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Old 09-16-2016, 02:55 PM   #11
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Join Date: Sep 2016
Posts: 9
I have narrowed things down. I ran a hose directly to the pump and into a bucket of water and to the interior plumbing. Absolutely no air! I ran the bucket into the main water system (through the exterior valves) and than it had air... so I bypassed the exterior valves and ran the water pump from the holding tank directly to the interior plumbing and there was no air.

Turns out, the valves on the outside of the trailer are somehow introducing air. The valves say fill/winter and main/winter or something along those lines. The valves are not leaking... but introducing air. This is on the pressurised side of the system.

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Old 10-06-2016, 11:59 PM   #12
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Just as an update, It turned out to be the 2 valves in the exterior "service box" that where sucking in air but not leaking water. I replaced them with brass valves instead of plastic and problem is solved! I have since installed a water hammer, insulated all of my piping and installed an adjustable pressure regulator.

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Old 10-07-2016, 12:22 AM   #13
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Location: Northern Colorado
Posts: 227
Sounds like at least one of those valves was the valve to switch the water pump to draw antifreeze during the winterization process. I have two valves that are utilized when winterizing my Wildcat. One valve bypasses the water heater and the other valve allows the water pump to draw antifreeze from a hose in the service area.

I have accidentally left the winterization valve for drawing antifreeze into the water pump in the wrong position in the spring and had the water pump sucking air like you describe. It was a head scratcher for a moment or two until I realized the valve was set incorrectly for the regular use of the water pump.

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