Kubota BX2200 Chugging and losing power

[Vernwvu]

I am trying to figure out why my tractor is losing power. For the first 20 minutes after I start it, it will run fine. Then it will start to lose power, gain power, and lose power again without me touching the throttle. I have changed both fuel filters, drained fuel line, added sea foam, and tried new diesel. Any ideas?

Here is link to video
http://youtu.be/fw3fCsXvmkE

 

[Lil Foot]

Fuel tank vent plugged? Something in the tank intermittently blocking the fuel pickup?

 

[motorhead]

Fuel tank vent plugged? Something in the tank intermittently blocking the fuel pickup?

I second that.
I see you have an hour meter. How many hours? Have you a way to check the fuel pump?

 

[birddogger]

Something in the tank intermittently blocking the fuel pickup?

Yeah, people will be sick of hearing this, but so you understand it can be something weird, and you are somewhere nearby; I found a stinkbug in the tank that would come and go.

The machines seem to be very sensitive to fuel flow, and it doesn't need to be blocked very much to cause erratic operation. Drain the tank. Pull all fuel lines and swab them out or just replace them. Even the return line from the injector rail to the tank becomes stuffed up and causes the feel that it is not getting fuel. Biologic "goo" can grow in the tank and lines and cause the blues too.

 

[CornFarmer]

Heres what I would do... I would loosen the main fuel line that runs to your sediment bowl and blow air back though the tank(have as little fuel in the tank as possible) with fuel cap removed. Do the same with the return line from the pump back. You may also want to do the same with the line that runs from the sediment bowl to the top of the pump. Do NOT blow air into the injector pump thou.

Whens the last time the tractor has had the air filters cleaned or changed?

I have found in my 15000 plus hours with M series tractors that there real finicky when it comes to clean air filters.

 

[B7100]

Blowing the line back to the tank, if it cleared any blockage would only serve as a temp solution and may block again in the middle of an important job.Much better to clean out tank and then blow out lines.
dave

 

[Vernwvu]

Thank you for all the help. Any suggestions on how to clean out the tank? Remove the whole thing?

 

[CornFarmer]

Thank you for all the help. Any suggestions on how to clean out the tank? Remove the whole thing?

Couple ways of doing it, but trouble shoot the problem first before opening awhole other can of worms. I would as I mentioned in my post above first... Blow the lines out, run the tractor and see if that solves the problem. If so,then get after cleaning the tank.

In the last 5 years I've had lots of issues like this on equipment because of B-10. Bio diesel acts as a fuel tank cleaner and whatever crap that's stuck on the bottom of the tank gets loosened up... And well, it ends up plugging fuel filters and lines. The air trick has always worked for me.

 

[Timberbank]

Fuel tank vent plugged? Something in the tank intermittently blocking the fuel pickup?

I have an MX5000 that starts fine, runs for 15 minutes snow blowing the driveway. It then loses power and won't rev over 1500. I bled the system. Nothing in the fuel bowl, brand new air, oil and fuel filters. Where is the vent for the gas tank? I cleaned out the four holes on the under side of the cap and the middle. Dealer is backed up two weeks due to holidays. Any suggestions would be greatly appreciated. Thanks.

 

[D2Cat]

For a test just loosen the cap or even remove it and run for a while and see what happens.

 

[cerlawson]

I used to have a BX and finally traded in for just a mower because of continuing fuel problems I would find similar problems and tested the fuel pump pressure and found it to gradually weaken. Sometimes it would fail after only 15 to 20 hours. The factory originals cost about $145 whereas the Chinese pumps were at $15 and up. The originals failed later but still not any where near the 100 that was required for maintenance. I installed a larger first stage fuel filter as a Canadian writes about with his posts here, but it didn't cure the fuel pump failure problem. The pumps are nothing more than a small piston moving back and forth, probably wearing the inside of the cylinder. Once they cure the fuel filter and pump problems this would be a nice tractor..

 

[Theofile]

I have a similar problem. Based on another post, I looked at the line to the fuel pump - frayed and bare. Am fixing. I'll let you know if it fixes the problem.

It didn't fix the problem but blowing air thru the fuel line before the first filter did. There was only a trickle then came the flood.