I'm not sure what your question is but I'll try to help a little anyway. No, there is no valve or anything to switch between city or tank. It is very possible that you have a crappy supply coming from the CG. If it's really bad, I would just fill the tank and turn on the pump and use the coach to supply your water. Are you using a pressure regulator or filter? both of those could also effect your pressure. I do not use a filter in mine. If you have a filter in, take it out and see what happens.
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