Ute or wagon mate? Wagons are about nearly 1/3 capacity of ute sub tanks. But 10-15 does sound pretty quick. I would think about 30mins+ easily for my wagon, I should time it when I next go for a long enough drive in it.
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I'm not sure about this, I haven pushed the switch several times when the tank been empty so maybe.
Try reseting the system by either disconnecting the battery or removing fuse 24 for 30 minutes and see how it goes.
When my sub light goes off indicating empty I can hit it again 4-5 times and it comes back on for a short while then goes dead till I fill her again. (Ute)