fuel pump
12-04-2011, 03:53 PM
#1
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Car: 1991 firebird
Engine: 3.1 l v6 mpi
Transmission: auto
fuel pump
okay so i bought a 91 bird 3.1l v6 the fuel pumps runs great till u turn on the lights or air conditioner the pump is hot wired their is a grey wire crimped to a wire run into fuse box but i have a grey wire that isnt connected to anything and i also have a red i one believe they are all related any ideas guys?????
12-04-2011, 04:46 PM
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Car: 91 Camaro RS
Engine: empty bay (for now)
Transmission: Built T-56
Axle/Gears: 3.42 stock posi disc
Re: fuel pump
the grey wire is the power wire that runs from the main bulkhead connector under the carpet all the way back to the fuel pump. my guess is that car has a fuel pump relay issue and the PO hotwired the pump instead of fixing it.
12-04-2011, 04:49 PM
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Car: 1991 firebird
Engine: 3.1 l v6 mpi
Transmission: auto
Re: fuel pump
ok if i test it what should be the volts/ amp comeing out of it
12-04-2011, 04:53 PM
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Car: 91 Camaro RS
Engine: empty bay (for now)
Transmission: Built T-56
Axle/Gears: 3.42 stock posi disc
Re: fuel pump
the fuel pump relay should have a 12v constant on the orange wire and a 12v on the grey wire when the ecm triggers the relay.
12-04-2011, 04:55 PM
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Car: 1991 firebird
Engine: 3.1 l v6 mpi
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12-04-2011, 05:00 PM
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Car: 91 Camaro RS
Engine: empty bay (for now)
Transmission: Built T-56
Axle/Gears: 3.42 stock posi disc
Re: fuel pump
the red wire is a test circuit to prime the pump. but if the pumps power wire (gray) isnt connected to the circuit, its not gonna do anything.
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12-04-2011, 05:38 PM
#8
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Car: 1991 firebird
Engine: 3.1 l v6 mpi
Transmission: auto
12-04-2011, 05:55 PM
#11
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Car: 91 Camaro RS
Engine: empty bay (for now)
Transmission: Built T-56
Axle/Gears: 3.42 stock posi disc
Re: fuel pump
some people do crazy things to these cars for reasons noone will ever understand. if it works go with it, if it doesnt then we can help you fix whats wrong instead of just rigging it to run.
12-04-2011, 05:59 PM
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Car: 1991 firebird
Engine: 3.1 l v6 mpi
Transmission: auto
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