Fuel Pump?

[gonzoks]

Need a few opinions.

1992 GT. It takes 3-4 tries to get it started and when its cold it will immediately die. Several times of that and you can keep it running with throttle till its warm and than it will idle on its own - sometimes 30 seconds, sometimes several minutes. Eventually it will always stall on its own.

Been through the checklists and I have some issues to resolve still, some I already have. One thing I noticed yesterday is that the intertia switch has been 'modified' in the past and the wires on it were nearly totally severed on BOTH sides, right up next to the wiring harness plug. No way to fix em - we're talking they were down to 2-3 strands, each, tops. Until I redo the plug, I have it jumpered so I can keep working on the car.

Anyway, when I put a pressure gauge on the valve, I get 4 PSI tops. It will not vary if the car is running or if I just trigger the pump stopped. It immediately bleeds off when I remove power.

I am thinking its the pump (the pressure gauge is good - tested it on another car). But, I only have enough money right now to get this right on the first shot and am concerned buying a pump and finding out its a blocked fuel line, etc.

Thoughts and opinions?

 

[gonzoks]

Disconnected return line and blocked it and tested, still sitting at around 4psi...if this helps.

 

[2002BLGT]

replace the pump

 

[gonzoks]

Thanks!

Anyone else want to weigh in? I just can't imagine what else it might be...

 

[foxstang93notch]

Yeah if you're only pulling 4 PSI on a fuel injected car you are way to low. It should be around 25-30PSI if I remember correctly. I say change the pump. If cost is the issue could try a pull and pay yard and see if you can find one there.

 

[jrichker]

Check fuel pressure:
The local auto parts store may rent or loan a fuel pressure test gauge if you don't have one.
Disconnect vacuum line and check it for evidence of fuel present on the line. If you find fuel, the fuel pressure regulator has failed. Cap the vacuum line and stow it out of the way.
Connect fuel pressure test gauge to Schrader port located just behind the alternator.
Turn the ignition switch on & start the engine. Observe the pressure : you should see 37-41 PSI at idle.
Turn the ignition off, reconnect the vacuum line and disconnect the fuel pressure test gauge. Watch out for squirting gas when you do this.