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[seaottor1]

My fresh water by pass hook up that is supposed to by pass the fresh water holding tank is now filling it up. Does anyone know what could cause this problem?

[mmwjr]

The check valve that is suppose to close when connected to a hose staying open.

[seaottor1]

Is the check valve located in the pressure relief valve?

[mmwjr]

Originally Posted by seaottor1

Is the check valve located in the pressure relief valve?

Not familiar with your system but the check valve should be between the fresh water tank and where the dock hose fitting is plumbed into the cold line. I have seen the check valve built into this tee for the dock hose fitting.

[shrew]

I assume that the inlet from the shorewater connection T's into the water supply line just AFTER the pressure pump. The inlet to the pressure pump should have an inline filter. The outlet to the pressure pump should have a check valve. If there isn't one there, then install one.

[seaottor1]

There is one.

[mmwjr]

Originally Posted by seaottor1

There is one.

Then its leaking allowing water to flow back through the pump and into the fresh water tank.

[shrew]

Originally Posted by seaottor1

There is one.

I'll assume by "one" you mean check valve? If so, then it needs to be replaced.

[seaottor1]

I am assuming that the check valve in the fresh water pump is bad? The pump still works ok when it is pumping from the fresh water holding tank.

[mmwjr]

Originally Posted by seaottor1

I am assuming that the check valve in the fresh water pump is bad? The pump still works ok when it is pumping from the fresh water holding tank.

Remove the input hose to the water pump and turn the hose on. If water comes out the pumps input the check value is not working.