Water Pump Cycling On\Off
Last trip out the water pump on my Jayco White Hawk was cycling on and off, number of cycles increased as the fresh water tank emptied out. Less water in the tank the more often it would cycle. Found ...
Forum Discussion
SoundGuy wrote:It is impossible to leak air "into" a pressurized system; whatever is in the system will leak out, not the other way around. A leaking city water inlet valve will leak water "out", dribbling down the outside of the RV. And tank level will not affect it if that is occurring. The only way for air to get "into" a pressurized system is for there to be a leak in the line between the tank and pump (on the vacuum side), so that the pump is sucking air in.SoundGuy wrote:
Leaking city water inlet check valve is the most obvious place to start.Theb2b wrote:
I'll start here, not sure what I'm looking for but start the trace and see what I find.
Obviously you want to know if the city water inlet check valve isn't seating properly and therefore leaking air into the system. Simply seal it with a threaded water inlet plug and if solves your problem you've found the culprit. If not, continue looking at the rest of the system ... no magic here, you've got air leaking into the system somewhere.
However, a leak in the pump's check valve allows the pressure in the system to drop enough for the pump to cycle as the water leaks back into the tank. It's possible that a higher water level in the tank exerts a (slightly) higher the pressure on the tank side (in essence "pushing back" against the leak), explaining the higher rate of "cycle" as the tank level decreases. That (the differing cycle rate corresponding to differing tank level) is the clue that points to the pump check valve.
