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Old 03-25-2020, 09:44 PM   #91
hatzie
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Location: Wentworth, NH
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Re: 1973-1991 Dual fuel tank systems theory of operation

Quote:
Originally Posted by Ford Assassin View Post
I guess I am confused. I have a separate relay for the fuel pump in my stand alone harness. Why would I want to run through another relay? Not meaning any insult, just asking for clarification.
The terminals in your relay are open to the weather for corrosion to get into the wires, terminals, and the relay itself. A setup like that will likely last a few years before the corrosion sets in. I've run that exact relay socket type in the engine compartment and it lasted about three years before the green puss ate it up.

The GM fuel pump relay is a sealed unit with a sealed Metripak plug. The terminals are not likely corroded after 30+ years in service.
And you can tie it in with one wire directly from the LS PCM.

Your choice.
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RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.

Last edited by hatzie; 03-25-2020 at 09:54 PM.
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