..since my local Yanmar guy is almost impossible to reach, I figured I'd do my own maintenance. Impeller, fuel filters, coolant, oil and filter, etc. Also had a bad guage. Who'da thought that the impeller was the MOST expensive thing at $65 for the 4JH2E. I think my old 3GM30 was about $20. Am I the only one surprised? Must be a high margin item;>( Oh well, it keeps ten grand of engine happy, so it's probably disingenuous to gripe. For sure I'll keep the old one as back up! Rick D.