Lol I hope I don’t wear out my welcome with all my tractor issues, but I have to go somewhere so here I am. after a lot of maintenance and electrical issues were finally solved more or less including a new fuel filter. I took the tractor out for a spin with a bush hog on the back not much grass to mow but I wanted to work the tractor to see how it was doing. It ran strong at good RPMs for about 20 minutes then started bucking/heaving and after a bit of that before I could get it to the barn it died…. it did this once before, with the original filter, which was quite filthy, and I was able to purge according to instructions of the manual, and it ran again. I‘ve started the Tractor dozens of times since and never had a problem until I worked it hard for 20 minutes.. don’t have a lot of experience with an issue like this, but as I pump the transfer lift lever I can see air pour into filter. I took the filter back off today cleaned everything as thoroughly as I could. I put a new O-ring on the drain plug on the bottom but I did not put a new O-ring on the bleed screw. I’m not sure if that’s pertinent or not. The fuel lines that attach to the filter like they have been on forever and are very tight. so from what I have read on the issue the trouble could be coming all the way from the fuel tank? could be the transfer pump, etc. is there a diagnostic device similar to soapy water to find a leaky tire to find out where the air is coming from? I also wonder if the new filter sit‘s tight on the 3 gaskets. If anybody has any suggestions on where to start, I would appreciate the information a great deal. Thanks, Danc