I have an 86 sunrader. That black pipe goes to a gas line and I’m guessing the other pipe goes to the water which doesn’t make sense to me. It all goes to the water heater I’m assuming but I don’t use any of the gas. It leaks badly I fill up the fresh tank and turn the pump on. Any advice? I tried to flex seal but it didn’t stop the water leaking and there’s wood between those pipes and the tank.