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Old 02-17-2004   #1 (permalink)
stangGT95 is offline Apprentice

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Default By-pass FMU?

I'm curious about what if I didn't use the FMU and ran a vacuum line from the FPR to the boost side of a Kenne Bell. Would that raise the fuel pressure when under boost? If so, what would happen to fuel pressure when not under boost...would the regulator be blown shut? I had notice that when I spun the blower pulley that air would come out of the "nipple" I had planned on connecting to the FPR. Any input would be appreciated.
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Old 02-17-2004   #2 (permalink)
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I scratch my head at this one... sorry.
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Old 02-17-2004   #3 (permalink)
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I ask because the guy I got the blower off of said he had his FPR vacuum hose attached to one of the "nipples" on the KB intake that goes from the blower to lower intake (not one from intake to blower). So he was running boost w/out the FMU. I'll ask him again but I don't think he was running larger injectors.
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95 GT w/ AODE, TransGo shift kit, and trans cooler, SpeedCal, underdrive pulleys, stock MAF w/ center post removed, 70mm TB, digital A/F gauge, electric boost/fuel pressure gauge, 6# Kenne Bell w/ Flowzilla intake, ported GT-40 lower, 1 5/8" unequal headers, 2 1/2" ProChamber, 2 1/2" Borla catback exhaust, and 3.55's. Chrome Cobra R's. Cobra RR hood, double Saleen wing, billet grill, chrome strut tower brace and radiator hoses.
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Old 02-26-2004   #4 (permalink)
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If you hook the vacuum/boost line up to the FPR, it will function normally, i.e. ignore boost and decrease fuel pressure under vacuum.

I tried running the car without the FMU, and it runs rich at idle, and lean at WOT. The FPR only adds/subtracts about 6-8 psi of fuel pressure.

Not enough...sorry!
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