First, the water pump output flow is NOT connected to the gray tanks except through the sink drain. So, a "leak" or "continuous running pump" can NOT put water into the gray tank through the plumbing. It has to go "through a faucet, into the sink and to the gray tank.
This is an "overly simplified diagram" of your water system. As you can see, there's no connection between the water pump and the gray tank.
Your problem is one of a couple of things.
First, the pump "pressure cutoff switch" is located in the pump head. If it is not working properly, the pump will run continuously.
Second, there is an adjustment on the switch (on some pump models) and you can vary the pressure at which the pump cuts off. It will only work IF the pump diaphragm can attain the set pressure. If there is "trash or a hole" in the pump diaphragm, it will not pressurize the cutoff switch, so it will run continuously.
Third, if you are connected to shore power, the converter should provide sufficient power to the pump for "normal operations". On the other hand, if you're on battery power, if the battery is not fully charged, it may not provide enough power to the water pump for it to run fast enough to attain the pressure setting. So, make sure your battery is fully charged or that you're plugged into shore power.
Fourth, if there is air in the faucet supply lines, the pump can not pressurize adequately, so the pump will run continuously, or for a significantly prolonged time.
Fifth, if there is an "air leak" in the pump supply line from the water tank to the pump inlet, you may be "sucking air into the pump diaphragm" which would cause cavitation in the pump and it will not fully pressurize the system.
I'd first make sure the power source is adequate, purge all the air out of the lines, verify the inlet hose to the pump is not leaking, make sure the pump diaphragm is clean and functional, then try adjusting the pressure setting.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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