96 GMC Suburban Fuel Pressure problem

1675 Views 6 Replies 5 Participants Last post by Motor City Rick, Jan 17, 2019

djosh611

Discussion Starter · Jan 28, 2018

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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Motor City Rick

· #7 · Jan 17, 2019

PyRex,

The FPR attaches to full manifold vacuum. Somewhere on that intake manifold or by the throttle plate area you'll see an unused vacuum port with has no hose on it. Make sure it's "full vacuum", ...not "ported" vacuum.

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