If you have tightened all the connections, it is probably bad. The internal seals go. It is not difficult to replace - if it is easily accessable. When Thor installed the water pump in my 2014 Vegas, they did not put a flexible hose between the pump and the plastic pipe. It says in big letters in the installation instructions not to hook the pump directly to the plastic pipe. The vibration destroys the internal seals. I installed a new one in the parking lot of an RV supply store. Only had to run in three more times to buy extra stuff for the installation. Good luck.
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