Hi

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.

Any suggestions???

Thanks in advance.

Greg

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.

"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

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

wrote in message
...

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

------------------------

The procedure we used was like this:

One guy cranked the engine while the other slightly loosened the fuel line
nut until fuel started squirting out. You could see the air bubbling out as
well. While still cranking the engine, we'd re-tightened the nut, then
we'd move on to the next cylinder. Like I said, it took several times on
each line to get all the air out so the engine would stay running. In
fact, we killed the battery and had to take a break while recharging it
halfway through the process.

There may be an easier way, but neither of us were diesel experts. It
worked though.

Eisboch

"Eisboch" wrote in message
...

wrote in message
...

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

------------------------

The procedure we used was like this:

One guy cranked the engine while the other slightly loosened the fuel line
nut until fuel started squirting out. You could see the air bubbling out
as well. While still cranking the engine, we'd re-tightened the nut,
then we'd move on to the next cylinder. Like I said, it took several
times on each line to get all the air out so the engine would stay
running. In fact, we killed the battery and had to take a break while
recharging it halfway through the process.

There may be an easier way, but neither of us were diesel experts. It
worked though.

Eisboch


Another suggestion ....

When it starts acting like it's trying to run but still dies, open the
throttle up quite a bit before you start cranking it. Like almost wide
open. Sometimes the extra RPM it builds up allows it to stumble through
the last remaining bubbles of air.

Eisboch

Remember to release the compression when you run the engine to bleed
the injector lines.

"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

On Sun, 22 Mar 2009 20:32:38 -0700, "Mike" wrote:

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.

Even if you are careful about not running out of fuel there is still
the issue of replacing fuel filters periodically. Some engines are
easier than others. Our primary generator has a 4 cylinder Yanmar
that is self bleeding for the most part but you do have to pre-fill
the new filter with clean fuel and crank it a bit.

The main engines for the trawler are DD 6-71s which are self bleeding
if you crank them enough but the engines consume so much battery power
while cranking that it is very easy to end up flat before they light
up. The solution is to install electric fuel pumps which can be
valved online when needed. You can hear the sound of the priming
pumps change when the injection system is fully charged, and the
engines will then fire up on the first turn.

"Eisboch" wrote in message
...

"Eisboch" wrote in message
...

wrote in message
...

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

------------------------

The procedure we used was like this:

One guy cranked the engine while the other slightly loosened the fuel
line nut until fuel started squirting out. You could see the air
bubbling out as well. While still cranking the engine, we'd
re-tightened the nut, then we'd move on to the next cylinder. Like I
said, it took several times on each line to get all the air out so the
engine would stay running. In fact, we killed the battery and had to
take a break while recharging it halfway through the process.

There may be an easier way, but neither of us were diesel experts. It
worked though.

Eisboch


Another suggestion ....

When it starts acting like it's trying to run but still dies, open the
throttle up quite a bit before you start cranking it. Like almost wide
open. Sometimes the extra RPM it builds up allows it to stumble through
the last remaining bubbles of air.

Eisboch



Years ago, one of my drivers ran the diesel delivery truck out of fuel. As
he was in the service station. Lucky for us. Another trucker with a Semi
pulled over next to him and use a line off an air compressor he had. (worked
great for an air powered lube gun he said as well as tires) and Pressurized
the fuel tank via the air hose and a rag. Driver said after few times
turning over the engine, she ran. I guess the air in the injector lines is
forced out quickly by the tank pressure. Ford 550.