Cherokee fuel press
04-22-2006, 06:54 PM
#11
Guest
Posts: n/a
Re: Cherokee fuel press
Hi Davey,
I would guess it's at least the fuel regulator:
http://members.***.net/wilsond/Fixes...tml#fuelsystem Pinch
off the return line and you should have ninety pounds, if not replace
the pump, too.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/
Davey wrote:
>
> Few months ago, Jeep was at authorised workshop and guy hooked it up
> on some kind a multitester for Chrysler/Jeep and complete test passed
> through all of electronic items and found nothing wrong. Guy told me he
> has no time to drive around with "tester thing" so we couldn't see what
> happens when it comes to loaded 2250 rpm.
> Mike, what about this fuel pressure, can it be just a damn pump?
> Logically, when you pinch return hose, pressure should jump very fast,
> right?
I would guess it's at least the fuel regulator:
http://members.***.net/wilsond/Fixes...tml#fuelsystem Pinch
off the return line and you should have ninety pounds, if not replace
the pump, too.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/
Davey wrote:
>
> Few months ago, Jeep was at authorised workshop and guy hooked it up
> on some kind a multitester for Chrysler/Jeep and complete test passed
> through all of electronic items and found nothing wrong. Guy told me he
> has no time to drive around with "tester thing" so we couldn't see what
> happens when it comes to loaded 2250 rpm.
> Mike, what about this fuel pressure, can it be just a damn pump?
> Logically, when you pinch return hose, pressure should jump very fast,
> right?
04-22-2006, 06:54 PM
#12
Guest
Posts: n/a
Re: Cherokee fuel press
Hi Davey,
I would guess it's at least the fuel regulator:
http://members.***.net/wilsond/Fixes...tml#fuelsystem Pinch
off the return line and you should have ninety pounds, if not replace
the pump, too.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/
Davey wrote:
>
> Few months ago, Jeep was at authorised workshop and guy hooked it up
> on some kind a multitester for Chrysler/Jeep and complete test passed
> through all of electronic items and found nothing wrong. Guy told me he
> has no time to drive around with "tester thing" so we couldn't see what
> happens when it comes to loaded 2250 rpm.
> Mike, what about this fuel pressure, can it be just a damn pump?
> Logically, when you pinch return hose, pressure should jump very fast,
> right?
I would guess it's at least the fuel regulator:
http://members.***.net/wilsond/Fixes...tml#fuelsystem Pinch
off the return line and you should have ninety pounds, if not replace
the pump, too.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/
Davey wrote:
>
> Few months ago, Jeep was at authorised workshop and guy hooked it up
> on some kind a multitester for Chrysler/Jeep and complete test passed
> through all of electronic items and found nothing wrong. Guy told me he
> has no time to drive around with "tester thing" so we couldn't see what
> happens when it comes to loaded 2250 rpm.
> Mike, what about this fuel pressure, can it be just a damn pump?
> Logically, when you pinch return hose, pressure should jump very fast,
> right?
04-22-2006, 06:54 PM
#13
Guest
Posts: n/a
Re: Cherokee fuel press
Hi Davey,
I would guess it's at least the fuel regulator:
http://members.***.net/wilsond/Fixes...tml#fuelsystem Pinch
off the return line and you should have ninety pounds, if not replace
the pump, too.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/
Davey wrote:
>
> Few months ago, Jeep was at authorised workshop and guy hooked it up
> on some kind a multitester for Chrysler/Jeep and complete test passed
> through all of electronic items and found nothing wrong. Guy told me he
> has no time to drive around with "tester thing" so we couldn't see what
> happens when it comes to loaded 2250 rpm.
> Mike, what about this fuel pressure, can it be just a damn pump?
> Logically, when you pinch return hose, pressure should jump very fast,
> right?
I would guess it's at least the fuel regulator:
http://members.***.net/wilsond/Fixes...tml#fuelsystem Pinch
off the return line and you should have ninety pounds, if not replace
the pump, too.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/
Davey wrote:
>
> Few months ago, Jeep was at authorised workshop and guy hooked it up
> on some kind a multitester for Chrysler/Jeep and complete test passed
> through all of electronic items and found nothing wrong. Guy told me he
> has no time to drive around with "tester thing" so we couldn't see what
> happens when it comes to loaded 2250 rpm.
> Mike, what about this fuel pressure, can it be just a damn pump?
> Logically, when you pinch return hose, pressure should jump very fast,
> right?
04-22-2006, 11:58 PM
#14
Guest
Posts: n/a
Re: Cherokee fuel press
I'm with Bill on this one. You should have 30-31 PSI with vacuum, 41
PSI with vacuum off. The fact that it will recover and run at higher
RPM after the stagger suggests that the pump has adequate capacity.
