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Can't prime Yanmar 2GM20
"Eisboch" wrote in message ... "Wayne.B" wrote in message ... On Sat, 21 Mar 2009 22:45:59 -0700 (PDT), wrote: I did a service on my Yanmar diesel on the weekend (including fuel filter) and now can't seem to prime it. I've followed the instructions in the Yanmar manual and although I can get fuel flowing through the fuel filter bleed valve via the manual fuel pump lever, I can't seem to get it to 'bleed' beyond the fuel injection pump. I repeatedly pump via the manual handle but nothing seems to come through. I tried turning the engine over as I thought it might be an issue with the 'position' of the fuel injection pump but this did not seem to make a difference. Did you fill the new fuel filter with clean fuel before reinstalling it? If not, that's your problem. Also, lubricate the rubber seal on the new filter with clean fuel before you install it. You will not normally be able to bleed fuel on the output side of the injection pump without cranking the engine. Back off the nut on one of the injection lines going to the cylinders, crank the engine while you watch and see if fuel is coming out. If not, re-bleed the input side of the injection pump and try again. I helped a guy get his 3GM30 Yanmar going after he ran it out of fuel. The 3GM30 is the 3 cylinder version of the 2GM20 (and happens to be the same as the engine in my John Deere tractor). Anyway, neither of us really knew what we were doing, but we basically did as Wayne suggested. After putting fuel in the tank and removing and priming the filters it wouldn't run. It would fire and die. We then loosened the nut on the injector lines going into the cylinder head, one at a time, and cranked the engine until fuel was leaking out, then retightened the nut. Then we would move to the next line and repeat. It took about 3 or 4 times going through this process for each cylinder before all the air was bled from the lines and it fired up and remained running. I've kept this process in my memory just in case I ever run the tractor out of fuel, but fortunately I have not in 8 years. Eisboch As a young lad, spending time on my grandfathers farm, it was drilled into my head to NEVER, EVER let the tractors run out of fuel. There was no excuse other than laziness to let that happen since we had fuel onsite. I let it happen once, and boy was he ****ed. I watched/helped him go thru the procedure you described above. It never happened again. --Mike |
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