My auto Water Transfer from holding tank to Central Feed tank has worked like a champ until this AM, four hours before leaving for a two day trip. It never fails to happen when there is nothing you can do about it. It could be one of three things, in order of likelihood: Not enough "Head Pressure" (water in holding tank too low), kink in feed line between holding tank and Central Feed tank, or something blocking the Central Feed tank's float valve.
I expect it is likely a slight kink combined with lower head pressure. For this trip I will top off the Holding tank and will make sure there isn't a kink in the feed line. Worst case: The feed from holding tank to Central Feed tank stops again is no water from Central Feed tank. Each of the Grow tanks holds ~2gal of water when the Central feed tank's water level is at the top of the "stand pipe". The four plants are currently using ~one gal/day. So worst case: No water from holding tank for two days, the grow tank's water level goes down a gal., no a biggie for a day or two.
It is still a concern and something to worry about while we are camping.
I do my best thinking driving down the road and today was no different. The lid on the holding tank makes a good seal, feed a little water to central tank from the holding tank could make a vacuum which could reduce head pressure enough to stop filling of central tank.
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