Went to rebuild by fuel pump on a 1999 Yamaha 90 hp engine. When I opened it up it was totally different from the diagrams in my Seloc manual. No cup and spring, just a thin plastic diaphram on one side and a rubber one on the other. I cleaned and reassembled and can only blow through it in one direction. Since this motor is used, am I missing these pieces or is the design different from the manual?
and that is why I dont rebuild pumps. for a few dollars more it would be a done deal. the new pump is about 40 dollars and its not worth the time it takes to clean and rebuild them at 70 per hour. it should still have a spring and cup on the diaphram. if it does not you will need one. good luck and keep posting
I guess it isn't the most cost effective method, but I get tremendous satisfaction tracking down and solving my problems. I did check with the dealer who had an exploded diagram of the fuel pump and it turns out that for the C90 there is no internal spring and cup.
90 hp Yamaha Fuel Pump
the new pump is about 40 dollars and its not worth the time it takes to clean and rebuild them at 70 per hour. it should still have a spring and cup on the diaphram. if it does not you will need one.
Linear Mode
