My friends dad had an 70 something Dodge 3/4 ton with straight 6 Cummins diesel that he used for his landscaping business. He ran that thing for heaven knows how many miles. When the fuel filter went bad his dad just ran it without one. Sold it after many miles of use and the new owner ran that thing till it was a bucket of rust but the engine was still freakin good.
He was truly a man before his time.... (Since Dodge didn't put the first Cummins engine in a pickup until 1989.)
As usual, the BS replies in the entire thread have not a thing to do with what the OP asked.
