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Please Help! Fuel Pump Not Working

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Old 08-16-2015, 10:17 PM   #1
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Car: 1989 Firebird
Engine: 305 TBI

Please Help! Fuel Pump Not Working

Hello everyone, I have a 1989 Firebird 305 TBI, I'm having issues with the fuel pump, the car stalled a few times, and now it will not start at all, the fuel pump does not prime when the key is turned and the gas gauge sais it's over full, if I'm correct that means there's no power getting to the pump and sending unit? I replaced the fuel pump, the fuel relay (If the relay in the picture is the right one) I noticed that the relay and plug are a bit burnt. Also I followed the ground wire from the pump and put a new end on it as well as a new bolt because they were pretty rusty. Still no luck with getting the pump to prime. About a month before this problem started I have a PROM Chip burnt to bypass VATS, not sure if that would have anything to do with it? Any help would be greatly appreciated as this car is my daily driver!

This is the relay that is burnt, is his the correct one for the fuel pump?




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Old 08-18-2015, 07:07 PM   #2
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Re: Please Help! Fuel Pump Not Working

That looks like the correct relay for a TBI.

Have to tried jumping the relay to see if you can get the pump to come on? I'm afraid I can't advise on which wires to bridge, I'm only familiar with TPI relays.
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Old 08-18-2015, 09:24 PM   #3
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Re: Please Help! Fuel Pump Not Working

Curious as to where you bought your relay ?
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Old 08-19-2015, 10:18 PM   #4
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Re: Please Help! Fuel Pump Not Working

Quote:
Originally Posted by FalconZ28 View Post
That looks like the correct relay for a TBI.

Have to tried jumping the relay to see if you can get the pump to come on? I'm afraid I can't advise on which wires to bridge, I'm only familiar with TPI relays.
I haven't tried that yet, would that be worth doing even with the new relay?
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Old 08-19-2015, 10:18 PM   #5
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Re: Please Help! Fuel Pump Not Working

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Originally Posted by djmarch View Post
Curious as to where you bought your relay ?
I purchased the relay from Lordco Autoparts
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Old 08-19-2015, 11:25 PM   #6
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Re: Please Help! Fuel Pump Not Working

Could be the small fuse on the driver's side just behind the charcoal canister area. Had a similar issue there. When I tested my relay, I just used a test light to find the one that had 12v power and then jumped every wire one by one until the fuel pump came on. However, I'm only telling you what I did and not telling you to go and give every wire on that relay 12v, I'm just saying that is how I did it. I'm sure you can find a wiring diagram for the engine on the austinsthirdgen site. I only did what I did because I was in the moment and working on the vehicle and did not want to stop just to go and research , however that does save problems and future money
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Old 08-19-2015, 11:29 PM   #7
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Re: Please Help! Fuel Pump Not Working

Also, when I ran TPI my relay had 5 wires going to it , this could differ but someone should verify that is the correct relay you are replacing
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Old 08-20-2015, 12:25 AM   #8
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Re: Please Help! Fuel Pump Not Working

Thanks for your input! what fuse are you talking about? Not familiar with a Charcoal Canister!
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Old 08-21-2015, 10:27 PM   #9
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Re: Please Help! Fuel Pump Not Working

Pretty sure my relay has 5 wires as well. Does the bigger black wire with a red stripe and the bigger red wire from the relay end up near the battery? The black leading to a fuse, and the red leading to a fuseable link looking piece of wire ?
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Old 08-21-2015, 11:08 PM   #10
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Re: Please Help! Fuel Pump Not Working

My mistake the relay has 4 wires. What setting do I use on my multimeter to check if there's power to the pump and on the pumps power wire at the relay
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Old 07-21-2016, 02:38 PM   #11
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Re: Please Help! Fuel Pump Not Working

Hello Glowsok, did you ever figuer out you problem i am having same issue with my 89 bird?
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