Open the HDC-file in question, look for the lines 'FuelRange=(X,Y,Z)' and 'FuelSetting=(U)'
X and Y are usually 1 (minimum amount of fuel in the tank is 1 litre, and each click raises the amount by one litre), and Z is the number of increments (so if Z is 59 and X and Y is 1, you got 1 + (59 * 1) = 60
Make U the same as Z and yer good. Avoid racing online, as your gonna get booted.