I went to switch the tanks I have my 2217 on and when I got it onto the other tank I turned it on and it wouldn't flow water. I've tried several different ways to prime it with no luck. Last thing I did was a drained all the water from the canister and hooked it back up opened the valve water started to run into the filter until it was full then reconnected the spray bar and turned it on and there was still no water coming out of it. I've checked for clogs everything seems fine I took it apart and cleaned the impeller and hoked it back up again, still no luck getting it to work. I then took the spray bar off and lowered the outlet hose to a bucket and water comes out. If I raise the bucket and hose up the water flow slows down and at the top of the tank the water flow stop. So my question is what could be the problem? I'm out of ideas.