Air in the water system is not an uncommon problem. If you are experiencing air in the system it’s usually caused by a loose connection on the intake side of your pump, just like others have already stated. The screened filter on the intake side of pump is a common place to draw air, remove the filter cover, clean the threads and screw it in place securely, check the seal to make sure it’s in good condition and seated properly.
You should not have air in the system when hooked to city water. It’s a good practice to flush the hose and then leave it full when hooking to the coach.
I guess I’m pretty much just restating what everyone else has said.
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