On Mar 22, 10:09*pm, "Eisboch" wrote:
"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

Guys, thanks so much. That's great advice.

My interpretation (which could be totally wrong of course) of the
bleeding instructions in the Yanmar manual suggested that you would be
able to bleed all the way to the injectors via the manual pump - which
I could not do. It didn't make sense to me that you could pump diesel
through the high-pressure fuel pump with the puny little manual pump
but that was how I read it and so that is what I was trying to do.

Anyway, your advice makes logical sense so I'll try that again and
hopefully, I'll have more luck.

Thanks again for your help.

Greg