This article is timeless and should be accurate for any version of the game.
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The Fuelrunner is a heavy Dunne rig designed to transport and distribute large quantities of Fuel.
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— In-game description
The Dunne Fuelrunner 2d is the WardenFuel Tanker. It is a logistical vehicle specially designed to transport large quantities of liquids (such as fuel) and refuel nearby vehicles and structures.
The Dunne Fuelrunner 2d has 1125 HP and is disabled under 87.5% health. It has "Unarmoured" resistance, even small arms fire and Flamethrowers are a danger to it. It takes 100 Basic Materials to fully repair it from 1% to 100% health with a Hammer. Its health can be instantly repaired at a Garage for 100 Basic Materials.
Interactions
The Dunne Fuelrunner 2d can be interacted with in a few ways:
Refuels nearby structures and vehicles - only applies to nearby entities (depending whether they have the correct fuel)
The structure/vehicle that wants to be refuel must click the refuel button - able to be canceled with another button
Visually shows refueling with a hose connecting them - will stop refueling if they are too far away
The driver can access the inventory and stockpile of nearby structures
Pulls items from stockpiles twice as fast compared to on foot
Can pull three times the normal amount - press Shift + LMB
The Dunne Fuelrunner 2d is an essential vehicle for Foxhole logistics as it's the few vehicles that can efficiently transport liquids from one point to another. While there are other structures and vehicles that can do this (and at a much higher capacity), it is far easier to move to locations and requires less infrastructure to do so.
Like all structures and vehicles that can refuel, it will keep track of how many liters was extracted from it (i.e. if there was 500L inside, and only 37L was extracted, it now has 463L stored inside). Although it has an internal counter, it is not visibly shown when looking in its inventory/stockpile.
Early-game Facility Logistics
Prior to Tier 2 Facilities unlocking (which includes pipes), Fuel Tankers are extremely useful for supplying liquids to facilities that need them, like the Diesel Power Plant. Using them also cuts down on unnecessary building, which increases msupp consumption. Depending on how long Tier 2 Facilities takes to unlock (which can take between 6-7 days to unlock), not building unnecessary things will reduce burnout of players maintaining them at the start of each war.
Trivia
Prior to their rework in Update 1.50 ('Inferno'), Fuel Tankers were the only mobile structure/vehicle in the game that could transport fuel. This was later changed with the introduction of the Liquid Container, which resulted in Fuel Tankers being nerfed.
It had 2 inventory slots, which could stack up to 100 per slot (giving it an effective carrying capacity of 20,000L).
The word, "Dunne", in the vehicle's name refers to the in-game automobile manufacturer who made the vehicle. This is only seen on Warden utility vehicles, as they only produce vehicles for the Warden faction and their armies.