LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

New motor just intalled, now no fuel pressure

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Old 12-12-2006, 09:33 PM
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New motor just intalled, now no fuel pressure

I was hoping to have a running car today, but the fuel pump is not turning on. As far as we can tell, all the fuses and relays are fine, as well as everything is plugged in properly. Normally, when you turn the key 3/4 of the way, the fuel pump engages, but it isnt doing that now. The car sat for a year in extreme desert heat with a half gallon of gas; did the gas clog the pump? Is there anything else I could try?
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Old 12-12-2006, 09:35 PM
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I have a feeling you will be dropping your tank soon. I bet your pump went from sitting. 1 year and bad gas is rough on a fuel system.
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Old 12-12-2006, 09:38 PM
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Have you confirmed the pump itself is getting power?
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Old 12-12-2006, 10:00 PM
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Apply 12V directly to the fuel pump (can get access to the fuel pump wires under the car just above the axle) andd see if the pump runs. This will point to, or eliminate the wiring as your issue.
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Old 12-13-2006, 09:15 AM
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Man, I had a similar situation but my fuel pump hose popped off the top of the pump after my engine install. We thought something was wrong with the motor until we looked at the logs. I guess after sitting for a while, the pump blew it off when we tried to wake the car back up after the engine install.
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Old 12-13-2006, 03:59 PM
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Unless you like dropping the rear end the cutout method is great. There are several threads about it. This can be used to check it over and over with little trouble.
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