Onboard water system pumps water out the shore input

[gdbudlong]

When I am not connected to a shore water line and I turn on the onboard pump to use the fresh water tank, water streams out of the shoreline input. It does not occur the other way around. In other words, when I am connected to shoreline water it is not leaking into the freshwater tank. Please help. Do I have a bad valve at the shoreline input where it says "Tank Fill" and "Tank Bypass"? Thank you.

[JK3045]

x4 on replace city outlet. Apparently there is a rubber o ring that becomes dislodged. Some people have had some success repairing , but I think last time I replaced ours it was about a $15.00 part and quite easy to replace on our coach

John

[2oldman]

Along with non-working tank gauges, everyone has this problem. Replace city water inlet.

[dahkota]

donn0128 wrote:
Bad check valve in the city water inlet

X2. We just had the same problem. Easy to replace.

[donn0128]

Bad check valve in the city water inlet

[Effy]

Why would you turn on the pump when connected to water? The pressure from the water connection means you don't need the pump.