Diesel Fuel is the only resource in RUST that can be used to run the Giant Excavator monument machine.
Diesel fuel serves no purpose other than what is stated above. When inserted into the fuel hopper of the giant excavator and turned on, its sole function is to excavate and produce the resource set by the player until the fuel runs out. One diesel fuel can power the excavator for two minutes.
In addition to excavating the chosen resource, for every five diesel fuel burned in this way, the player is able to call in an airdrop, which provides additional loot benefits to visiting the monument.
Diesel may be purchased directly from the Outpost at the cost of 300 Low-Grade Fuel each or found at the oil rigs, junkyard, or dome monuments.
Check out our giant excavator guide if you are looking for more information about this monument.