They don't.abscate wrote: ↑03 Jun 2024, 04:06 I don’t think the relay modulates the fuel pump voltage. Mr Al did a deep dive into this relay amd concluded there is 40 Hz safety signal that shuts off the pump if the engine stops , implemented through this relay
I don’t see a way to feedback engine rpm to this relay in the wiring diagram
That story could be valid for old cars with "K" jetronic systems.
