Injector pump and governor

[crazyal]

The fuel enters the outside of filter and exits to IP out the center. It sounds like you have algae in the fuel and your problem is a dirty filter. You need to use a good fuel conditioner to keep the algae grown down.

I had assumed that as well but that's not how Kubota plumbed it. It can't be reversed either because the inlet pipe is horizontal while the outlet pipe is vertical. Also the shut off valve is also on the horizontal line.

Do you store fuel in bulk or buy small amounts at a time. If you have a bulk tank looks like you need to put a filter on it and like was already mentioned add a conditioner.

I have it in a 55 gallon drum. This past winter I just switched to a new drum as the one I was using started getting rusty (on the outside) around the bottom bead. I have my heating oil guy fill it when he fills my tanks for the year. My pump has a filter on it so I doubt the drum is causing problems. I usually use it up in about 6 months and then buy it in 5 or 10 gallons at a time. A local gas station just started carrying off road diesel so it's easy to get.

 

[wmonroe]

I have it in a 55 gallon drum. This past winter I just switched to a new drum as the one I was using started getting rusty (on the outside) around the bottom bead. I have my heating oil guy fill it when he fills my tanks for the year. My pump has a filter on it so I doubt the drum is causing problems. I usually use it up in about 6 months and then buy it in 5 or 10 gallons at a time. A local gas station just started carrying off road diesel so it's easy to get.

That isn't long enough to store and have issues with the fuel, especially since you have a filter. I'm at a loss for what could have caused this.

 

[The Fred]

Not any lift pump info or pressure specs in the factory manual at all.

Well Al it's easy enough to drain the fuel tank on your machine and inspect or simply remove it and flush it out with a good detergent and hot hot water.

Castrol Super Clean works very well for this. Then dry using a couple cans of dry gas or alcohol, refit and fill er back up, new fuel filter then you can remove the pump seal and crank yourself OUT one turn on that 6 mm stud at the front of the pump. She'll smoke a little more but might help in the power department.

Your 2.2 liter giant should make around 48 HP. unless you do the real deal like that stupid guy Fred did.

Regards, Donald Trump

 

[kuboman]

What makes you think fuel enters the center of the filter? I have a 5740 and other kubota machines and they all exit out the center of filter. Barrels are notorious for contaminating fuel. Also most hand pump filters are 30+micron which lets enough crud through to plug filters.

 

[The Fred]

I pulled the hose off the lift pump and it free flows a pile of fuel with the engine off, that's going through the filter first.

Then I teed a gauge into the output line and it pulses from 0-6 psi. Hard to get a good reading but it moves fuel for sure.

Regards, Fred

 

[crazyal]

What makes you think fuel enters the center of the filter? I have a 5740 and other kubota machines and they all exit out the center of filter. Barrels are notorious for contaminating fuel. Also most hand pump filters are 30+micron which lets enough crud through to plug filters.

With the fuel bowl off you can easily trace which is the inlet. The fuel shut off in facing the radiator and is in line with the line coming from the tank (as you would expect) and the hole in the center of the housing leading into the center of the filter. The exit route is even easier since the hole is offset away from the engine. Directly above it is the line heading up and over the the lift pump. I don't know why Kubota did this other than to make it difficult to tell if the filter is clean or dirty. Of course it means you should never have to clean the fuel bowl. I have no idea if other Kubotas are done this way.

 

[crazyal]

Not any lift pump info or pressure specs in the factory manual at all.

Well Al it's easy enough to drain the fuel tank on your machine and inspect or simply remove it and flush it out with a good detergent and hot hot water.

Castrol Super Clean works very well for this. Then dry using a couple cans of dry gas or alcohol, refit and fill er back up, new fuel filter then you can remove the pump seal and crank yourself OUT one turn on that 6 mm stud at the front of the pump. She'll smoke a little more but might help in the power department.

Your 2.2 liter giant should make around 48 HP. unless you do the real deal like that stupid guy Fred did.

Regards, Donald Trump

I did drain the tank into two 5 gallon jugs with a clean old shirt as a filter. I didn't flush the tank out because the makeshift filter didn't catch anything. I did look in the tank with a flashlight, didn't see anything.

That was a lot of work to add a turbo to your tractor. It would be fun to do but I have too many other projects that are waiting so I think I would just find a used 5740 with low mileage. The tractor's main purpose is snow blowing. In the summer I'll use it to keep the driveway smooth and drag some trees for firewood. I've got a full sized 580K backhoe for most loader work so I really don't need more power. However id doesn't mean I want to give any up.

 

[David_Kb7uns]

My L3130 flows from the outside in.

If you have a plugged fuel line and a full tank of fuel, sometimes fuel will flow in reverse direction on the fuel filter self bleeding line between filter vent out and the fuel filter vent port on the fuel tank and as the fuel level goes down you loose power. Had it happen on the RTV1100 with water separator kit.

David

 

[ozzie tractor]

ok so for those not paying attention, a governour pulls the throttle to the closed position, while the springs pull the rack to full fuel. so by default if the governour fails, they usually over rev. if a spring fails they usually will not reach max rpm. if the fuel rack is sticky, they hunt (wont hold steady speed). as said, next time its dropping rpm, flatten the foot throttle and see if rpm increases. if not your engine is down on power or overloaded. i also agree that the gloop is bacteria in the fuel and the fuel filters feed from the outside to the inside. drain the fuel, change the filters and add a big shot of fuel treatment is my suggestion

 

[Fallon]

I've never seen a fuel bowl flow from the inside out. The whole point of a bowl is so it will collect sediment & water & that you can see all that junk outside the filter.