84/85 Fuel pump relay trick...

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May 30, 2006 | 08:09 AM

#26

cdrad51

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Joined: Nov 2003

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From: The Net

Quote:

Originally Posted by wackyracer

Without a relay, you may as well connect the f/p wire directly to a battery.

Yeah I heard some people have done that too.

May 30, 2006 | 10:32 AM

#27

Pele

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From: Behind a workbench, repairing FC Electronics.

Quote:

Originally Posted by samtuck

wacky, how exactly does the relay provide protection? I understand how a relay works but I’ve never heard of it being used as any sort of backup or fuse type component

I just unplugged my relay and installed the jumper to the plug, the dead relay is still hanging.

If you wreck and are unconscious or trapped in the car and a fuel line breaks, the engine will stop. With the relay, the fuel pump will also stop, keeping fuel in the tank...

If you bypass said relay, the fuel pump will continue to run, pumping fuel all over the place.

May 30, 2006 | 11:51 PM

#28

IanS

Ricer

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From: Washington, Iowa

Quote:

Originally Posted by Pele

So what about all of us running a 79-83 car? If the ignition key doesnt get shut off, the pump still runs. The only way it would stop is if we flipped over... Oops I bypassed that too. DAMMIT!

May 31, 2006 | 12:51 AM

#29

Kentetsu

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Joined: Jun 2004

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From: Grand Rapids Michigan

Yet another fine thread gone to hell...

I agree that bypassing the relay will disable the ability for the pump to shut off when the engine stops, which might be a safety concern. But really, it wouldn't be all that hard to replace the relay with just about anything else, use the same input to trigger the relay, and keep the features intact...