No fuel pressure on start up
 

I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
(more than 4 hours or so) it starts very hard. I have discovered that if I
cycle the key from off to on and let the fuel pump run and do this a few
times it starts right up.

My theory is that I lose fuel presser when it sits but from where...fuel
pressure regulator? An injector... if so which one? How do I test for this
without just starting to replace parts that may be perfectly good?

I am leaning towards it being a bad injector because sometimes when I start
it it will run rought for a few seconds. I'm thinking that one cylinder is
flooded from the injector leaking fuel into that cylinder. Again, how do I
tell which injector it is without just randomly replacing injectors.

Re: No fuel pressure on start up
 

Look at the spark plugs.
Coasty

"Bri585" <u28292@uwe> wrote in message news:6844dba8f23bd@uwe...
>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a
>while
> (more than 4 hours or so) it starts very hard. I have discovered that if
> I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for
> this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I
> start
> it it will run rought for a few seconds. I'm thinking that one cylinder
> is
> flooded from the injector leaking fuel into that cylinder. Again, how do
> I
> tell which injector it is without just randomly replacing injectors.
>

Re: No fuel pressure on start up
 

Look at the spark plugs.
Coasty

"Bri585" <u28292@uwe> wrote in message news:6844dba8f23bd@uwe...
>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a
>while
> (more than 4 hours or so) it starts very hard. I have discovered that if
> I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for
> this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I
> start
> it it will run rought for a few seconds. I'm thinking that one cylinder
> is
> flooded from the injector leaking fuel into that cylinder. Again, how do
> I
> tell which injector it is without just randomly replacing injectors.
>

Re: No fuel pressure on start up
 

Look at the spark plugs.
Coasty

"Bri585" <u28292@uwe> wrote in message news:6844dba8f23bd@uwe...
>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a
>while
> (more than 4 hours or so) it starts very hard. I have discovered that if
> I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for
> this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I
> start
> it it will run rought for a few seconds. I'm thinking that one cylinder
> is
> flooded from the injector leaking fuel into that cylinder. Again, how do
> I
> tell which injector it is without just randomly replacing injectors.
>

Re: No fuel pressure on start up
 

Put an air conditioning pressure gauge on it to make sure. Usually
it the fuel regulator, bypass check valve is the culprit, unless your
car looks like a diesel starting:
http://members.cox.net/wilsond/Fixes...tml#fuelsystem
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

Bri585 wrote:
>
> I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
> (more than 4 hours or so) it starts very hard. I have discovered that if I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I start
> it it will run rought for a few seconds. I'm thinking that one cylinder is
> flooded from the injector leaking fuel into that cylinder. Again, how do I
> tell which injector it is without just randomly replacing injectors.

Re: No fuel pressure on start up
 

Put an air conditioning pressure gauge on it to make sure. Usually
it the fuel regulator, bypass check valve is the culprit, unless your
car looks like a diesel starting:
http://members.cox.net/wilsond/Fixes...tml#fuelsystem
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

Bri585 wrote:
>
> I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
> (more than 4 hours or so) it starts very hard. I have discovered that if I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I start
> it it will run rought for a few seconds. I'm thinking that one cylinder is
> flooded from the injector leaking fuel into that cylinder. Again, how do I
> tell which injector it is without just randomly replacing injectors.

Re: No fuel pressure on start up
 

Put an air conditioning pressure gauge on it to make sure. Usually
it the fuel regulator, bypass check valve is the culprit, unless your
car looks like a diesel starting:
http://members.cox.net/wilsond/Fixes...tml#fuelsystem
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

Bri585 wrote:
>
> I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
> (more than 4 hours or so) it starts very hard. I have discovered that if I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I start
> it it will run rought for a few seconds. I'm thinking that one cylinder is
> flooded from the injector leaking fuel into that cylinder. Again, how do I
> tell which injector it is without just randomly replacing injectors.

Re: No fuel pressure on start up
 

On Wed, 25 Oct 2006 01:18:52 GMT, the following appeared in
rec.autos.makers.jeep+willys, posted by "Bri585"
<u28292@uwe>:

>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
>(more than 4 hours or so) it starts very hard. I have discovered that if I
>cycle the key from off to on and let the fuel pump run and do this a few
>times it starts right up.
>
>My theory is that I lose fuel presser when it sits but from where...fuel
>pressure regulator? An injector... if so which one? How do I test for this
>without just starting to replace parts that may be perfectly good?
>
>I am leaning towards it being a bad injector because sometimes when I start
>it it will run rought for a few seconds. I'm thinking that one cylinder is
>flooded from the injector leaking fuel into that cylinder. Again, how do I
>tell which injector it is without just randomly replacing injectors.

