There is currently a bug in Star Citizen that breaks your ability to refuel, rearm, and repair your ships. The cause is when your wallet amount goes over the 32-bit signed integer limit, the game internally wraps the value back into the negative range. For instance, if you have 2,147,483,648 aUEC it will wrap back to -2,147,483,648 aUEC.
The repair / rearm system reads this "wrapped" value internally, which is why you cannot repair or rearm. The pads and hangars basically see your wallet as a negative amount, and assuming you don't have enough funds to initiate the repairs.
This calculator will let you know the closest way back into the positive wrapped range, either by gaining an additional amount or getting rid of an amount of aUEC. In that previous example, simply giving away or spending 1 aUEC will put you back into the positive range.