The electric pumps can sometimes fail pretty quickly. Mine didn't last long at all. Also they can put out a good amount of pressure and can spew fuel all over the place. A couple of years ago I was having some trouble with a trainer that I had and one of the guys said "here, let me show you" and grabbed my plane and started pumping fuel with the electric pump. Well the fitting came out of the tube and sprayed fuel all over my face. Arrrrgggghhhh.... the dumb thing doused my eyes with fuel so bad I couldn't see. He grabbed my arm and lead me over to a water faucet and I rinsed them out. I eventually had to go home and rinse them in the shower for a while. Now adays when someone starts up those blasted things I steer clear of them. [>:] I think they were good back in the days but the crank type now are very good and safer to use and you won't use up your battery.