A per the title of the thread. I'm getting towards the end of my wiring and I was wondering about cut off switches for the power to my fuel pump. What are views on the right way to go? Should I use an intertia switch that works in a crash, an oil pressure switch that works if the engine dies, use both, or just not bother?

By the way, my fuel pump relay is controlled from my ECU (BMW 2.8 engine), so perhaps this is already talking to the oil pressure telemetry??? Who knows...

Most production cars will use a inertia switch trigger to kill power to the fuel pump. Don't think the BMW will cut it based on oil pressure input alone.

Inertia switch for me . Don't over complicate things !

hate to hijack, but anyone point me in the direction of a really good cut off switch,...

thanks

Inertia. Not really much problem having your fuel pump running when the engine isn't (you'll struggle to start it if it cuts purely on lack of oil pressure) and no saying your engine will stop if you crash.

[Edited on 10/12/12 by coyoteboy]

I used an Inertia switch on my FI MX-5 engine.

It came from a Rover 216 - the early 90's model. It's located inside the car just behind the centre console that houses the radio/stereo. I got mine from a scrapyard and it cost £5.

Don't forget to cut the cable on the switch to include the socket from the wiring harness