Originally Posted by PrairieBoy
The water pump is 1 of 40 issues with this trailer. It will be going back to the dealership immediately after we pull out of our seasonal site. I don't believe this is the cause of my problem. I never have air in the cold water side, only the hot water side which tells me that the air is most likely coming from the hot water tank but how.
I respectfully disagree.
The first issue is air dissolved in the campground water in your lines that is released over time. It collects in the only place it can; your hot water tank just as Twisty said.
The second issue is related to the first. As water trapped in the lines is heated by solar radiation, it has to expand. There is no place for it to go except compressing the air space in the hot water tank. The pressure relief valve in the hot water tank would open "eventually" but your weak check valve inside your water pump fails "open" and bleeds that water pressure into your fresh water tank.
When it cools down at night, you will have a LOT of air in your hot water heater since it will be sucking air through every valve in your camper (nature abhors a vacuum). Valve seals are designed to keep water in the pipe; not so much air coming the other direction when being sucked on. (cup shaped and water pressure from under the cup keeps the seal. Air can easily flow around the collapsed cup.)
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
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