I have an older Yale. Pre 2000 and I walked in and found a no start. Cranks just fine but I checked the battery anyways. Checked for spark next and we have good spark. So I went to fuel. Made sure tank was full and on. Then I took the low pressure hose off the IMPCO mixer and I was getting no fuel thru. They looked old and worn. I took the lower hose off and seen sludge. Went ahead and replaced the filter and converter thinking it would fix the problem. After replacing still no fuel to the mixer. Can't find a book on this. Looking for any help with pointing in the right direction.