Wiring priming fuel pump

There's a lot of good information here especially the relay wiring and the safety senders and switches. I will say though, for a priming pump that you will energize for 5-10 seconds before starting cold, a lot of that is overkill. Direct battery feed through a fuse protected momentary switch would be fine. If you want to pull a signal through a switched circuit, I would use a relay but you will need to turn the ignition on to be able to run the pump. With my point type ignition cars I don't like to turn the key on for very long.