D21 fuel issues

Blow backwards into the tank. The outlet to the tank is plugged or hand primer has a blockage.

Edited by DrAllis - 13 Apr 2025 at 6:55am

I have left fuel cap loose and blew both ways into fuel tank. It's still wants to drain fuel filter. I'm thinking I need to replace plunger would that cause problems?

May not be the problem but we had a used skid steer that we were testing and after running a while it would shut down.  Upon inspection there was a stick (someone's fuel gauge) in the tank that would float to the fuel intake and shut off the fuel flow.  We ended up opting for a new skid steer.

Not at all a diesel, but I had a very similar fuel issue on my Super M. There were multiple dead moths semi-suspened in the fuel tank that would eventually get drawn to the outlet and starve the tractor. If I let it sit for 10 minutes the moth carcasses would eventually drift/float away from the outlet and it would fill the carb again. Blowing air through the fuel line obviously didn't get rid of them for long and they would just keep getting drawn into the outlet until I figured out what was going on and pulled them out.

Aluminum foil from a bottle of fuel additive stopped our 6060 when it got down to 1/8th-1/4 of a tank of fuel. Put more fuel in it and it ran fine. Finally pulled the tank later that summer and flushed it out. Quite shocked that the dime size piece of foil caused such a problem. Sounds like you may have something in there for sure as others have said. Just letting you know what happened to us.

You've had the tank off once already ?? Did you use a power washer and aim it in thru the fill hole?? and then aim it in thru each sediment bowl hole (sediment bowls removed) and drain/flush?? doing this more than once ??   I've only seen one tank bad enough that this method wouldn't work. The tractor (220) had been sitting 25 or so years. I feel it was going to require tank removal, cut open each end of the tank and clean with a power washer from each end or maybe sand blast too. It also may have required cutting the tank open underneath where the seat suspension track is and doing the same thing. Any good semi truck repair shop works on truck fuel tanks can do this. Each location is out of sight when the piece removed is welded back in place. The paint will match when you get done. I sold this tractor with the new owner knowing this. Don't know what he did for sure.           EDIT:  You should be able to look in thru the fill neck and get a good idea what it's like on that end of the tank. I would cut open the opposite (right) end first and see if that might be enough to get her cleaned out before cutting open both ends and the seat track area.

Edited by DrAllis - Yesterday at 6:16am