I've bled the fuel system about 10 times, seems like it's better but then it just does the same thing again...
I will try the other idea's, how do you clean the screen in the fuel tank?
There is no screen in the tank, only in the water separator. I have found a few that the screen its self was restricting the fuel and keeping the air in the bowl. You can leave the screen out to check it. Do not keep running the tractor without the screen any longer than to see if the air disappears. It should clear in several seconds with just the electric pump running.
If you are getting air in the water separator, there is a clog between the tank outlet and the separator or a vacuum leak between the fuel tank outlet and the separator outlet, or the vent in the fuel cap is plugged. The vent can be checked by just leaving the cap loose or removing it and laying a rag over the opening.
The electric fuel lift pump sucks fuel from the tank and through the separator so it has to be sealed tight.
Check the separator bowl for cracks, check the o-ring that seals the bowl and check to see that the fittings are tight in the separator head.
Remove the hose from the inlet side of the separator, remove the fuel fill cap and blow air through the hose into the tank. Reinstall the cap and hose, then run the tractor to see if that corrected the air in the bowel problem. If it did, you have debris in the tank that was plugging the outlet or plugged the hose. The tank would then need to be cleaned