Good evening all , got an old pc200-6 farm excavator . after running fine for 20 minutes -1/2 an hour it gradually wont rev under load . After idling for a few seconds it will rev up but then the problem returns . After being turned off for a few houres its good agin for 20min/half hour then again wont rev --- thanks ---mat ---
Fuel Filters.????
it was a small white plastic sieve in a banjo bolt that holds on the inlet to the lift pump , totally blocked - surprising it ran at all ;-)