Relay can this be an ordinary relay with a suppression resistor built in, a normal ice cube relay that has is 5 terminal is all you need. The wiring diagram is correct, but confusing.

https://www.amazon.com/Recoil-Automo...s%2C130&sr=8-8

Take normally closed contact and make that the "test" terminal if desired. The common terminal to the fuel pump and the normally open contact to B positive (fused).