How does fuel pump cutoff work?
 

Hey everyone,

I'm working on wiring on my 72 Jimmy with a 2013 4.8L engine, 6L90e transmission, and e38 ECM. Before I wrap everything up, I am considering putting in an inertial fuel pump cutoff. Like this one: https://www.rockauto.com/en/moreinfo...=10756&jsn=667

But is this even necessary for this setup? My fuel pump relay is triggered by the ECM, so does the ECM disable the fuel pump after a crash? I know the later generations of trucks switch to a Fuel Pump Control Module, but I'm unsure of how my ECM works.

Any insight from owners of these trucks or engine swaps would be very helpful. Thank you!

Re: How does fuel pump cutoff work?
 

Might be some other features if in a car with impact sensors and such, cannot say for sure. The most basic feed from the ecm is the fuel pump would be energized for a prime cycle. The ecm would also shut off the fuel pump if the engine is not running.