Yanmar 324 - Engine Intermittently Running Bad / Loss of Power / Stalling Out / Not Starting

[Mahonroy]

Hello, I have a Yanmar 324 that is only a few years old with about 180 hours on it. I have kept up with all service items.

Recently I was using it and the engine all of the sudden started to stutter, loose power, and stall out. Difficult to get started again. I tried replacing the fuel filter. I was then no longer to get it started (I believe I probably introduced air into the fuel line). So I cracked open all 3 of the hard injector lines to bleed the fuel lines, and I shot compressed air into the fuel line leading back towards the tank. I kept trying to start it and after 20ish minutes it finally started, ran a little rough, then ran perfectly fine.

I put about 8 more hours on the tractor and it was running perfect. Then all of the sudden the problem returned.

I tried blowing compressed air into the fuel line again, but it didn't work (I'm not even convinced this was the problem to begin with). The tractor is still running really bad with no power and constantly stalls out.

Any idea what the problem might be? Any help or advice is greatly appreciated.

 

[Rustyiron]

Bad fuel would be my first guess, or at least a possibility.
Usually there's a little lever or knob to manually pump fuel through the lines and fill the last little bit of the filter if you are away from an air compressor.
If you end up with another filter, cut apart the "bad" one and look for discoloration.

 

[freightboy]

Did you change both the fuel water separator and fuel filter? Have you checked to see if the lift pump is pumping fuel properly? When you turn the key on, does the fuel rack click once, twice, or shutter? Have you checked the amperage to the fuel rack to insure the pull coil is actually pulling? You may want to disconnect the line prior to the fuel lift pump and see if it is restricted. If the flow is restricted fuel may not be getting through the system properly.

 

[aba4430]

I own a SA425 tractor and periodically browse YouTube for tractor related content. I found this on YouTube and it may help you. Good luck.

Starting/Running Issues