fuel pump not priming any more??
04-20-2007, 12:58 PM
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Car: 1991 Pontiac Firebird
Engine: 383 LT1
Transmission: built 700r4 and fuddle 3500stall
Axle/Gears: 4th gen 3.42 auburn
fuel pump not priming any more??
so i have a 91 bird did a swap from the 305tbi to a 350carb. everything was working fine and the car is still running but i noticed that the pump isnt priming any more. after i did the carb swap it was still priming but in the last week or so i noticed its not. is the pump going out or what?
04-20-2007, 01:00 PM
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Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: fuel pump not priming any more??
It won't prime without a working ECM.
04-20-2007, 02:54 PM
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Car: 1991 Pontiac Firebird
Engine: 383 LT1
Transmission: built 700r4 and fuddle 3500stall
Axle/Gears: 4th gen 3.42 auburn
Re: fuel pump not priming any more??
the ecm is still hooked up and it was priming before... i changed the engine in july and it just now quit.
04-20-2007, 03:23 PM
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Car: 88' IROCZ
Engine: 388 TPI Motown 350 Race block
Transmission: 700R4
Axle/Gears: 2.77
Re: fuel pump not priming any more??
Pull the FP relay off and see if it will start.
04-20-2007, 03:39 PM
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Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: fuel pump not priming any more??
Maybe a bad fuel pump relay. It doesn't really matter though, if you've done the swap properly you've changed the distributor, so the ECM never gets reference pulses to turn the fuel pump on after priming. The oil pressure switch is turning the pump on after the pressure rises.
04-20-2007, 05:34 PM
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Car: 1991 Pontiac Firebird
Engine: 383 LT1
Transmission: built 700r4 and fuddle 3500stall
Axle/Gears: 4th gen 3.42 auburn
Re: fuel pump not priming any more??
just wanted to make sure it wasnt a sign that it was going out.
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