Fuel is an item for drilling in Ninja Fishing. All fish can be drilled, except the elusive Basilosaurus. A Treasure Chest can also be drilled.
Note: The player can only hold up to 300 fuel. The maximum amount is restricted and it cannot be greater than 300 fuel. The last 100 fuel can only be bought bundled with the Diamond Drill, for 1.99 USD.
Below is a table which includes fuel upgrades and their costs:
|100 Fuel||50 coins|
|125 Fuel||300 coins|
|150 Fuel||1,000 coins|
|200 fuel||2,500 coins|
|Diamond Drill/300 Fuel||1.99 USD|