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#1
07-15-2004, 06:08 PM
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fuel pressure question
on my 87 gt 5.0 i have a fuel pressure gauge mounted by the windshield and at an idle its at 35psi. isn't that seem a little low, its got the stock fuel pressure regualtor and fuel pump. and when i'm accelorating its goes up to 42psi and when i let off the gas it goes back down to 35psi. what should it be at an idle and durring acceloration? could it be the pump or regulator
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#2
07-15-2004, 07:52 PM
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Re: fuel pressure question
Actually it's perfect.The pressure drops as the engine sees vaccuum, that's how it gets more fuel to the injectors under acceleration. The proper way to test it is to unplug the vac line leading to the regulator at the intake end, then cap the fitting. This simulates WOT. 38-42 PSI is perfectly fine.
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1994 SVT Cobra. 306, Ported GT-40X's, Crane 2031, NX Wet Kit (100 shot for now),TKO 500, TwEECer R/T, and all the bolt-ons..... http://www.cardomain.com/id/mccobra94 1995 F-150 SC/4X4 351W/E4OD, K&N, Custom Exhaust w/Flowmaster. Freedom Isn't Free.
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#3
07-15-2004, 08:09 PM
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Re: Re: fuel pressure question
Quote:
 Stock fuel pressure is 38-39 psi with the vac line off. When the vac line is connected, the FP will drop slightly. So 35 psi seems normal to me.
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[size=1]-1950 Ford Custom, flathead V8
-2013 Ford Flex -1999 Ford F150
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#4
07-15-2004, 08:15 PM
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Re: fuel pressure question
ok i'll check that tomorrow morning... thanks for the help...
-jay-
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#5
07-16-2004, 03:09 PM
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Re: fuel pressure question
ok i checked the pressure with the vac line off at the intake side and pluged it, i get 44psi. is that sound right or a little high?
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