Check the plugs; the one paired with the leaky injector
should be wet and/or fouled. And if this has been going on a
while it *may* have diluted the oil, so you should probably
change it.
--

Bob C.

"Evidence confirming an observation is
evidence that the observation is wrong."
- McNameless

Re: No fuel pressure on start up
 

On Wed, 25 Oct 2006 01:18:52 GMT, the following appeared in
rec.autos.makers.jeep+willys, posted by "Bri585"
<u28292@uwe>:

>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
>(more than 4 hours or so) it starts very hard. I have discovered that if I
>cycle the key from off to on and let the fuel pump run and do this a few
>times it starts right up.
>
>My theory is that I lose fuel presser when it sits but from where...fuel
>pressure regulator? An injector... if so which one? How do I test for this
>without just starting to replace parts that may be perfectly good?
>
>I am leaning towards it being a bad injector because sometimes when I start
>it it will run rought for a few seconds. I'm thinking that one cylinder is
>flooded from the injector leaking fuel into that cylinder. Again, how do I
>tell which injector it is without just randomly replacing injectors.

Check the plugs; the one paired with the leaky injector
should be wet and/or fouled. And if this has been going on a
while it *may* have diluted the oil, so you should probably
change it.
--

Bob C.

"Evidence confirming an observation is
evidence that the observation is wrong."
- McNameless

Re: No fuel pressure on start up
 

On Wed, 25 Oct 2006 01:18:52 GMT, the following appeared in
rec.autos.makers.jeep+willys, posted by "Bri585"
<u28292@uwe>:

>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
>(more than 4 hours or so) it starts very hard. I have discovered that if I
>cycle the key from off to on and let the fuel pump run and do this a few
>times it starts right up.
>
>My theory is that I lose fuel presser when it sits but from where...fuel
>pressure regulator? An injector... if so which one? How do I test for this
>without just starting to replace parts that may be perfectly good?
>
>I am leaning towards it being a bad injector because sometimes when I start
>it it will run rought for a few seconds. I'm thinking that one cylinder is
>flooded from the injector leaking fuel into that cylinder. Again, how do I
>tell which injector it is without just randomly replacing injectors.

Check the plugs; the one paired with the leaky injector
should be wet and/or fouled. And if this has been going on a
while it *may* have diluted the oil, so you should probably
change it.
--

Bob C.

"Evidence confirming an observation is
evidence that the observation is wrong."
- McNameless

Re: No fuel pressure on start up
 

Just had a similar situation with my 1998 Wrangler. Almost went to the
extreme of replacing the fuel filter. Thats inside the tank and you
have to replace the pump to. Do this first. Take it to autozone and
they will hook diagnostics to it free of charge. $100 at a dealer. Get
the codes and email back. It will more than likely say camshaft sensor.
Just get the codes and let me know. What the hell, it's free.
Bri585 wrote:
> I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
> (more than 4 hours or so) it starts very hard. I have discovered that if I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I start
> it it will run rought for a few seconds. I'm thinking that one cylinder is
> flooded from the injector leaking fuel into that cylinder. Again, how do I
> tell which injector it is without just randomly replacing injectors.

Re: No fuel pressure on start up
 

Just had a similar situation with my 1998 Wrangler. Almost went to the
extreme of replacing the fuel filter. Thats inside the tank and you
have to replace the pump to. Do this first. Take it to autozone and
they will hook diagnostics to it free of charge. $100 at a dealer. Get
the codes and email back. It will more than likely say camshaft sensor.
Just get the codes and let me know. What the hell, it's free.
Bri585 wrote:
> I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
> (more than 4 hours or so) it starts very hard. I have discovered that if I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I start
> it it will run rought for a few seconds. I'm thinking that one cylinder is
> flooded from the injector leaking fuel into that cylinder. Again, how do I
> tell which injector it is without just randomly replacing injectors.

