wallaceb wrote:
Thanks KF4UPL and WCjeep. you've confirmed my suspicions. When I am dry camping (only on on board water)every 15 or 20 minutes the pump will "creep". That clue indicates a bad check valve. I wasn't sure but that is the only thing that makes sense. So new question becomes should I just cut a second check valve into the line or replace the pump?
If it's a diaphragm pump, trying taking it apart first. It's only 6 screws on mine. There may just be a piece of plastic stuck in it. If nothing else, work the rubber pucks a bit, turn them and see if it's any better. You've got nothing to lose.