Another advantage about an electric pump is that if you have to drain the tank again, you just unhook the fuel line from the carb and let the pump push the bad fuel out.
I never thought of that....sounds a little dangerous though (my luck the vapors would find some way to ignite).HE could also use compressed air ,take the hose off at the carb and apply air pressure at the gas cap carefully,NOT at full blast,and it'll blow the gas into a can ,but I'd do it outside if possible,since it'll make fuel vapors galore..