Winnebago uses PEX hose clamps on the reinforced nylon flex that they run on both sides of the water pump, mine had minor leak, too. Replaced with really good stainless steel hose clamps, and could get them tight enough not to leak.
If I remember right, I put two wraps of black electrical tape around the fittings before pushing on the nylon flex tubing since the diameter of the nylon flex was a little bigger than the PEX that the fitting was intended for to help make it seal .
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Randy - Manhattan, Kansas
2015 Vista 27N
2020 Ford Escape Hybrid
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