Question about 1989 Pontiac Firebird
Check the Fuel Pump and Multiport fuel injector fuse that is located near your positive battery terminal. Also check the electrical connector on the fuel pump itself.The fuse, relay and eletrical connector on the pump are the main direct eletrical connections for your fuel system. It's possible your fuel pump could have failed as well.
There is an interesting article :-
If your ECU is malfunctioning, it can prevent your fuel pump from operating. Though if you tried start up your fuel pump by directly connecting it to the battery, and you didn't hear it kick on, than your problem could very well be a bad fuel pump. Check those items and you should find your problem.
There is one more reply from an expert ( For most of the old models ) :-
There should be some oversized fuses in a fuse block under the hood. Often they are on the firewall, behind a cover or near the battery in a fuse box.
It's all just a guess since there isn't enough information to figure out what's really going on.
There is a "lock out" in the control module. Disconnect the battery. disconnect the control module. Wait. reconnect the control module. reconnect the battery. Voltages should be correct.
Any further help, let me know.
Hope i helped you.
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Posted on Jun 27, 2009
On the tuned port 305 there is an inline 20amp fuse that is hot at all times. It is on the Orange power feed circuit to the fuel pump relay, oil sending unit and other input sensors for engine control.
The fuse holder should be located near the battery or fuel pump relay, I don't remember exactly.
Below is the wiring diagram for you year and model Trans Am. It is "cropped" the full version is too big.
Good luck, let me know.
Posted on Jul 15, 2009
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Posted on Jan 02, 2017
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