kubota B2410 needs full tank to run

[lquick]

Kubota B2410 needs a full tank to run, after I use about 1 gallon of fuel the engine slows and stops.
I have loosened the fuel cap, and put on a new filter, same thing.
When i change the filter the fuel runs freelly from the tank.

What could be the problem?

Lloyd

[DieselMonk]

may be she is sucking air? engine slowing and stopping means there she is not getting enough fuel.

[lquick]

Where could it be sucking air from?
It runs great with a full tank.

Lloyd

[RoyJackson]

I think you have a blockage of some sort in the fuel tank.
I suggest you drain the tank completely and see if there's anything in there.

Loosening the fuel filler cap with the same results eliminates a blocked vent, I should think.

[lquick]

Thanks!

Lloyd

[gerard]

I second roy. Sounds like with a fult tank you have enough head pressure to force enough fuel past the restriction to run normal, then once head pressure diminishes, not enough fuel flow ocurrs. You might be able to remove the filter after draining the tank and use your air compressor and a blow gun to blow some air back into the tank. That should dislodge anything stuck in the tank opening.

[Chilly807]

Another thing to consider is that the fuel return line goes back to the top part of the tank. Is it possible that once the fuel level drops below the return line the engine stops?

I'm not sure if the return line can also feed the injection pump on your engine, if the return line only goes to the injectors then I'm off track with this line of thinking.

Will the engine re-start if you remove the tank cap, wait a few minutes, then bleed and go for a start?

Sean

[Don87]

There was a gentleman in here with the same type of problem once. He purchased a used rental tractor, and apparently someone had put some sort of epoxy into the tank. After he ran it for a little while, the epoxy would drift down in the tank and block the fuel flow

[MHarryE]

I had a tractor with a faulty lift pump that did what you described. It would run okay full but lose power and eventually die once the fuel reached 3/4. We determined it was either back feeding through the return or had a high enough head to feed the injector pump when full, but the injection pump was starved once the fuel level dropped. Not sure how your tank sits relative to the injection pump but this could be something to look for.

[pat32rf]

When did this start? Is there any chance that the feed and return line are reversed?