I have been going thru the same nonsense with my pump. It will not pump just off the battery though, I have hooked it up to a charger, whacked it, and then squirted wd-40 into it in order to get it going again. It will work for a while and then quit again. It has been irritating to say the least. I cannot remember how long I have had it but I am sure it has been less than 2 years, I guess it is time for an e-mail.