elec. fuel pump relay wiring diagram

Don't forget to add a normally open pressure switch to your motor fed from the high pressure side of the oiling system that closes around 15 psi. This will obviously shut off the pump when the motor dies.

It's also nice to wire in a bypass switch (on/off), so you can prime the system with the key on & motor off. You can hide a switch too, so you have an anti-theft device.