Yanmar 2GM20F, raw water pump
When winterizing my Yanmar 2GM20F, I have usually detached the intake hose from the raw water pump, attached a new hose leading to a bucket of antifreeze(on the cabin sole, at approximately the same height as the pump) and winterized the raw water side. This year, however, while the pump sucked up raw water properly, it would not lift the antifreeze from its bucket. Last year the same thing happened and was easily solved with a new impeller, but that didn't work this year.
My plan now is to double check my impeller installation and try a new, extremely carefull measured intake hose.
Could this be caused by any other problems in the cooling system - clogged intercooler, exhaust elbow,etc???