Q: low fuel light comes on after filling up with gas on 2005 Buick Terraza

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After we fill up with gas the service engine light comes on,low fuel light appears and the tank continues to show that it is empty.
(1) Answer
what usually happens is that the fuel sender contact card will develop a film on it,especially when the tank is not completely filled up for a long time.we have this concern with cars on our used lot all of the time.when you fill up the sending unit contact comes in contact with the top part of the card that is filmed up and blam! gauge goes to zero,check engine light on.have the dtcs pulled.more than likely p0460-fuel level sending unit fault.alot of times putting a can of gas treatment in the tank will take care of it.if not you may need a sending unit.