So, I have a 763 and the fuel guage is erratic and never truely worked. When I first bought hte machine (300 hours ago, now has 2000) occasionally it would sputter due to "fuel issue" (previous owners discription), well the issue seems to have gotten worse and now it is dying every 10 minutes or so (sucks fuel bulb FLAT). Wait 20 minutes and runs for 10 more, etc..... So, I think the float has disinegrated and blocking pick up tube. Any thoughts. I am hoping to NOT have t odrop the tank. How about a flush from bottom drain tube, new sending unit and clean screen. I read one other thread where the guy had to make a special wrench to reach it (no problem can forge weld etc..). Any help greatly appriciated. Ironwood