Fuel System Problems

[steveric05]

My Bravada seems to be having a fuel system problem.... Last week leaving home for work, it was hard to start (everything apeared normal, good cranking speed, no waring lights) I cranked for about 5 (longer than usual) seconds and it didn't start. I let it sit for a couple of minutes and triied again, it crank'd longer than usual again, but slowly started. Drove to work with no indications of any problems, park'd. After work it was again hard to start, it took almost 20 mins of triing to start it, let it sit, try to start, let it sit, before it start'd again. From there I drove it to a parking spot that I left it at all weekend (where it had to be towed from!) and it would not start. Before towing I did dump gas down the throttle body and it started and ran for a few seconds and quit.....

OK so here's my questions:
- What should the fuel pressure be? I'm using a pressure gauge at the schader valve behind the air intake. Before changing the fuel filter I had about 38 psi, after the filter about 40-42 psi, doing a static key on, engine off test.
- Where on the fuel manifold/rail is the fuel pressure regualtor, and what is the best way to test it?

Thanks!

[old_master]

Your fuel pressure is too low. Key on, engine off, fuel pump running, pressure must be 60psi to 66psi. After 2 to 3 seconds, the pump will shut off, pressure must remain above 55psi for 3 to 5 minutes. This test checks many things in the fuel delivery system all at one time. If either part of this test fails, further diagnosis is necessary to determine what the problem is. Post your results.

[steveric05]

Fuel pump was the problem! $260 for the pump and about 5 hours to do the job. I dropped the spare tire, that helped ALOT, also be careful of the front vent fitting. I forgot that fitting was there until I had the tank 99% out of the vehicle and it was hanging by the hose and fitting, THANKFULLY it did not break off (since it appears to be plastic welded into the tank), it did however crack a little bit and I found a fuel resistant adhesive that I putty'd it up with. Thanks for the help!!! and I hope my posting helps someone else!

[Chris Stewart]

Thanks for the update, it'll help someone down the road.