fresh water tank

Our motorhome only has one check valve on the city water in line into the main supply line, there is no check valve after or before the water pump. Ours relies on the check valves inside the water pump to stop the city water pump from back-feeding into the fresh water tank, I have installed a gate valve at the bottom of the fresh water tank though so that I can clean out the water pump pre-screen without dumping the fresh water tank or flooding the rv. I would check the line between the tank and the pump, and the pump and the main water line of the motorhome

that tech just lost his job at mcdonalds on fri,and is now a major tech for CW.remember this when you need your rv worked on.

Agreeing with everyone else, bad tech, not a bad pump, sounds like he's more interested in Camping World selling you a new pump, and "Oh yah, while we were replacing the pump, we found a faulty check valve in the city water fill". :R

I agree bad tech advice. Check valve is sticking. Cheap and easy to replace, go to 'youtube' for a how-to demo.
or as Ed Gee suggests at the city inlet.
Could be either or .
check valve is on the inlet side of the water pump .

I'm 3 on the nutty techey. Pump has a check valve that gets stuck often. Don't run the pump with the city water attached. Even if the pump was bad it is rebuildable cheaply and easily.be sure the pump is not in Winterize mode for antifreeze filling.

Yes, agree that tech support is likely wrong. More often this issue is caused by a leaky back flow valve in the city water intake line.

Shut the city water off , turn on the water pump .If water runs then the pump is good ! I believe that tech support is nuts ! Do not tell any one I said that .