The fuel will have degraded quite badly despite the stabiliser.. This will be the root of your problem..basicaly your fuel fiter is cloged.there will have been water in the tank from hydroscopy.. change the fuel filter.. drain the tank at the same time.. do not store for long periods with large ammount of fuel in the tank..run till nearly empty. then put a can in when you need to start it then drive to the nearest gas station..Do you keep the battery on trickle charge..