 Additional fuel tanks were fitted and the design of the tanks was changed to accommodate the change from gasoline to kerosene . 
 Additional fuel tanks <a href='uninflect' title='1'><mark>were</mark></a> fitted and the design of the tanks was changed to accommodate the change from gasoline to kerosene . 
Additional fuel tanks was fitted and the design of the tanks was changed to accommodate the change from gasoline to kerosene .