Quote:
Originally Posted by sdowney717
Use a vent valve. Has a ball float that seals off when tank is full
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THat method is certainly done for millions of on the road vehicles for the fuel system, and does have merit. A couple of fairly small downsides:
The "filler person" is alerted of a full tank only when the fill overflows, since there is no "smart" sensor in the hose, and no vent to look at. Usually, not an issue to have overflow water around the deck fill, unless its freezing out.
Second, if the tank is filled with water, and the float is floating, sealing off the system, any heating of the water in the tank (by engine or environment) could cause pressure to develop in the tank system. Possible to get a tank bulge, but would depend on the amout of any trapped air, which could be very low.