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Author Topic: Quick Fuel Pressure Drop  (Read 1870 times)

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Offline Scoobum

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Quick Fuel Pressure Drop
« on: June 09 2013, 07:16:25 PM »
Got a GN here where the fuel pressure drops to zero almost instantly when you turn the key off. Pump is new from Racetronix. Injectors are 55's...unsure of age. Fire away guys.
« Last Edit: June 09 2013, 07:25:03 PM by Scoobum »
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Offline earlbrown

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Re: Quick Fuel Pressure Drop
« Reply #1 on: June 09 2013, 07:55:23 PM »
stuck injector, fuel pulsator, leaky hangar fuel pump hose, or leaky check valve in the pump.
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'87 GN - 4.2L SFI Turbocharged innercooled V6 - Chrome valve covers - supra pump - 14" K&N - 52mm throttlebody - rocker shaft supports -  1/2 intake spacer - TB coolant bypass - 3" ATR exhaust tip - Alum intake pipe - NOS timing cover - chip - relocated charcoal canister - CR42's - stock

Offline Scoobum

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Re: Quick Fuel Pressure Drop
« Reply #2 on: June 09 2013, 07:57:46 PM »
Thanks Earl.
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Offline Steve Wood

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Re: Quick Fuel Pressure Drop
« Reply #3 on: June 09 2013, 08:13:21 PM »
http://www.vortexbuicks-etc.com/fuel_pressure_diagnosis.htm

somewhere on my site, there should be a write up describing clamping off the two rubber hoses at the front of the car to isolate the problem but I don't see it...anyway, the trouble tree in the link above tells you what to do
« Last Edit: June 09 2013, 08:32:08 PM by Steve Wood »
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A lot of broken parts does not make you a racer; it makes you a slow learner.
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