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Old 12-03-2010, 06:32 AM   #49
Capn Chuck
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Join Date: Jan 2009
Posts: 897
RE: Small Surges in RPM Every Few Minutes.

Rick, Our diesel certainly will speed up when the filter becomes clogged. The injector pump will suddenly try to push more fuel through and then it will decrease as the vacuum builds and then increase until the engine finally shuts down. The engine will surge at least 100 RPMs or more than when it is running normally when this starts. We have run offshore for days with the engine running and then get a clogged filter and the engine begins to hunt. This has happened to us more than a few times unfortunately. A quick shut down before the engines dies and a filter change fixes the problem without having to bleed the system to get it started. We have had this happen with our original Perkins and then with our new Yanmar after a re-power. Chuck
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