it blew my extra 15amp fuse. I ran it continuously for about 15 minutes while filling 4 tires on a Nissan Frontier truck. It stopped filling up with the preset, but I just kept working. Now I've turned it off between fills and no problems since. It inflated the tires very quickly, probably 2-3 minutes, taking each tire from 20psi to 40psi and stopping inflating at my preset pressure of 40psi. Overall I like this pump.