I just bought a 1999 Coachman Mirada and we took it dry camping and we had no water flow. So when we came back I hooked up to city water hose and the flow was fine. So I bought a direct replacement Shur flow water pump and installed it and flow is still a dribble. I have checked for in line water filter and I cant find one. I have cleaned all the ariators in the fixtures. I am puzzled. I have good pressure when hooked up to city water so I know my water lines aren't blocked. I even turned on the pump for a minute while hooked up to city water lines and it increased the flow. What would you guys suggest I check next?