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Fuel system
1991 Pontiac Firebird

Fuel system

(1991 Pontiac Firebird)
i put a new fuel pump on my 1991 firebird and i still am not getting any fuel what all is involed in the fuel system besides the relay.
2 answers & 0 comments
Popular Answer
on June 20, 2010
There is a Crank Sensor that has to be 'seen' by the Engine Computer, or it will not turn on the fuel pump, there is also a low oil fuel pump cut off switch on the oil pan, ( on some Firebirds of this era ) so if that is defective it will not allow the fuel pump relay to energize the fuel pump. Best to check for codes, do a data scan of your ECM to see what is working and what is not when you are cranking the Engine. Do you have Spark and Injector pulse? If not, this could also be the Crank Sensor or RPM Sensor.
here is a link to the Repair Information for your car:
http://bit.ly/mitchell_repair_manuals_online Go over the fuel system schematic carefully.

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General Diagnosis
$88 - $111 Learn More
on June 20, 2010
There is a Crank Sensor that has to be 'seen' by the Engine Computer, or it will not turn on the fuel pump, there is also a low oil fuel pump cut off switch on the oil pan, ( on some Firebirds of this era ) so if that is defective it will not allow the fuel pump relay to energize the fuel pump. Best to check for codes, do a data scan of your ECM to see what is working and what is not when you are cranking the Engine. Do you have Spark and Injector pulse? If not, this could also be the Crank Sensor or RPM Sensor.
here is a link to the Repair Information for your car:
http://bit.ly/mitchell_repair_manuals_online Go over the fuel system schematic carefully.

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we have an 88 FB; there's a fuse for the fuel pump near the passenger side dash - we had the same issues/replaced parts - got frustrated. We hunted down the dang fuse & replaced it. Works like a champ now!
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