not runing right

[j. elliott]

very new to this so bear with me. I have a m108s that has less than 1500 hours on it. tractor has been running fine up to last week while baling hay it cut out a little bit then quit finished baling. Started a new field did it again only worse. changed fuel filter and drained water separator tractor runs fine till you put under a load at 540 then it starts missing and sputtering till you idle it down then its fine. The only thing i noticed is when the electric pump is unhooked from the filter it does not exactly squirt out like you would think it should. Any body have any ideas. thanks

 

[BAP]

Sounds like you either have something plugging the fuel line, the outlet in the fuel tank or the vent in the tank. Another thing to check is any rubber fuel lines that could be deteriorating inside and causing reduced fuel flow. I am assuming that you also checked your air filter?

 

[Dave_eng]

Do you know that your M108 has an electronic controlled common rail fuel injection system.

I have attached a page describing the fuel system.

Unless you have some particular training in these systems, I would suggest you call for dealer help with their proprietary computer system.

Do you have n Owner's manual which would tell you where the trouble codes appear on the dash.?

Dave

 

[eserv]

very new to this so bear with me. I have a m108s that has less than 1500 hours on it. tractor has been running fine up to last week while baling hay it cut out a little bit then quit finished baling. Started a new field did it again only worse. changed fuel filter and drained water separator tractor runs fine till you put under a load at 540 then it starts missing and sputtering till you idle it down then its fine. The only thing i noticed is when the electric pump is unhooked from the filter it does not exactly squirt out like you would think it should. Any body have any ideas. thanks

At the inlet of the fuel filter there is a 90 degree fitting that is prone to clogging with dirt. remove the fuel line that goes from the fuel tank to that fitting and blow back through from the filter housing with compressed air to remove the debris. This is a common occurrence on all Kubota machines that use that filter design if any contamination gets into the fuel tank. This is the primary filter, the one with the clear plastic bowl.

 

[j. elliott]

Sounds like you either have something plugging the fuel line, the outlet in the fuel tank or the vent in the tank. Another thing to check is any rubber fuel lines that could be deteriorating inside and causing reduced fuel flow. I am assuming that you also checked your air filter?

Yes on the air filter, and have thought there could be a plug or a bad fuel line but haven't checked that yet.

 

[j. elliott]

Do you know that your M108 has an electronic controlled common rail fuel injection system.

I have attached a page describing the fuel system.

Unless you have some particular training in these systems, I would suggest you call for dealer help with their proprietary computer system.

View attachment 63879

Do you have n Owner's manual which would tell you where the trouble codes appear on the dash.?

Dave

Yes it does have a fuel rail system and yes this is one of my fears it could be ecu. there are no codes appearing on the dash. Its kinda funny i have 9540 thats newer with a regular pump and injector system.

 

[BAP]

Yes on the air filter, and have thought there could be a plug or a bad fuel line but haven't checked that yet.

Read closely Eserv’s advice, he knows more about Kubota’s than most people because fixing them is what he does.

 

[eserv]

Did you get this one fixed?