Best thing I can suggest is to check the pressure with the return
pinched first. If that gives 90+ PSI (don't hold it pinched any
longer than necessary) but still reads much below 30 PSI you could
also try a flow check by pinching the return line and opening the
schraeder valve on the fuel rail to pipe the gas to a bucket. I don't
have the number handy, but you will need to see a couple of
liters/minute flow that way. Then go buy a pressure regulator -
your's isn't holding what it's supposed to by a long shot. When my
pump was dying, anything below 20PSI would start it to stuttering.
On Sat, 22 Apr 2006 22:54:50 UTC "L.W.(Bill) ------ III"
<----------@***.net> wrote:
> Hi Davey,
> I would guess it's at least the fuel regulator:
> http://members.***.net/wilsond/Fixes...tml#fuelsystem Pinch
> off the return line and you should have ninety pounds, if not replace
> the pump, too.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Davey wrote:
> >
> > Few months ago, Jeep was at authorised workshop and guy hooked it up
> > on some kind a multitester for Chrysler/Jeep and complete test passed
> > through all of electronic items and found nothing wrong. Guy told me he
> > has no time to drive around with "tester thing" so we couldn't see what
> > happens when it comes to loaded 2250 rpm.
> > Mike, what about this fuel pressure, can it be just a damn pump?
> > Logically, when you pinch return hose, pressure should jump very fast,
> > right?
--
Will Honea
PSI with vacuum off. The fact that it will recover and run at higher
RPM after the stagger suggests that the pump has adequate capacity.
Best thing I can suggest is to check the pressure with the return
pinched first. If that gives 90+ PSI (don't hold it pinched any
longer than necessary) but still reads much below 30 PSI you could
also try a flow check by pinching the return line and opening the
schraeder valve on the fuel rail to pipe the gas to a bucket. I don't
have the number handy, but you will need to see a couple of
liters/minute flow that way. Then go buy a pressure regulator -
your's isn't holding what it's supposed to by a long shot. When my
pump was dying, anything below 20PSI would start it to stuttering.
On Sat, 22 Apr 2006 22:54:50 UTC "L.W.(Bill) ------ III"
<----------@***.net> wrote:
> Hi Davey,
> I would guess it's at least the fuel regulator:
> http://members.***.net/wilsond/Fixes...tml#fuelsystem Pinch
> off the return line and you should have ninety pounds, if not replace
> the pump, too.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Davey wrote:
> >
> > Few months ago, Jeep was at authorised workshop and guy hooked it up
> > on some kind a multitester for Chrysler/Jeep and complete test passed
> > through all of electronic items and found nothing wrong. Guy told me he
> > has no time to drive around with "tester thing" so we couldn't see what
> > happens when it comes to loaded 2250 rpm.
> > Mike, what about this fuel pressure, can it be just a damn pump?
> > Logically, when you pinch return hose, pressure should jump very fast,
> > right?
--
Will Honea
04-22-2006, 11:58 PM
#15
Guest
Posts: n/a
Re: Cherokee fuel press
I'm with Bill on this one. You should have 30-31 PSI with vacuum, 41
PSI with vacuum off. The fact that it will recover and run at higher
RPM after the stagger suggests that the pump has adequate capacity.
Best thing I can suggest is to check the pressure with the return
pinched first. If that gives 90+ PSI (don't hold it pinched any
longer than necessary) but still reads much below 30 PSI you could
also try a flow check by pinching the return line and opening the
schraeder valve on the fuel rail to pipe the gas to a bucket. I don't
have the number handy, but you will need to see a couple of
liters/minute flow that way. Then go buy a pressure regulator -
your's isn't holding what it's supposed to by a long shot. When my
pump was dying, anything below 20PSI would start it to stuttering.
On Sat, 22 Apr 2006 22:54:50 UTC "L.W.(Bill) ------ III"
<----------@***.net> wrote:
> Hi Davey,
> I would guess it's at least the fuel regulator:
> http://members.***.net/wilsond/Fixes...tml#fuelsystem Pinch
> off the return line and you should have ninety pounds, if not replace
> the pump, too.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Davey wrote:
> >
> > Few months ago, Jeep was at authorised workshop and guy hooked it up
> > on some kind a multitester for Chrysler/Jeep and complete test passed
> > through all of electronic items and found nothing wrong. Guy told me he
> > has no time to drive around with "tester thing" so we couldn't see what
> > happens when it comes to loaded 2250 rpm.
> > Mike, what about this fuel pressure, can it be just a damn pump?
> > Logically, when you pinch return hose, pressure should jump very fast,
> > right?
--
Will Honea
PSI with vacuum off. The fact that it will recover and run at higher
RPM after the stagger suggests that the pump has adequate capacity.
