23/02/2026
Finding faults is often time consuming and challenging, had a 2014 ford fiesta, A normally bulletproof car, but occasionally faults do occur.
Been at a couple of garages for fuel pump fuse blowing randomly. Fuel pump replaced (Twice) but still occasionally blowing the fuse.
Another fault was related to the mass air flow signal being out of tolerance.
Followed the wiring diagram and it was showing both the fuel pump supply and mass air flow sensor share a common feed.
Checking the feed to the plug at the air flow showed a dead wire, yet the fuel pump was live as the engine was running.
Traced the wiring back from the air flow sensor I came across the issue, the wiring loom had been rubbing on the metal frame of the chassis and rubbed through shorting out the supply.
No parts, no misdiagnosis, a couple of hours of logical fault tracing to ensure a correct repair.
