[rwgregory]

Take off the gas cap and stick your nose in the tank. If it smells like dirty sweat socks, drain the tank. After this amount of time you may have water seperation or the gas may have started to turn to varnish. Either way, it's probably not something you want to run thru your engine. However, if you enjoy changing fuel filters, flushing fuel lines and rebuilding carburators, let 'er rip!