I have a Long Ranger Tank with a facet pump for 3 years now
Done many river crossings, muddy bogs, Vic high country, desert etc without any problems. 
I carry a spare facet pump and an emergency siphon hose but never had to use them.
You do forget to turn it off, but the there is a common filler hub for the 2 tanks, so it simply drains back into aux tank when the main one is full. 
You might run the battery flat if you forget to turn it off for too long 

You hear the....tick tick ...sound of the pump once you turn the engine off when you are outside.
You do not hear it inside, soft noise.
I like the idea of knowing how much fuel I have left
regards
GD-4
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