The fresh water pump in my new Solitude 369rl does not shut off most of the time. When it does shutoff it does so only after running for an extended period of time (3-5) minutes. It acts like their is air in the system somewhere and the pump cannot bring up enough pressure to shut off. I have drained the system multiple times including the water heater and swapped the water pump with a spare I carry with me. I have also connected the spare pump to the external input and pumped water into the system from an external tank with the system in pressure mode. The spare pump would not shut off in that mode either. Any suggestions on what to try next would be appreciated. I am dry camping and the nearest GD dealer is more than 100 miles away so am trying to resolve this on my own before biting the bullet and driving to the dealer.