On Board Water Pump Question?

DutchmenSport wrote:

Old-Biscuit wrote:
You have a very small leak......small leak at a fitting on low point drain line...

Good observation. The low point drains are the one thing I've not considered. Still, if it was a leak, why does the pump cycle "only" when the water heater is on and water is hot. When cold, it doesn't do this. I would think the pressure would be the same with hot or cold water in the tank? Also, I've not noticed any loss of fresh water in the fresh water tank. Still, I'll check those low point drains. I am a firm believer in taking the least evasive action first. This one is simple to check. This does make sense, I have checked every nook and cranney. I've not found any leaks inside, no drips under the trailer, and no wet spots on the floor, or anywhere, except the low point??? Never thought of that. Still, only when water heater is hot... still puzzled. .. Thanks.

We're doing too much camping right now to mess with the water pump itself for that check valve. Once camping season slows down I'll check that out. I don't want to end up screwing something up and then have the camper out of commission while I figure out how to fix something I messed up. If the low point isn't the problem, check-valve is next.

Thanks again.

Water 'swells' when heated
Swell can increase pressure enough to weep from T&P, drip from hot low point or even push back thru pump
Doesn't take large quantity to drop pressure so one would not notice a change in fresh water tank level.

And adjusting pump pressure would just change 'where' it would cycle vs fixing the reason for cycling