Join Date: Jan 2007
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today, changed the yanmar fuel filter (old one was spotless anyway), and primed the fuel system with the bleed screws on the fuel filter unit, and injection pump (using the small, manuel pump). Still ran bad. While it was running, loosened of both injector nozzle nuts (one at a time), which imediately caused the engine to work poorly both times (I think this rules out my running only / partially on one cylinder theory - as it was the same on both cylinders).
One thing confused me, - after I bled the lines to the injection pump bleed crew, I loosened the injector nozzle nut(s), but could not get fuel to them, by using the mauel pump. However, it still started OK. Is there a chance that air, or something would cause it to run poorly, but still start fine. It only has about 1/4 of the power it should - for example, the shaft and prop turn, but even when I increase the throttle, i barely / or really don't have enough power to move forward - against moderate wind - to my mooring ball. Yesterday, it would only do about 2 knots - running poorly, but would then easily do 5-5 1/2 knts, when it came out of it.
Could the old, stale fuel cause it to work badly for a while, theb suddenely work great for the next hour? Or would it not work somewhat poory all the time. There is no water in the racor filter / separator. I have not taken it apart, just drained a bit of clear fuel form the bottom.
Reading a couple of maneul, is there a chance that the governor, or something else is sticking?