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My plan is to use a one-shot to power the circuit off of the house battery when it detects power on the sense wire. The one shot will power the circuit for approx 10 seconds. Even if the tank is "full" (e.g. the circuit "grounds" all of the sense wires) the timer in the one shot will still provide power for the 10 seconds.
This way the regulator on the Arduino won't be seeing 12V all the time (and thus not be consuming current). At the moment I'm estimating the circuit to consume less than 20ma while active and am looking for a one-shot that consumes ~0ma when not triggered.
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