Fuel Pump Electrical Issue
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5th Wheeling
Joined: Feb 2023
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Fuel Pump Electrical Issue
1996 f150 4.9
Truck sat before I got it, recently put a rebuilt computer in the truck as well as a distributor in chase of spark. Now I have spark, but the fuel pump does not prime or run at all when the key is turned on. If you jump the 86 and 87 wires with the fuel pump relay removed, the fuel pump will run when the key is on. What could be the cause of this?
Edit: fuel pump was also replaced
Truck sat before I got it, recently put a rebuilt computer in the truck as well as a distributor in chase of spark. Now I have spark, but the fuel pump does not prime or run at all when the key is turned on. If you jump the 86 and 87 wires with the fuel pump relay removed, the fuel pump will run when the key is on. What could be the cause of this?
Edit: fuel pump was also replaced
Last edited by Jakester12; Feb 10, 2023 at 07:30 PM. Reason: Forgot
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5th Wheeling
Joined: Feb 2023
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no but the relay clicks when you turn the truck on, and the horn also doesn’t work, even though it’s relay seems to be good as well. If you jump the horn relay 30 and 87 the horn sounds.
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5th Wheeling
Joined: Feb 2023
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yes it has plenty of fuel pressure, I can bleed a schrader valve near the fuel rail and get good fuel. Fuel tank was flushed very recently too
Fleet Owner
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5th Wheeling
Joined: Feb 2023
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ok I’ll try that tomorrow. I was out of town today
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5th Wheeling
Joined: Feb 2023
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That ended up being the issue, the truck runs like a top now. Thank you all!
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Stuart Grantham
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