Quick fuel pump question

Mazdabater · 06-30-2011, 06:04 PM

I wanna put my carpet back down today and reinstall all my interior. When you wire in the fuel pump just the positive runs to the relay and you can put the ground anywhere yeah? Or do I have to run the ground back up to the relay as well?

NoDOHC · 06-30-2011, 11:10 PM

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.

06-30-2011, 06:04 PM	#1
Mazdabater FC3S Join Date: Jun 2010 Location: Townsville, QLD, AUS Posts: 326 Rep Power: 15	Quick fuel pump question I wanna put my carpet back down today and reinstall all my interior. When you wire in the fuel pump just the positive runs to the relay and you can put the ground anywhere yeah? Or do I have to run the ground back up to the relay as well?

06-30-2011, 11:10 PM	#2
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	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. __________________ 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)