Best thing I can suggest is to check the pressure with the return
pinched first. If that gives 90+ PSI (don't hold it pinched any
longer than necessary) but still reads much below 30 PSI you could
also try a flow check by pinching the return line and opening the
schraeder valve on the fuel rail to pipe the gas to a bucket. I don't
have the number handy, but you will need to see a couple of
liters/minute flow that way. Then go buy a pressure regulator -
your's isn't holding what it's supposed to by a long shot. When my
pump was dying, anything below 20PSI would start it to stuttering.
On Sat, 22 Apr 2006 22:54:50 UTC "L.W.(Bill) ------ III"
<----------@***.net> wrote:
> Hi Davey,
> I would guess it's at least the fuel regulator:
> http://members.***.net/wilsond/Fixes...tml#fuelsystem Pinch
> off the return line and you should have ninety pounds, if not replace
> the pump, too.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Davey wrote:
> >
> > Few months ago, Jeep was at authorised workshop and guy hooked it up
> > on some kind a multitester for Chrysler/Jeep and complete test passed
> > through all of electronic items and found nothing wrong. Guy told me he
> > has no time to drive around with "tester thing" so we couldn't see what
> > happens when it comes to loaded 2250 rpm.
> > Mike, what about this fuel pressure, can it be just a damn pump?
> > Logically, when you pinch return hose, pressure should jump very fast,
> > right?
--
Will Honea
04-22-2006, 11:58 PM
#16
Guest
Posts: n/a
Re: Cherokee fuel press
I'm with Bill on this one. You should have 30-31 PSI with vacuum, 41
PSI with vacuum off. The fact that it will recover and run at higher
RPM after the stagger suggests that the pump has adequate capacity.
Best thing I can suggest is to check the pressure with the return
pinched first. If that gives 90+ PSI (don't hold it pinched any
longer than necessary) but still reads much below 30 PSI you could
also try a flow check by pinching the return line and opening the
schraeder valve on the fuel rail to pipe the gas to a bucket. I don't
have the number handy, but you will need to see a couple of
liters/minute flow that way. Then go buy a pressure regulator -
your's isn't holding what it's supposed to by a long shot. When my
pump was dying, anything below 20PSI would start it to stuttering.
On Sat, 22 Apr 2006 22:54:50 UTC "L.W.(Bill) ------ III"
<----------@***.net> wrote:
> Hi Davey,
> I would guess it's at least the fuel regulator:
> http://members.***.net/wilsond/Fixes...tml#fuelsystem Pinch
> off the return line and you should have ninety pounds, if not replace
> the pump, too.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Davey wrote:
> >
> > Few months ago, Jeep was at authorised workshop and guy hooked it up
> > on some kind a multitester for Chrysler/Jeep and complete test passed
> > through all of electronic items and found nothing wrong. Guy told me he
> > has no time to drive around with "tester thing" so we couldn't see what
> > happens when it comes to loaded 2250 rpm.
> > Mike, what about this fuel pressure, can it be just a damn pump?
> > Logically, when you pinch return hose, pressure should jump very fast,
> > right?
--
Will Honea
PSI with vacuum off. The fact that it will recover and run at higher
RPM after the stagger suggests that the pump has adequate capacity.
Best thing I can suggest is to check the pressure with the return
pinched first. If that gives 90+ PSI (don't hold it pinched any
longer than necessary) but still reads much below 30 PSI you could
also try a flow check by pinching the return line and opening the
schraeder valve on the fuel rail to pipe the gas to a bucket. I don't
have the number handy, but you will need to see a couple of
liters/minute flow that way. Then go buy a pressure regulator -
your's isn't holding what it's supposed to by a long shot. When my
pump was dying, anything below 20PSI would start it to stuttering.
On Sat, 22 Apr 2006 22:54:50 UTC "L.W.(Bill) ------ III"
<----------@***.net> wrote:
> Hi Davey,
> I would guess it's at least the fuel regulator:
> http://members.***.net/wilsond/Fixes...tml#fuelsystem Pinch
> off the return line and you should have ninety pounds, if not replace
> the pump, too.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Davey wrote:
> >
> > Few months ago, Jeep was at authorised workshop and guy hooked it up
> > on some kind a multitester for Chrysler/Jeep and complete test passed
> > through all of electronic items and found nothing wrong. Guy told me he
> > has no time to drive around with "tester thing" so we couldn't see what
> > happens when it comes to loaded 2250 rpm.
> > Mike, what about this fuel pressure, can it be just a damn pump?
> > Logically, when you pinch return hose, pressure should jump very fast,
> > right?
