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As long as the current has a path to flow when the relay is closed and no path when the relay is open, you are good to go.
The fuel pump typically is wired with the positive going through the relay, as the positive comes from the fuse block and it is near the ECU which is controlling the relay, while the ground is easily attached in the rear to the body.
Don't attach the negative to the fuel tank, run it up to a good chassis ground.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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