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backcreeksailor 05-27-2009 10:23 AM

Yanmar 2QM15 - Changing the Fuel Filter
This looks simple enough, unscrew the bell, change out the filter, screw it back on. But I've already had a couple 5 minute jobs turn into 5 hour jobs, (e.g. the frozen zinc I'm still trying to remove...). So...

When I unscrew the bell that houses the filter, how much diesel fuel is likely to spill out? And what's the best way to contain it? (I don't want to reintroduce the diesel smell that took me a month to get rid of after the first got the boat).

Am I going to have to bleed the system after I do this, or will just cranking it work out any air in the system?

Northeaster 05-27-2009 11:43 AM

I would put a couple of rags underneath, to catch the spills, and have a small ice cream container to pour the rest in. Will be 1/4 - 1/2 cup or so.

When you put are putting the new filter on, fill it up near the top, so you don't have to prime as long afterwards. It takes a while to fill the whole space using the manual pump.

There are lots of posts on priming, but if the manual pump doesn't feel like its doing anything, you usually can turn the crank by hand, 1/2 turn or 1 turn and then retry - as the pump only works with the crank / camshaft on a certain stroke.

Gary M 05-27-2009 12:36 PM

The other trick for bleeding air that I picked up here is to put an outboard style priming pump in the fuel line right where it comes out of the tank.

Then there is no messing around with the manual pump that I never seem to get to work. Just hook everything back up and open the vent on the first filter and pump till diesel comes out then move on to the second filter, works great.


backcreeksailor 05-27-2009 01:37 PM

Ok... I see a bleeder bolt at the top of the filter case. But I'm not seeing anything listed in the service manual diagrams that's described as a "manual pump". Where is this located?

After installing the filter, will just cranking the engine with the starter long enough pump out the air? Or will it remained trapped in the lines until I bleed them?

CrazyRu 05-27-2009 02:27 PM

Fuel pump on the engine has manual level, to pump fuel up manually. It is hard to get to on Yanmar 2QM15. Fuel pump located under fuel filter, the filter’s input fuel line starts at fuel pump, it is small round shaped thingy. There is a level under the pump. You need to pump it, make sure you bring it all way up on every stroke.
2QM15 require to bleed
1. Fuel filter(screw on top). There is disposable plastic washer under it, you need to replace it frequently
2. Fuel return lines on injectors, start with rear one. There are cooper crushing washers, need to be replaced when crashed
3. Fuel lines at injectors

Northeaster 05-27-2009 02:50 PM

Gary - I have thought about putting an outboard squeeze bulb on, before the racor. However, my concern was that my current fuel lines, from tank to racor, and racor to manual fuel pump, have nice "professional" fittings terminating them. I did not wasnt to cut them off, to spice in an outboard type hose with hose clamps, for example. I was afraid of having air leaks.

How did you connect the squeeze bulb? Can you get them with "standard" fittings to connect to the existing fuel line?

billangiep 05-27-2009 03:36 PM

I also use the primer bulb for bleeding. They can be purchase with different size hose barbs.
I believe the little Yanmar filter is a five micron, I use a two micron in the Racor that way I figure I never have to mess with changing the Yanmar filter?

LittleWingCA 05-27-2009 05:01 PM

My engine mechanic used a motorized pump that he used to suck the oil out of the drip pan. He added a small metal tube insert on the hose end, and attached it to the return hose after the injectors, that also goes back into the top of the fuel filter housing instead of the tank on my 2QM15. When he applied the suction, the fuel was pulled from the tank, through the Racor filter, past the mechanical pump on the engine, into the fuel filter housing, into the injector line, and when some came into the waste oil bucket, he shut the pump down, and re-attached the return hose to the fuel filter housing. Thus priming the entire system. Worked really well. My engine started up on the first try. You could do the same thing with a hand pump as well.

Gary M 05-27-2009 11:07 PM

I just used the little SS hose clamps to install the primer bulb. Bill you should use a 10 or 20 micron pirmary filter before your Yanmar secondary filter. The Yanmar secondary filter should be replaced at least yearly. Even water can cause it to break down so.
With the priming bulb it is dead easy to replace both of them and then get the engine running.


SteveInMD 05-28-2009 06:52 AM

I disagree with a few things above. Do not pre-fill filters more than half way. You can end up with an air slug that gets forces into the high pressure side of the fuel system. If you do that you will have to bleed to air at the injectors as well. If you properly bleed the low pressure system you don't have to bleed the air from the high pressure side during a filter change.

The squeeze bulb isn't necessary at all. The manual lever on the lift pump actually pumps more than you would think based on feel. I don't pre-fill my filters at all and it really doesn't take that much pumping to fill the Racor primary and the engine mounted secondary filter.

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