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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 |
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 |
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 |
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 |
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.cox.net/jerrypb/ "L.W. ("ßill") ------ III" <----------@cox.net> wrote in message news:4165E017.D034A6BB@cox.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 |
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.cox.net/jerrypb/ "L.W. ("ßill") ------ III" <----------@cox.net> wrote in message news:4165E017.D034A6BB@cox.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 |
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.cox.net/jerrypb/ "L.W. ("ßill") ------ III" <----------@cox.net> wrote in message news:4165E017.D034A6BB@cox.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 |
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 ass. :/ 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. :( |
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 ass. :/ 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. :( |
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 ass. :/ 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. :( |
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