2000 gmc jimmy with a fuel problem?

[soccermonkey7]

i have a 2000 gmc jimmy that will run well fo a while then shut down i have checked for fuel pressure it is ok but yet when i spray a flamable down the throttle body it will again start and mos of the time i can keep it running any ideas

 

[epiphaknee]

I would look at the fuel pump and injectors if you have them. If you have the injectors I would consider the fuel pressure regulator.

However, needing to add some "combustion" would lead me to the fuel pump not creating enough psi at start-up.

 

[QuadFreak400ex]

try some fuel injector cleaners. and if the fuel pump isn't creating enough psi at start-up like epiphaknee said try turning the key on so the radio etc turn on (not the car) turn the key back to the off position after a couple seconds then repeat a few times. this should build fuel pressure. this helped me get a little more time outta my fuel pump before i replaced it

 

[Molson02536]

You may be weak on fuel pressure . even a couple of lbs low on a cold start will cause a no start.
Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems.
one test is to give it a squirt of carb cleaner not starting fluid. If it starts then you have a fuel pressure problem.
Run the full fuel pressure test and post back pressures.
Here is the guide lines on testing.
Hard to start cold.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
Do not leave home without it.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak.
Post back fuel pressure readings.