FW tank fills when fw hooked up via hose.

dave17352 wrote:


Now did it solve it instantly or after a while? :)

You got me,dude. My kind of humor!

Water pump has an 'internal check valve' ---- a diaphragm ---- that seals off to stop backflow thru pump.

Also if you have a 'Fill' valve it can be leaking thru

Disconnect pump suction line and see if water runs out (back thru pump) when using city water.
If it does......install a in line check valve (Shurflo has them) in pump suction line ($10-15) Problem solved.

If no water ...then fill valve is leaking thru.

jjjandrbaker wrote:

RWjSIM2003 wrote:
you can also try running the pump for a while and sometimes that will free up the Check Valve in your water pump and stop the problem.

X2 I had the same problem once, and running the pump for a while solved it instantly.

Now did it solve it instantly or after a while? :)

RWjSIM2003 wrote:
you can also try running the pump for a while and sometimes that will free up the Check Valve in your water pump and stop the problem.

X2 I had the same problem once, and running the pump for a while solved it instantly.

you can also try running the pump for a while and sometimes that will free up the Check Valve in your water pump and stop the problem.

Look for a check valve in the 12 volt water pump. If you can disassemble, maybe just dirt in the valve. Replacement pump heads can be found on ebay if needed.