
rebuild. Fuel injectors I can just look at and scratch
my ***. :/
Gonna throw some fiberglass insulation and high temp
tape around the injectors and rail.
Or punch a few dozen louvers in the hood. :)
>> Hi Doug,
>> My 01 XJ, and 97 TJ Factory Service Manuals, both call for forty
>> five pounds per square inch:
>> http://www.----------.com/97TJfuelSystem.pdf
>> DougW wrote:
>>> - Fuel pressure, no run, 33psi
>>> - Fuel pressure, run, 33 psi
>>> - Giving it the gas I notice the pressure does
>>> fluctuate quite a bit but returns to steady
>>> with engine rpm. Might be the pump having
>>> a hard time keeping up with surges?
>>> - Take the vac line off the fuel rail
>>> pressure regulator, run, 40psi
>>> - Engine off after run, 30psi then....
>>> The fuel pressure gauge creeped up from 30psi to 36psi
>>> and vaporbubbles come out the drain hose when I dumped
>>> it.... Boiling fuel. :(