LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Fuel Pump Relay ?

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Old Dec 21, 2005 | 04:11 PM
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Fuel Pump Relay ?

Ok guys I installed my walbro pump the other day and I cannot get ny car to start. I traced it down to not getting any power to the pump. The fuel pump relay has no power to it at all when the key is on. I thought the relay was bad but it isnt getting power before there. Any ideas?
Old Dec 21, 2005 | 04:56 PM
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Re: Fuel Pump Relay ?

Anyone?
Old Dec 21, 2005 | 08:13 PM
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Re: Fuel Pump Relay ?

Did everything work prior to installing the pump? Is your SECURITY light on the dash on solid after the key is turned? If so, your VATS system is acting up.
Old Dec 21, 2005 | 08:25 PM
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Re: Fuel Pump Relay ?

No the security light isnt on. Everything wored fine before the pump went out yes. I am not getting any power to the pump or the pump relay
Old Dec 21, 2005 | 08:27 PM
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Re: Fuel Pump Relay ?

Do you have a wiring diagram? If so trace the diagram. First check the fuses in the block.
Old Dec 21, 2005 | 08:37 PM
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Re: Fuel Pump Relay ?

It should not have constant power to pump. It will only prime for a few seconds. I have wiring diagrams for a 93, the 95 should be similar. You should have power on C1 on the relay when the key is on. This is fed from a 15 amp fuse for the ECM IGN Fuse. It is a pink wire. If you do not have power on one side of the contact on the relay, you either have a blown fuse or a open wire somewhere. If you do have power on the one side of relay, you need to find out why the relay is not energizing.

Last edited by smoknta; Dec 21, 2005 at 08:43 PM.
Old Dec 21, 2005 | 09:04 PM
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Re: Fuel Pump Relay ?

I do not have power to it at any time
Old Dec 21, 2005 | 10:49 PM
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Re: Fuel Pump Relay ?

You can always try hooking up the jumper wire in the wiring harness on the pass side about 6" in front of the PCM in the split loom. If you jumper it to 12V, the FP will run. Good for troubleshooting.
Old Dec 21, 2005 | 11:11 PM
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Re: Fuel Pump Relay ?

Originally Posted by joshp007
I do not have power to it at any time
You dont have power to the relay? You should have power on one of the wires(I think it is pink) with the key on. If you do not look for blown fuses.
Old Dec 21, 2005 | 11:11 PM
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Re: Fuel Pump Relay ?

The pink wire going into the pcm?
Old Dec 21, 2005 | 11:15 PM
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Re: Fuel Pump Relay ?

No...on the fuel pump relay. You have a constant 12 volts with the key on, on one of the terminals on the fuel pump relay. Once the relay becomes energized this will feed 12 volts to the pump. I think the 12 volt feed to the fuel pump relay is pink.
Old Dec 21, 2005 | 11:36 PM
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Re: Fuel Pump Relay ?

So if I run a constant 12 volt to the pink wire on the relay I should be good right? At least for testing purposes
Old Dec 22, 2005 | 01:00 AM
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Re: Fuel Pump Relay ?

That will give you 12 Volt to the relay, then you could try and start it to see if the relay is energizing. If you dont have 12 volt to the relay I would start looking for fuses blown. Do you know where the fuel pump relay is?
Old Dec 22, 2005 | 01:18 AM
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Re: Fuel Pump Relay ?

Yea I replaced it today thinking it was bad
Old Dec 22, 2005 | 05:17 AM
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Re: Fuel Pump Relay ?

Originally Posted by joshp007
Yea I replaced it today thinking it was bad
the relay under the dead pedal, right?........................



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