Join Date: Jun 2006
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Yanmar SB12 Fuel Pump Problems
My 1978 went to bed last fall operating perfectly. This spring it won't start. Assuming fuel issues, I cleaned the fuel filters and bled the system. No go. Further diagnosis show the low pressure fuel side OK, but I have no pressure at all on the high pressure side.
I have fully diassembled the fuel pump all all looks fine. No dirt, no broken springs, etc. Still, when the engine is turned over with the high pressure line taken right off, there is no fuel coming from the output of the fuel pump.
Does anyone have any ideas on this?