Re: No fuel pressure on start up
 

Just had a similar situation with my 1998 Wrangler. Almost went to the
extreme of replacing the fuel filter. Thats inside the tank and you
have to replace the pump to. Do this first. Take it to autozone and
they will hook diagnostics to it free of charge. $100 at a dealer. Get
the codes and email back. It will more than likely say camshaft sensor.
Just get the codes and let me know. What the hell, it's free.
Bri585 wrote:
> I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
> (more than 4 hours or so) it starts very hard. I have discovered that if I
> cycle the key from off to on and let the fuel pump run and do this a few
> times it starts right up.
>
> My theory is that I lose fuel presser when it sits but from where...fuel
> pressure regulator? An injector... if so which one? How do I test for this
> without just starting to replace parts that may be perfectly good?
>
> I am leaning towards it being a bad injector because sometimes when I start
> it it will run rought for a few seconds. I'm thinking that one cylinder is
> flooded from the injector leaking fuel into that cylinder. Again, how do I
> tell which injector it is without just randomly replacing injectors.

Re: No fuel pressure on start up
 

On Wed, 25 Oct 2006 01:18:52 GMT, "Bri585" <u28292@uwe> wrote:

>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
>(more than 4 hours or so) it starts very hard. I have discovered that if I
>cycle the key from off to on and let the fuel pump run and do this a few
>times it starts right up.
>
>My theory is that I lose fuel presser when it sits but from where...fuel
>pressure regulator? An injector... if so which one? How do I test for this
>without just starting to replace parts that may be perfectly good?
>
>I am leaning towards it being a bad injector because sometimes when I start
>it it will run rought for a few seconds. I'm thinking that one cylinder is
>flooded from the injector leaking fuel into that cylinder. Again, how do I
>tell which injector it is without just randomly replacing injectors.

That exact problem was caused by a defective check valve in the fuel
pump of my 2000 TJ.


-- msosborn at msosborn dot com

Re: No fuel pressure on start up
 

On Wed, 25 Oct 2006 01:18:52 GMT, "Bri585" <u28292@uwe> wrote:

>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
>(more than 4 hours or so) it starts very hard. I have discovered that if I
>cycle the key from off to on and let the fuel pump run and do this a few
>times it starts right up.
>
>My theory is that I lose fuel presser when it sits but from where...fuel
>pressure regulator? An injector... if so which one? How do I test for this
>without just starting to replace parts that may be perfectly good?
>
>I am leaning towards it being a bad injector because sometimes when I start
>it it will run rought for a few seconds. I'm thinking that one cylinder is
>flooded from the injector leaking fuel into that cylinder. Again, how do I
>tell which injector it is without just randomly replacing injectors.

That exact problem was caused by a defective check valve in the fuel
pump of my 2000 TJ.


-- msosborn at msosborn dot com

Re: No fuel pressure on start up
 

On Wed, 25 Oct 2006 01:18:52 GMT, "Bri585" <u28292@uwe> wrote:

>I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
>(more than 4 hours or so) it starts very hard. I have discovered that if I
>cycle the key from off to on and let the fuel pump run and do this a few
>times it starts right up.
>
>My theory is that I lose fuel presser when it sits but from where...fuel
>pressure regulator? An injector... if so which one? How do I test for this
>without just starting to replace parts that may be perfectly good?
>
>I am leaning towards it being a bad injector because sometimes when I start
>it it will run rought for a few seconds. I'm thinking that one cylinder is
>flooded from the injector leaking fuel into that cylinder. Again, how do I
>tell which injector it is without just randomly replacing injectors.

That exact problem was caused by a defective check valve in the fuel
pump of my 2000 TJ.


-- msosborn at msosborn dot com

Re: No fuel pressure on start up
 

That's a good point about it blowing black smoke at start up...it does not.
That leaves me back to the check valve that holds the pressure when the car
sits. Is it in the fuel pressure regulator or is it part of the fuel pump or
is there 2 of them (that doesn't seem right though).

L.W.(Bill) ------ III wrote:
>Put an air conditioning pressure gauge on it to make sure. Usually
>it the fuel regulator, bypass check valve is the culprit, unless your
>car looks like a diesel starting:
>http://members.cox.net/wilsond/Fixes...tml#fuelsystem
> God Bless America, Bill O|||||||O
>mailto:-------------------- http://www.----------.com/
>
>> I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
>> (more than 4 hours or so) it starts very hard. I have discovered that if I
>[quoted text clipped - 9 lines]
>> flooded from the injector leaking fuel into that cylinder. Again, how do I
>> tell which injector it is without just randomly replacing injectors.

