This will probably sound dumb, but what do you use to clean the fuel filter with? I also took my fuel filter off, but was unsure how to clean it, so I just put it back in. Based on how tightly the cap was screwed in, I don't think it has ever been taken off and cleaned. However, I am also interested in possibly putting in an in-line fuel filter. I've read on here that they seem to work better at actually filtering the fuel. Until then, I will stick with my stock fuel filter.