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:

Fuel Upgrade Cost
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