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08-25-2008, 11:38 AM
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#1 (permalink) |
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Argentine 3KGT
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High Fuel Pressure after turning car off?
Just saw this today after i turned the car off. I have an aftermarket fuel pressure gauge installed in the fuel supply line. Pressure while the car is on is around 39 to 40 PSI. After i turn the car off, pressure starts to build up. I dont remember how much it increased but i could guess to about 50 or so PSI. It doesnt happen so quickly, it takes long for it to reach that amount of PSI. After that it slowly decreases until it get to 0 PSI (takes hours). Is this normal?
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 --> 1994 Mitsubishi 3000GT VR4 <--Performance: 4.5" Air Intake W/3SX MAF Adapter, Red Aluminum Pre-Turbo Intake Pipes, Ebay Aluminum Y-Pipe, Greddy Knock-Off Type S BOV, Joe P. Boost Controller, Vacuum Reduction Mod, Clutch Assistant Delete, 3SX EGR Block-Off Plates, NGK Spark Plug Wires, NGK BCP-7ES Plugs Gapped at .36, In-Bay Fuel Pressure Gauge, Gutted Pre-Cats, 3SX Downpipe, Maximal Performance Test Pipe, HHH Datalogger Exterior: 99 Front End Conversion, 3SX HID's 6000K, Red Calipers, 20% Tints Interior: Cianci Fiberglass A-Pillars 52x3, Radio Gauge Pod 52x3, Water Temp Gauge, Oil Pressure Gauge, Oil Temp Gauge, Red/Black Shifter and E-Brake Boot, Pioneer DEH-P6800MP Stereo, 6x9 X-PLOD Rear Speakers Waiting to install: 3SX Braided Clutch Line **95 Base 3KGT TT Converted Part out** PM me |
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08-25-2008, 05:33 PM
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#3 (permalink) |
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is drifting WAY too hard!
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Re: High Fuel Pressure after turning car off?
pretty sure its normal. If everything is working right then pressure should remain in the line for a while so that the car fires up the next time you crank it up.
Pressure likely rises a little after the car is shut off because the FPR no longer has the engine pulling vacuum at idle, so it probably makes 45-50psi right as you shut down, and then the pressure gauge reflects that after a while.
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  96 VR4 w/ Iridium Intercooler |
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