Mitsubishi D2050 Fuel Injection Pump air leak

[hecgon01]

Hello all,

I have a Mitsubishi D2050 that the engine was recently rebuild. After priming the filter assembly and then the fuel injection pump, the tractor runs very good for about a minute or less before it starts dropping the RPMs. If I open the fuel injection primers, there is again some air bubbles. I can repeat this process several times and it seems to be consistent on how the tractor behaves each time I prime the fuel pump.

I've changed the fuel filter and replaced the hose from the tank to the filter assembly and from the filter assembly to the fuel pump but I still have the same results. The diesel is new and I also cleaned the fuel tank.

One thing thing that I have to mention is that the fuel filter assembly has an elbow that connects the filter assembly to the fuel pump and is a bit loose. I pulled out and added some Teflon tape and that seems to seal it OK (there is no visible leaking).

Is it possible that the actual fuel pump is the issue?

 

[hecgon01]

I found this old thread that has lots of possible solutions to my issue.

Yanmar loses power, slows down & kills

I'll try some of the suggestions there and will let you know the results!

 

[hecgon01]

Finally I got it working right!

I tried different things but at the end there was a problem with one of the Nozzle holders having a lot of rust residue! Ordered the Nozzles and change all of them and that was it. In the process of searching for the issue, I replaced the banjo washers so there was no more air getting into the fuel system but still the engine was not running properly. After changing the Nozzles the engine worked like new

Hope this may help someone in the future!!!

 

[oliver28472]

Glad you got that worked out and thanks for posting.