Fuel pump relay question
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Joined: Feb 2018
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From: Detroit mi
Fuel pump relay question
I’ve checked fuel pump fuse it’s good not heating pump turn on when I turn key was told relay could be bad or pump just needs replacing. Before I do the replacing how do I determine if relay is bad
Joined: Dec 2004
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Fuel pump relay question
The ecm sends voltage on the green and white stripe wire for 2 seconds.
You can check this power at the relay and on the pump grey wire. The relay ground cavity f , power to the relay secondary winding cavity a bat + . And cavity e grey wire to the pump. Or depending on your relay type you can switch a fan relay with the pump relay to see if it works. If your not hearing the pump jumper the ops and check for power on the grey wire at the fuel tank connector. If you have power and a good ground the pump is bad.
You can check this power at the relay and on the pump grey wire. The relay ground cavity f , power to the relay secondary winding cavity a bat + . And cavity e grey wire to the pump. Or depending on your relay type you can switch a fan relay with the pump relay to see if it works. If your not hearing the pump jumper the ops and check for power on the grey wire at the fuel tank connector. If you have power and a good ground the pump is bad.
Last edited by Tuned Performance; Jul 9, 2018 at 05:34 PM.
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