Sounds as if metering valve in IP is stuck. "Lightly tap" side of IP with a small hammer. Have put any fuel conditioner in fuel system?
If it was my tractor I'd try tow starting it. Several yrs back I owned a Ford 3000 with a none operating fuel gauge. The older gentleman that operated it for me pulling a hay rake would drive by my fuel storage tank with only a small amount of fuel in tractor tank to hay field. After tractor died & fuel tank was filled I would bled fuel system until I got flustered. Then I'd tow the tractor & it would start running in less than 10 ft.
Do you have a way to jack up the loader? If so, put the lift/boom valve in float, jack up the loader and put the valve back to center. The loader should stay up.
When attempting to tow tractor with a FEL resting on ground simply route tow strap/chain from towing vehicle under FEL tube connecting both boom frames then connect strap to tractor frt axle. Putting tension on strap should raise boom but if that doesn't raise boom enough then another option is raise boom with a jack & block with a piece of angle iron the correct length placed on one boom cylinder shaft held in place with a zip tie or 2. Place 2040 in 8th gear & be sure fuel stop on IP is in correct position then begin towing.