It's losing prime.....it will start and run.....you can drive it 10 miles down the road and all of a sudden it will start acting up.....it acts like it is starving for fuel...the filter loses prime.... you can pump the filter and get it back going!!!! But it will go a few miles and do it again. I've put a new filter housing,fuel pump,all new fuel lines on the engine,2 new fuel line from the tank to the engine.