Spent 6 hours chasing a no start on a 2012 Cummins, turned out to be a $4 fuel filter o-ring

Leo Hall · 2026-10-02T18:30:03.256267+00:00

Truck came in last Monday with a crank no start, I bled the lines twice and swapped the lift pump before I pulled the filter housing and saw the o-ring was pinched flat. Anybody got a go-to trick for spotting air leaks on the suction side without pulling everything apart?

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Spent 6 hours chasing a no start on a 2012 Cummins, turned out to be a $4 fuel filter o-ring | Diesel Mechanics - Librear