Update: I pulled the fuel tanks and cleaned them. I replaced brittle pick up lines. Cleaned out all fuel lines. Then re-bled and ran injector cleaner through it and it changed nothing. So fearing the motor may be bad I thought what do I have to lose tearing into the injectors. Pulled #1 when...
I should also mention that I’m not getting any fuel through the return line. Could there be dirt plugging the injector? Would that cause a knock? I did not use any ether on it
I have an f935 mower that I ran out of fuel. I got it bled and it starts right up but now I hear a knock while it’s running. It also smokes a little. But when I loosen the #1 injector (the one closest to the flywheel) the knock stops, it quits smoking and it idles smooth. What could be going on?