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Hi my name is Robert...
IF it sat for that long I would drain all the fuel out and change the fuel filter, when the fuel sits that long it can cause all kinds of issues. The fuel can start to condensate and then turn to a slime. I would start with fresh fuel and a new fuel filter and go from there. On some tanks you will find a plug others do not have one and the fuel will have to be siphoned out, most auto parts stores will have the siphon pumps..... Hope this helps.... Robert