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96 GMC Suburban Fuel Pressure problem

1673 Views 6 Replies 5 Participants Last post by  Motor City Rick
I have a 1996 GMC suburban 2500 7.4 vortec that has a miss at idle. I have replaced the FPR, spark plugs, wires, Cap, and rotor and its still misses. when I connect my pressure gauge and turn the key on it jumps to around 45psi and holds but when I turn it off it falls back to around 25psi. could it be a faulty FPR or if it was the rubber hose on the fuel pump shouldn't I hear the gas running back in the tank? any help would be greatly appreciated.
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I was having a no start issue in my 99 k2500/7.4. The truck has run rough (sometimes) and had a slight miss on cylinders 5. It has also been hard to start when warm after sitting for 20 minutes or so. I took off my intake and found that I had three leaking injectors, plus those cylinders' spark plugs smelled like they were SOAKED even though it had been about two weeks since I last attempted to start the engine. I took the injectors to Mr. Injector here in Coeur d' Alene and they tested them, my discs are bad so I will be buying a new set of injectors along with fuel rail, clips, fuel pressure regulator and electrical connectors. Guess I should have replaced them back when I did the engine R&R.

One thing that was different with my situation is that the fuel pressure was 52 but bled down within a couple minutes to 20ish.

One other thing was that the FPR was not hooked up to a vacuum line, I can't find where it was connected, and the manuals I have don't really show me what/where it hooks up to.
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