I've been using a cheap Hobbico electric pump for years. I think it's almost 6yrs old. Still works fine. If I had to guess--I'd say close to 40 or 50 gallons of fuel.

http://www2.towerhobbies.com/cgi-bin...?&I=LXVZ41&P=0

I don't run it dry though. When it starts sucking bubbles, I shut it off. I see, and hear, guys running their electric fuel pumps dry all the time. We all know that sound when the pump is sucking bubbles--it speeds up and gets louder. They suck the tank down, and then get sidetracked or start BSing, and the pump sits there and screams it's guts out runing dry for 10 or even 20 seconds before they shut it down. Maybe that causes shortened lifespan on them. Or not. Who knows? [:-] I just don't see the point in trying to suck every last drop out of the tank. If there's 1/2oz of fuel left in the tank, and the pump can't forcibly suck it out through the clunk--then how on earth could it ever leak out and cause damage in the car or the house?

Mine works great though.