Yes you can do that. I would run it very long that way. But you could do a tank let it sit and cool then do another and so on. I would be afraid of running it for a long period and burning it out. With that said I once had a mechanic who insisted I needed to drain a full tank of gas out of my baja. Mind you I just put the gas in two days before I needed service. He then tried to charge me for 5 hours labor at 135$ an hour to have his guy watch the pump. I really wanted to kill this guy. FYI this service was for a tuneup. Last time I used that mechanic and I made sure everyone on the lake new not to use him.