One for the electrical gurus........auto switch off

[Stot]

Depending on the reasoning behind a fuel pump relay here is a diagram showing the way I ran the fuel pump on my old carbed crossflow car.



Turning on the ignition would energize the coil meaning that to get power to the fuel pump you had to be cranking the engine. Once the engine starts the oil pressure has built and the coil de-energises supplying power to the fuel pump from IGN live. If the engine stalls or you lose oil pressure for some reason the coil energizes and the fuel pump will stop again until you crank it again.

Cheers
Stot