When I turn key to on,fuel pressure is 40 psi,check engine light goes off and pressure drops to zero almost instantly.I put a new pressure regulator on,and it does the same thing and won't stay running.I took the return hose off and turn key on,gas flows out of regulator.My question is;is fuel supposed to flow out like this?Car will start,run about 3 or 4 seconds and die.Can anyone figure this out?

 

test the main relay


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Already replaced .master relay.

 

Any one else have any thoughts on the regulator?

 

it's physically impossible for the fuel pressure to bleed to 0 within a couple seconds unless there's a leak

Can you confirm for a fact that that's exactly what's happening ? Something doesn't sound right.

 

Allrighty then,car starts,runs about 5 seconds and dies.With fuel pressure gauge hooked up,prime 2 seconds ,40psi,check engine light goes out and pressure drops to 0. All related parts have been replaced.(I know it's not the way to do it) I also know I have a leak in the system,but I can't locate it.Could injectors cause that kind of sudden loss?Thank You

 

Pull the spark plugs and look for one that is a lot darker than the others. That could point to a leaking/sticking injector.

It might smell more like fuel than the others as well.