My pump has an on/off switch in the cubby hole left of the steering wheel. When i flip the switch i can hear it running from my seat and it'll run for a while, maybe 1-2hours. Some times more some times less. The problem is it'll just stop running after a while. I've checked the fuses; ground wire; power wire; the on/off switch that it's hooked up to, you name it i've checked it and double checked it. Some times the very next day i'll flip the switch and it'll fire right up and some times it won't.