--
Will Honea
04-23-2006, 12:41 AM
#17
Guest
Posts: n/a
Re: Cherokee fuel press
The first thing I do with a suspected fuel problem is change the filter,
then blow the old one back into a cup to see what was in it, and how plugged
it was. Shiny metal flakes are usually pump, but some is normal
--
Stupendous Man,
Defender of Freedom, Advocate of Liberty
then blow the old one back into a cup to see what was in it, and how plugged
it was. Shiny metal flakes are usually pump, but some is normal
--
Stupendous Man,
Defender of Freedom, Advocate of Liberty
04-23-2006, 12:41 AM
#18
Guest
Posts: n/a
Re: Cherokee fuel press
The first thing I do with a suspected fuel problem is change the filter,
then blow the old one back into a cup to see what was in it, and how plugged
it was. Shiny metal flakes are usually pump, but some is normal
--
Stupendous Man,
Defender of Freedom, Advocate of Liberty
then blow the old one back into a cup to see what was in it, and how plugged
it was. Shiny metal flakes are usually pump, but some is normal
--
Stupendous Man,
Defender of Freedom, Advocate of Liberty
04-23-2006, 12:41 AM
#19
Guest
Posts: n/a
Re: Cherokee fuel press
The first thing I do with a suspected fuel problem is change the filter,
then blow the old one back into a cup to see what was in it, and how plugged
it was. Shiny metal flakes are usually pump, but some is normal
--
Stupendous Man,
Defender of Freedom, Advocate of Liberty
then blow the old one back into a cup to see what was in it, and how plugged
it was. Shiny metal flakes are usually pump, but some is normal
--
Stupendous Man,
Defender of Freedom, Advocate of Liberty
04-23-2006, 07:13 AM
#20
Guest
Posts: n/a
Re: Cherokee fuel press
Hmm, guys, I told you that my filter is brand new, pressure regulator is
new, filter on pump inlet was clean but pressure still behaves strange.
With or without vacuum line attached, pressure is always only 22 psi.
So, I drove around with gauge connected and mounted inside the cabin.
Happens that in the moment of "stalling" press drops to 18 psi (!?),
then it comes back to my 22 and rises a little bit , thing goes quite fine.
But nothing like in Haynes about 31 to even 39 psi!? Never.
Such a pressure never happens, even if I pinch return line (this is
even pain in the *** because only place where I can pinch return line is
down below the car just before tank. Everywhere else is plastic hose.)
Last thing remaining is stupid fuel pump. Has anyone had any problem
with fuel pump and how these problems look like on those cars?
Yes, one more thing, pressure remains same for a loong period after the
car has been stopped, so I assume that any kind of non-return valves
inside are still in a good mode. And I remember, when I changed filter
(few days ago), pressure rose to just about 24 psi and everything else
remain same.
L.W.(Bill) ------ III wrote:
> Hi Davey,
> I would guess it's at least the fuel regulator:
> http://members.***.net/wilsond/Fixes...tml#fuelsystem Pinch
> off the return line and you should have ninety pounds, if not replace
> the pump, too.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Davey wrote:
>
>> Few months ago, Jeep was at authorised workshop and guy hooked it up
>>on some kind a multitester for Chrysler/Jeep and complete test passed
>>through all of electronic items and found nothing wrong. Guy told me he
>>has no time to drive around with "tester thing" so we couldn't see what
>>happens when it comes to loaded 2250 rpm.
>>Mike, what about this fuel pressure, can it be just a damn pump?
>>Logically, when you pinch return hose, pressure should jump very fast,
>>right?
new, filter on pump inlet was clean but pressure still behaves strange.
With or without vacuum line attached, pressure is always only 22 psi.
So, I drove around with gauge connected and mounted inside the cabin.
Happens that in the moment of "stalling" press drops to 18 psi (!?),
then it comes back to my 22 and rises a little bit , thing goes quite fine.
But nothing like in Haynes about 31 to even 39 psi!? Never.
Such a pressure never happens, even if I pinch return line (this is
even pain in the *** because only place where I can pinch return line is
down below the car just before tank. Everywhere else is plastic hose.)
Last thing remaining is stupid fuel pump. Has anyone had any problem
with fuel pump and how these problems look like on those cars?
Yes, one more thing, pressure remains same for a loong period after the
car has been stopped, so I assume that any kind of non-return valves
inside are still in a good mode. And I remember, when I changed filter
(few days ago), pressure rose to just about 24 psi and everything else
remain same.
L.W.(Bill) ------ III wrote:
> Hi Davey,
> I would guess it's at least the fuel regulator:
> http://members.***.net/wilsond/Fixes...tml#fuelsystem Pinch
> off the return line and you should have ninety pounds, if not replace
> the pump, too.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Davey wrote:
>
>> Few months ago, Jeep was at authorised workshop and guy hooked it up
>>on some kind a multitester for Chrysler/Jeep and complete test passed
>>through all of electronic items and found nothing wrong. Guy told me he
>>has no time to drive around with "tester thing" so we couldn't see what
>>happens when it comes to loaded 2250 rpm.
>>Mike, what about this fuel pressure, can it be just a damn pump?
>>Logically, when you pinch return hose, pressure should jump very fast,
>>right?