Replace 2 GM Yanmar fuel transfer pump?

[steve poulin]

Towards the end of last season, after a few cumulative hours of running the engine, I began to get a sheen of diesel covering the oil pan beneath the 1982 13 HP Yanmar in my CD 27, and I could not for the life of me determine its origin. As I commissioned the boat this spring, I ran the engine vigorously, and produced a teardrop of diesel at the lowest point of the block. After feeling around the block, I arrived at the fuel transfer pump, and my fingertips came back slightly wet, and the photos I took seem to indicate this as the culprit. The replacement cost is not too steep, so I figure I'll start there, including replacing the hose back to the primary fuel filter off the fuel tank.

Has anyone here done this repair and encountered anything that I should be aware of? Seems pretty straight-forward (famous last words).

Thanks!

Steve

[mgphl52]

You may want to double check fittings and/or replace the compression washers before replacing the entire pump.

[steve poulin]

Good advice. They're definitely prime suspects. My thinking is that I'd hate to get the line pulled apart and put back together with new washers and cleaned fittings, re-bled and all, only to discover the leak is in the diaphragm itself, or the gasket at the block. If I'm committing that much time and effort, feels like the $75 for the entire assembly is worth it, if I only need to get in there once.