Re: 96 Grand Cherokee Stalling
 

it should hold no less that 10 psi over nite if it goes to big fat 0 there is a problem

DougW wrote:

> dougguitar wrote:
> > billy ray wrote:
> >> How long will it hold fuel pressure?
> >>
> >> Leaking fuel injectors will make restart difficult....... do you get
> >> an initial puff of black smoke when it does start?
> >>
> >
> > No, no black smoke on a restart. I haven't timed it, but it holds fuel
> > pressure pretty well. At least 15 or 20 minutes.
>
> It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> be shot. When you take the vac line off see if there is gas dribbling out.
>
> --
> DougW

Re: 96 Grand Cherokee Stalling
 

it should hold no less that 10 psi over nite if it goes to big fat 0 there is a problem

DougW wrote:

> dougguitar wrote:
> > billy ray wrote:
> >> How long will it hold fuel pressure?
> >>
> >> Leaking fuel injectors will make restart difficult....... do you get
> >> an initial puff of black smoke when it does start?
> >>
> >
> > No, no black smoke on a restart. I haven't timed it, but it holds fuel
> > pressure pretty well. At least 15 or 20 minutes.
>
> It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> be shot. When you take the vac line off see if there is gas dribbling out.
>
> --
> DougW

Re: 96 Grand Cherokee Stalling
 

it should hold no less that 10 psi over nite if it goes to big fat 0 there is a problem

DougW wrote:

> dougguitar wrote:
> > billy ray wrote:
> >> How long will it hold fuel pressure?
> >>
> >> Leaking fuel injectors will make restart difficult....... do you get
> >> an initial puff of black smoke when it does start?
> >>
> >
> > No, no black smoke on a restart. I haven't timed it, but it holds fuel
> > pressure pretty well. At least 15 or 20 minutes.
>
> It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> be shot. When you take the vac line off see if there is gas dribbling out.
>
> --
> DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar@yahoo.com wrote:
> DougW wrote:
>> It should hold pressure for over 4-5 hours. Given this and your
>> 45psi for fuel pressure I'm starting to think the regulator might be
>> shot. When you take the vac line off see if there is gas dribbling
>> out.
>>
>> --
>> DougW
>
> OK, I timed it. After 4 minutes, the pressure had dropped from around
> 49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
> add to my fun, the 96 GC does not have the fuel pressure regulator
> attached to the fuel rail: it's built into the fuel pump. @#$%
> There's just a direct connect fuel line going to the fuel rail.
>
> Will a regulator fail in this intermittent way? If that's the case,
> then I have to pony up the $300 plus for a new fuel pump. Sure wish I
> could be sure before I make the financial plunge.

Hard to tell, the 96 made a lot of changes and my books are only good
up to the 95. 49 psi might be normal. Still though I thought pressure
was supposed to be maintained longer than that. I'd suggest calling a
dealership and asking if a mechanic could look that up for you. It's
worth a shot.

I don't think it is your fuel pump. Pumps and pressure regulators
usually fail to the low pressure side and what you get is a lack of
power at wide-open-trottle or even pinging.

--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar@yahoo.com wrote:
> DougW wrote:
>> It should hold pressure for over 4-5 hours. Given this and your
>> 45psi for fuel pressure I'm starting to think the regulator might be
>> shot. When you take the vac line off see if there is gas dribbling
>> out.
>>
>> --
>> DougW
>
> OK, I timed it. After 4 minutes, the pressure had dropped from around
> 49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
> add to my fun, the 96 GC does not have the fuel pressure regulator
> attached to the fuel rail: it's built into the fuel pump. @#$%
> There's just a direct connect fuel line going to the fuel rail.
>
> Will a regulator fail in this intermittent way? If that's the case,
> then I have to pony up the $300 plus for a new fuel pump. Sure wish I
> could be sure before I make the financial plunge.

Hard to tell, the 96 made a lot of changes and my books are only good
up to the 95. 49 psi might be normal. Still though I thought pressure
was supposed to be maintained longer than that. I'd suggest calling a
dealership and asking if a mechanic could look that up for you. It's
worth a shot.

I don't think it is your fuel pump. Pumps and pressure regulators
usually fail to the low pressure side and what you get is a lack of
power at wide-open-trottle or even pinging.

