Fuel Pressure
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HT4100 4.1, 4.5, 4.9 Discussion, Fuel Pressure in Cadillac Engine Technical Discussion; So i have been dealing with a a problem of my 91 dev. stumbleing. so i did the egr the ...
  1. #1
    WChrisEG is offline Cadillac Owners Member
    Join Date
    Apr 2006
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    1

    Fuel Pressure

    So i have been dealing with a a problem of my 91 dev. stumbleing. so i did the egr the cat and the o2 check the fuel pressure with key turned(42psi) running it is at about 38 when i give it gas it drops to about 32.BUT here isthe question if i leave the gage hooked up for about 15 min the pressure dropped to about 20psi(note the key is OFF NOT ON) is that a sign of a stuck injector inturn leaking fuel into the cylinder and causing the stumbling.. the stumbling goes away after a bit of driving...it is not throwing any codes at all no codes store either

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with floor shift)
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    Jun 2004
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    Woodstock Ill.
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    Re: Fuel Pressure

    Either that or a leaky check valve and it's running back into the tank. You'll have to pull the fuel rail and turn the key on (DO NOT crank the engine) and look for a leaky injector.

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