Air in the water lines, still

[jimocon]

Thanks Jeff & Sid for your help. Today we took the pressure off the
water hose by turning on the kitchen sink. Voila! Disconnected the
hose from the coach and didn't get a bath. Problem half solved.

We have air in the water lines again. We turned on the kitchen
faucet, bath sink, shower and flushed the toilet for 2-1/2 minutes.
It spit & belched & banged and made an awful racket. We have mostly
water now, but still enough burps to wreak havoc with the drinking
water filter.

The fill switch is off. The fresh water dump valve is closed. The
fresh water tank is half full.

Why do we get all this air in the lines when we move from one
campground (Wichita Falls) to another (Oklahoma City)?

Bring on all your ideas
Pen & Jim
'83 PT 35
Going to AAA ball game tonite.