I have an OS .91 pumped engine with very few hours on it. About three months back a rocker arm broke and OS fixed it with no problems. Now the pump is leaking at a high rate. The diaphragm must be punctured and fuel is coming out of the air vent. It is a one piece assembly and you can't replace the diaphragm. This little plastic pump costs $57 from Tower. I still had 10 days on the warranty, maybe they will honor it. Has anyone else experienced trouble with their pump on this engine? James Goss