Understanding Return Style Fuel Systems

[JoshK]

Could someone here tell me what relays I need to use for the pumps?

 

[JeremyH]

Depends on how your going to run it. Individual relay and fuse per pump or one for both. I use bosch styel 4/5 pin 40amp automotive relays. Which will run one or 2 pumps no problem. But if your going to run 3 pumps with one realy I would go with a 50-60 amp but they can get expensive. You use the inertia wire through the relay to ground to trigger the relay and the relay will feed power from the battery directly to the pump, no fpdms. And then the ground wire from each pump goes right to chasis. I would use at least 12 gauge wire, but 10 gauge would be prefered to minimize heat and amp pull.