--
Message posted via CarKB.com
http://www.carkb.com/Uwe/Forums.aspx/jeep-cars/200610/1

Re: No fuel pressure on start up
 

That's a good point about it blowing black smoke at start up...it does not.
That leaves me back to the check valve that holds the pressure when the car
sits. Is it in the fuel pressure regulator or is it part of the fuel pump or
is there 2 of them (that doesn't seem right though).

L.W.(Bill) ------ III wrote:
>Put an air conditioning pressure gauge on it to make sure. Usually
>it the fuel regulator, bypass check valve is the culprit, unless your
>car looks like a diesel starting:
>http://members.cox.net/wilsond/Fixes...tml#fuelsystem
> God Bless America, Bill O|||||||O
>mailto:-------------------- http://www.----------.com/
>
>> I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
>> (more than 4 hours or so) it starts very hard. I have discovered that if I
>[quoted text clipped - 9 lines]
>> flooded from the injector leaking fuel into that cylinder. Again, how do I
>> tell which injector it is without just randomly replacing injectors.

--
Message posted via CarKB.com
http://www.carkb.com/Uwe/Forums.aspx/jeep-cars/200610/1

Re: No fuel pressure on start up
 

That's a good point about it blowing black smoke at start up...it does not.
That leaves me back to the check valve that holds the pressure when the car
sits. Is it in the fuel pressure regulator or is it part of the fuel pump or
is there 2 of them (that doesn't seem right though).

L.W.(Bill) ------ III wrote:
>Put an air conditioning pressure gauge on it to make sure. Usually
>it the fuel regulator, bypass check valve is the culprit, unless your
>car looks like a diesel starting:
>http://members.cox.net/wilsond/Fixes...tml#fuelsystem
> God Bless America, Bill O|||||||O
>mailto:-------------------- http://www.----------.com/
>
>> I have a '97 Grand Cherokee with the 5.2L V-8. When the car sits for a while
>> (more than 4 hours or so) it starts very hard. I have discovered that if I
>[quoted text clipped - 9 lines]
>> flooded from the injector leaking fuel into that cylinder. Again, how do I
>> tell which injector it is without just randomly replacing injectors.

--
Message posted via CarKB.com
http://www.carkb.com/Uwe/Forums.aspx/jeep-cars/200610/1

Re: No fuel pressure on start up
 

Do you see the regular on the fuel rail:
http://members.cox.net/wilsond/Fixes...-regulator.jpg It
may be in the tank like the newer XJ:
http://www.----------.com/01XJfuelPump.pdf
God Bless America, Bill O|||||||O
mailto:--------------------

"Bri585 via CarKB.com" wrote:
>
> That's a good point about it blowing black smoke at start up...it does not.
> That leaves me back to the check valve that holds the pressure when the car
> sits. Is it in the fuel pressure regulator or is it part of the fuel pump or
> is there 2 of them (that doesn't seem right though).

Re: No fuel pressure on start up
 

Do you see the regular on the fuel rail:
http://members.cox.net/wilsond/Fixes...-regulator.jpg It
may be in the tank like the newer XJ:
http://www.----------.com/01XJfuelPump.pdf
God Bless America, Bill O|||||||O
mailto:--------------------

"Bri585 via CarKB.com" wrote:
>
> That's a good point about it blowing black smoke at start up...it does not.
> That leaves me back to the check valve that holds the pressure when the car
> sits. Is it in the fuel pressure regulator or is it part of the fuel pump or
> is there 2 of them (that doesn't seem right though).

Re: No fuel pressure on start up
 

Do you see the regular on the fuel rail:
http://members.cox.net/wilsond/Fixes...-regulator.jpg It
may be in the tank like the newer XJ:
http://www.----------.com/01XJfuelPump.pdf
God Bless America, Bill O|||||||O
mailto:--------------------

"Bri585 via CarKB.com" wrote:
>
> That's a good point about it blowing black smoke at start up...it does not.
> That leaves me back to the check valve that holds the pressure when the car
> sits. Is it in the fuel pressure regulator or is it part of the fuel pump or
> is there 2 of them (that doesn't seem right though).