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The pump does not spin. There is a rubber gasket between tank and pump, and another between sending unit and pump, and both are secured with locking rings. You will struggle a little without 3 hands, but basically you hold the pump in place, hold the locking ring in place, and tap on the locking ring tabs with a screwdriver and hammer to rotate the tabs to the locked position. Then you gently tap the tabs so the ring won't turn.
This might help:
http://boblincoln.com/gastank/gastank.htm
This might help:
http://boblincoln.com/gastank/gastank.htm