MX5100 Fuel Injector Leak

[Moabion]

I just bought my first Kubota! 2011 MX5100 with 852 hours. Got home and as soon as I got it off the trailer noticed low power. like 1500 RPM max, I looked it all over and noticed an injector leaking at the head. bubbles coming up.
I also added some fuel treatment and bled the system. Power has come up, but governor seems unstable. Still chasing fuel delivery possibilites but I think I have two probably unrelated issues. Back to the leaky injector. I tightened the nut holding down the fuel return line and the injector fuel line. I blew it all off clean with compressed air and watched it.
The first spot to get wet is the groove where the two sections of the injector body. Run it a while and you can see bubbling fuel at the base of the injector where it screws into the head.
Anyone see this before? Ideas?
Do I have to remove the fuel tank to get at the injector like it appears?
Thanks!!

 

[200mph]

I've seen bubbling at the interface between injector and head. There is a copper washer that needs replaced. While this should be repaired, I don't think this is the root cause of your problem. My neighbors well worn B9200 had major leakage/bubbling at the injector/head interface and the tractor ran fine. In his case with the many hours on the machine we replaced the injectors and copper washers.

Can't comment on the injector body leak.

 

[North Idaho Wolfman]

Since your chasing issues, pull all the injectors and send them to be tested, and possibly rebuilt.
Replace all the sealing washers when you replace the injectors.

And yes sadly on some models it does require removing the fuel tank to get to parts.

You can get the WSM (aka service manual) for it here: https://www.manualslib.com/manual/1233781/Kubota-Mx5100.html