Safe Electric Fuel Pump Wiring
Wiring up an electric fuel pump is pretty simple, and taking a few extra precautions can make it much safer than just
hooking it up to a manual switch or ignition circuit.
Doing this properly in a race car is mandatory especially when some of these fuel pumps can drain a swimming pool in
a few seconds (obviously kidding, but you get the idea)
What does this entail? First some good practices, one is proper wiring, fusing and using the right safety circuits to keep
you and your car safe. This project will show 2 basic wiring diagrams for electric fuel pumps. One without a warning
light one with. Some parts are optional like the inertia switch, but highly recommended.
You may ask what about the all in one switch like Holley offers? Well from the looks of things they don't use a relay with
it as the switch seems to be capable of directly controlling fuel pump, but unclear how much current it can handle
reliably. Another potential problem is you will need to route thicker wires from your battery (which may be in the rear) to
the switch and then back to the pump. Last couple of bits about this set up that bug me are their are not provisions for
an inertial switch, wait, and oh yeah it's expensive and big.
I went with the designs below, but when it comes to safety don't let me tell you what to do, but you should actually
research it and make your own choices.
Oil Pressure Switches, (many types available common below) -
2 Terminal Basic Normally Open
3 Terminal Normally Open, and Normally Closed
2 Terminal Harness Adapters(Harder to find)
Part Number 1053 Harness Pigtail
3 Terminal Harness Adapter (Should work with 2 Terminal)
Inertia Switch Available in many styles some examples -
2 Diodes 1N4007 or 1N5408 (Assortment) 1N4005-1N4007 will all work fine
Side Marker Lamp or Other Indicator if building the DELUXE version. Some examples here.
Plenty of pictures below and finally the wiring diagrams!