My 1991 Evinrude 9.9 would die unless pumping the bulb almost constantly. I put in a NAPA fuel pump rebuild kit (hopefully correctly) and it helped some, but I still have to pump the ball occasionally. I'll have to admit I didn't take adequate notes when I dissassembled the fuel pump for the first time. Also, recently switched to a synthetic blend 2-cycle oil. Motor starts and runs strong otherwise. Thoughts?
No, all recent problems after rebuild. Took it out today. Hard to start now, have to pump ball every couple of minutes at no-wake speed. Runs fine at high speed.
Could my switch to a partially synthetic two cycle oil be causing problems. Sometimes the ball pumps up hard, and sometimes it doesn't. It pumped up hard when I went to start it, but had to pull a lot to get it started.