Fishingpcola
New member
I was flushing the motor by running it and I had the cowling off. I could hear a knocking noise that I thought was under flywheel cover. A buddy of mine came over to help diagnosis the problem. We discovered by placing a thumb on the value cover and moving down that it seems to be the low preasure fuel pump making the knock. It had the hardest vibration. Could this be a caused by using ethanol gas 5% a few years. Last year I switched to straight gas. Does anyone have experience with their low preassure fuel pump knocking? Thanks, this is my first post.