GTBecker wrote:
wkearney99 wrote:
... I have to watch closely to make sure I shut the valve off before the tank gets overfilled...
What do you watch?
I can either watch the tank level sensor lights in the head or the actual level in the tank. I can do that by pulling out the drawer and resting a flashlight face-down onto the tank. That illuminates the tank well enough to be able to see the water level as it climbs. Otherwise I keep a sharp eye out at the vent line. But this is problematic in that it still overfills the tank with enough pressure to make it bulge a bit. Not a dangerous situation as it's just a polyethylene tank and can expand quite a bit. But it does have metal straps across it and I'd imagine those would bend if I let it get too stuffed.
Most of the time I just eye up the head tank level lights. Once it skips past the half-way light I usually just stop there. That's often enough water to handle our needs for weekend trips.
If I really wanted to be careful about it I could also open the bow fresh water filler fitting. That would allow the water to flow up and out there (onto the top deck) in addition to the vent line. That would totally prevent any tank expansion. Otherwise the only way around it would be to either install a larger vent line or limit the incoming flow rate to what the existing vent could handle. This would mean longer fill times.
Other than some sort of electronic valve I can't think of any way to have it work automatically.