If you mean starter fluid, I tried, and it runs for a bit, then stops. Tried it many times, no go. Until I pushed air into the gas tank to make some gas come out the hose that goes into the carb (just disconnected it for the procedure), it would not keep on running.
After all that, I connected the fuel line on the carb and it started right up. 
All of the above are all cause I see with riders. Understanding that fluid is thicker than air . At the engine end the connection are usually higher that the tank , so no pressure to push out fuel . But the vacuum created by the pump will pull in air at week connection , plus any debris at the tank screen or in the line will only increase the air intrusion . This is also why I prefer to have a filter before the pump , if you need to pressure prime for any reason debris will not end up in your pump valves or carb .Eugen wrote: ↑Tue May 03, 2022 9:30 pm @MattA maybe, but I cranked it quite a while with the starting fluid, and while it would start, it would die shortly.
Besides Bob's good suggestion, there may have been another problem. Perhaps there's crud in the gas tank that gathered at the location where the gas leaves the tank to go down the hose. I never opened a Case GT gas tank so I have no idea what it looks like. On the bigger tractor there's a screen that can get plugged with crud. After I pushed air through the hose into the gas tank to bubble around the gas somewhat, and then also blew into it while closing the upper hole as much as I could, gas did come out the hose that goes to the carb. I guess I did push some gas right through the pump too.
@thebuildist I will replace the fuel line coming from the tank, as I do have some on hand and this must be as old as the tractor itself so , it makes sense to do it. Hopefully it'll solve the hard starting after the long sitting.