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how fast should the fuel pressure drop?

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Old May 26, 2003 | 03:40 PM
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19WS6T/A91's Avatar
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From: Baton Rouge, LA USA
how fast should the fuel pressure drop?

i checked fuel pressure yesterday and i think i have a leak. after ten minutes i dropped 10 psi. after about 20 minutes i was down to 22 psi when i started at 44. is this normal? would this be a reason my car is missing like crazy?

thanks,

David
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Old May 26, 2003 | 05:19 PM
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3.1EyeCandy's Avatar
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From: Conroe, TX
Car: 1987 GTA
Engine: LS1
Transmission: 4L60e
Did this happen while the car was running or after you turned it off?
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Old May 26, 2003 | 06:44 PM
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19WS6T/A91's Avatar
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From: Baton Rouge, LA USA
after i turned it off, i know its supposed to drop, i just dont know how fast its supposed to drop.
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Old May 27, 2003 | 07:22 AM
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From: Florida
Car: 1987 Black IROC-Z (SOLD)
Never stood there and watched my gage for the time it took to return to zero pressure. Once the power if off it will drop slowly.
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Old May 27, 2003 | 08:27 AM
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Car: 90 Formula
Engine: 355 C.I.
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That is about the normal drop off. What type of spark plug are you running ?
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Old May 27, 2003 | 10:19 AM
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That doesn't sound abnormal. If you had no pressure after 15-20 minutes, I'd be wondering about injectors.
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