Fuel pump won't prime with key
06-11-2011, 05:07 PM
#1
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Car: 1987 IrocZ28
Engine: ZZ4 350
Transmission: T5
Axle/Gears: Australian with 3.73
Fuel pump won't prime with key
I have a 1987 iroc Z28 it has a modified 305 tune port injection.
I recently changed the fuel pump and still the car still doesn't start.
It turns over and there is spark at the plugs but it's not starting. I tested the the new pump by using the aldl on the diagnostic linc, but when I use the key the pump still won't prime.
Any help would be greatly appreciated.
I recently changed the fuel pump and still the car still doesn't start.
It turns over and there is spark at the plugs but it's not starting. I tested the the new pump by using the aldl on the diagnostic linc, but when I use the key the pump still won't prime.
Any help would be greatly appreciated.
06-11-2011, 06:19 PM
#2
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Re: Fuel pump won't prime with key
It's possible you've got a flaky ECM (the ECM commands the FP relay at key-on for that 2 second prime). But I'd check the FP relay and it's connections first.
06-11-2011, 07:44 PM
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Car: 1989 IROC
Engine: 5.7
Transmission: 700R4
Axle/Gears: 9 bolt 2:77
Re: Fuel pump won't prime with key
Check your fuse under the hood located between the battery and the radiator,should be 20 amp.
06-11-2011, 11:42 PM
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Car: 1987 IrocZ28
Engine: ZZ4 350
Transmission: T5
Axle/Gears: Australian with 3.73
Re: Fuel pump won't prime with key
Thanks for the advice but it's not the ECM. I have a second ECM and even with it installed the pump still won't prime with the key! But thanks a lot for your suggestion.
06-11-2011, 11:45 PM
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Car: 1987 IrocZ28
Engine: ZZ4 350
Transmission: T5
Axle/Gears: Australian with 3.73
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