Rob, Recommending two things:
1. Change both filters and perform this task annually (or more often if your source of diesel is questionable.) 2. Find out if your mechanic is willing to have you “help” perform the filter change as it will likely be the first thing he’ll want to do. You really need to learn how to make filter changes and to learn how to bleed the fuel system once a filter has been changed. Changing the fuel filters will reveal a lot since you’ll be able to see what’s contaminating the fuel system or causing a blockage. Its conceivable that your primary (or lift) fuel pump that brings fuel to the engine from the fuel tank may have a worn or leaky diaphragm. Look for traces of diesel around the edges of the pump housing. An easy fix but harder to diagnose if you can get the engine to run a full speed after you change the filters. Not sure what marine education options are available in Halifax but its always good to think about taking a marine diesel course for peace of mind. I did it about 5 years ago at Annapolis School of Seamanship and it’s given me confidence to do some basic problem solving and service myself. Chuck Gilchrest S/V Half Magic 1983 Landfall 35 Padanaram, MA From: Robert Abbott via CnC-List <cnc-list@cnc-list.com> Sent: Sunday, June 26, 2022 9:38 AM To: cnc-list@cnc-list.com Cc: Robert Abbott <robertabb...@eastlink.ca> Subject: Stus-List Yanmar 2 GMF Went to take the boat out Friday for a short sail .....motoring out heading into a12 knt breeze....started to increase the RPM's and found the engine wouldn't rev about 2,100 RPM's ....marine diesel's are not supposed to be that complicated but they are to me. I wouldn't know where to start to trouble shoot....getting a mechanic to deal with it this week. I spoke to him and told him the situation and he thinks it is a fuel problem....engine not getting enough fuel....my fuel tank and fuel should be clean as I had the bottom of it replaced 2 years ago and the 2 fuel filters replaced. He thinks one or both of the filters are restricting the fuel flow.....I hope he is right but I don't think so. Possibly many are causes....restricted fuel injectors, fuel pump, etc. ....the engine has never been serviced in the 16 years I have had the boat Any insight or guidance to help greatly appreciated. Rob Abbott AZURA C&C 32 - #277 Halifax, N.S.
