Okay to run fuel pump with out ECU

[BigB]

15-17 coyote crate and harness.
Is it okay to run the fuel pump independently from the ECU system? I am thinking of wiring a fuel pump on/off switch for added safety and security. Will this affect the ECU function?

[michael everson]

Shouldn't be a problem
Mike

[edwardb]

Mike is right, of course. Wouldn't be a problem. But another option to give both -- switched plus managed by the ECU -- is to put a simple SPST switch in one of the inertia switch wires. Break the ground and the fuel pump relay in the RF fuse panel is opened. Did this on my #8674 Roadster build and works as expected. The switch is on the center panel under the dash.

[Bob Cowan]

I agree with edward. I think it's important for the ECU to control the fuel pump. If you get in a crash and the engine stops, so will the fuel pump. If it's wired separately, the pump will continue to run until you shut it off. That could be a real fire hazard.

[BigB]

The ineritia switch works by impact correct? For example you get in an accident and the inertia switch will shut down power to fuel pump?
I am using the infinity box (isis) system. I have all the options to wire the pump through; ECU, ignition switch, or seperate mechanical switch. I was planning on putting inertia in regardless.