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Username Post: Fuel Pressure test - 7.4l 1996 k2500        (Topic#351952)
Posts: 89
Loc: Carlsbad, Ca
Reg: 02-19-13
07-09-18 08:23 PM - Post#2739516    

In an effort to diagnose my P0300 random misfire code, I checked my fuel pressure. At idle the needle is vibrating between 45-50 psi instead of holding steady. When I turn the key off the pressure drops to 0 with 20 seconds. I have already replaced the fuel pump, and filter. I heard that a slow leak down could be an injector, but a fast loss of pressure could be the regulator.

Before I spend all day diggin back into the engine to get to the FPR, does anyone think I'm on the right track? Could it be anything else?

All replies are much appreciated.

Valued Contributor
Posts: 4140
Age: 36
Loc: wv
Reg: 08-29-12
07-09-18 08:36 PM - Post#2739519    
    In response to 65Longroof

Random misfire is spark, not fuel. My first guess would be a cracked plastic distributor cap.


'88 Chevy K3500, aluminum head roller cam 511inĀ³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap

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