--
DougW

Re: 96 Grand Cherokee Stalling
 

dougguitar@yahoo.com wrote:
> DougW wrote:
>> It should hold pressure for over 4-5 hours. Given this and your
>> 45psi for fuel pressure I'm starting to think the regulator might be
>> shot. When you take the vac line off see if there is gas dribbling
>> out.
>>
>> --
>> DougW
>
> OK, I timed it. After 4 minutes, the pressure had dropped from around
> 49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
> add to my fun, the 96 GC does not have the fuel pressure regulator
> attached to the fuel rail: it's built into the fuel pump. @#$%
> There's just a direct connect fuel line going to the fuel rail.
>
> Will a regulator fail in this intermittent way? If that's the case,
> then I have to pony up the $300 plus for a new fuel pump. Sure wish I
> could be sure before I make the financial plunge.

Hard to tell, the 96 made a lot of changes and my books are only good
up to the 95. 49 psi might be normal. Still though I thought pressure
was supposed to be maintained longer than that. I'd suggest calling a
dealership and asking if a mechanic could look that up for you. It's
worth a shot.

I don't think it is your fuel pump. Pumps and pressure regulators
usually fail to the low pressure side and what you get is a lack of
power at wide-open-trottle or even pinging.

--
DougW

Re: 96 Grand Cherokee Stalling
 

You have a second regulator on the engine for the return line I think.

How good is the body to engine or frame to engine or battery to the body
ground strap? One of those with a bad connection can cause your
symptoms.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

dougguitar@yahoo.com wrote:
>
> DougW wrote:
> > It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> > be shot. When you take the vac line off see if there is gas dribbling out.
> >
> > --
> > DougW
>
> OK, I timed it. After 4 minutes, the pressure had dropped from around
> 49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
> add to my fun, the 96 GC does not have the fuel pressure regulator
> attached to the fuel rail: it's built into the fuel pump. @#$% There's
> just a direct connect fuel line going to the fuel rail.
>
> Will a regulator fail in this intermittent way? If that's the case,
> then I have to pony up the $300 plus for a new fuel pump. Sure wish I
> could be sure before I make the financial plunge.
>
> By the way, the coil I used was regular old AutoZone Duralast.
>
> Doug B.

Re: 96 Grand Cherokee Stalling
 

You have a second regulator on the engine for the return line I think.

How good is the body to engine or frame to engine or battery to the body
ground strap? One of those with a bad connection can cause your
symptoms.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

dougguitar@yahoo.com wrote:
>
> DougW wrote:
> > It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> > be shot. When you take the vac line off see if there is gas dribbling out.
> >
> > --
> > DougW
>
> OK, I timed it. After 4 minutes, the pressure had dropped from around
> 49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
> add to my fun, the 96 GC does not have the fuel pressure regulator
> attached to the fuel rail: it's built into the fuel pump. @#$% There's
> just a direct connect fuel line going to the fuel rail.
>
> Will a regulator fail in this intermittent way? If that's the case,
> then I have to pony up the $300 plus for a new fuel pump. Sure wish I
> could be sure before I make the financial plunge.
>
> By the way, the coil I used was regular old AutoZone Duralast.
>
> Doug B.

Re: 96 Grand Cherokee Stalling
 

You have a second regulator on the engine for the return line I think.

How good is the body to engine or frame to engine or battery to the body
ground strap? One of those with a bad connection can cause your
symptoms.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

dougguitar@yahoo.com wrote:
>
> DougW wrote:
> > It should hold pressure for over 4-5 hours. Given this and your 45psi for fuel pressure I'm starting to think the regulator might
> > be shot. When you take the vac line off see if there is gas dribbling out.
> >
> > --
> > DougW
>
> OK, I timed it. After 4 minutes, the pressure had dropped from around
> 49 psi to about 35 psi. After 12 minutes, it had dropped to 20 psi. To
> add to my fun, the 96 GC does not have the fuel pressure regulator
> attached to the fuel rail: it's built into the fuel pump. @#$% There's
> just a direct connect fuel line going to the fuel rail.
>
> Will a regulator fail in this intermittent way? If that's the case,
> then I have to pony up the $300 plus for a new fuel pump. Sure wish I
> could be sure before I make the financial plunge.
>
> By the way, the coil I used was regular old AutoZone Duralast.
>
> Doug B.

Re: 96 Grand Cherokee Stalling
 

philthy wrote:
> did u replace the cap and rotor too?

I replaced the cap today. It didn't help. I have not replaced the
rotor.

Doug B.