It does sit close to the tail shaft. Mine was rubbing on my last trip because my fuel tank copped a hit and it bent out a bit.
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Mine is on a GQ so it did not have a tank their from the factory.
I have a 2" lift and adding this fuel tank is one of the best mods I have done to the car.
When ever the time comes to do the big lap, then I'll be fitting a 150 ltr Brown Davis number.
but very happy with my range ATM, Brown Davis used the OE sender from the old OE sub tank.