O.K. Gsxr I drove down to the dealership this morning and retrieved the filter, draggged it back to my business and carved it in two. I just couldn't believe what I saw.....black sludge and lots of it. Bad load of fuel from someone. I'll be installing a vacuum gauge soon, then I'll know. By the way I used to dragrace a Suzuki motorcycle (Topgas) similar to the prostocks back three years ago.