Ok now we are getting somewhere... As far as I know there is nothing between the tank and filter.
Look at the filter, the line on the left is the line that goes to the tank, it will run behind the engine then up to the tank.
While you are looking, the line on the right goes to the fuel pump, you will see a gold looking thing that looks like a filter, that's the pump, I don't think that is your problem.
I think your problem is you have "crap" (for less then a better word) in your tank. While the tractor is moving the "crap" is blocking the feed to the filter. Solution, empty the tank, remove and clean, install. You can take what ever short cut you feel you can to clean the tank if you don't want to remove it. The best thing I can come up with is, remove the "left" line from the filter, let the fuel run into something so you can see the "crap" that could come out, then take compressed air and blow into the fill opening (use a rag to block what you can so to pressurize the tank around the air supply, airgun) and see if any "stuff" comes out of that line.
To add, if nothing comes from the tank, all is clean, then I am wrong and your fuel pump is bad, replace it, but to me, if you go dry at the filter, it seems a supply problem and not a delivery problem... I am 100% sure it is one problem or the other I have posted here.