How to Change Fuel in Lightyear Frontier
Manage the fuel your mech can consume, protect crafting oils and distinguish fuel selection from world fuel-consumption settings.
Control the available fuel before looking for a selector
If the mech keeps consuming oil you meant to use for crafting, first manage which fuel items it can access in your inventory. Player reports describe automatic fuel selection and inconsistent expectations when several eligible fuel types are carried together.
No reliable dedicated fuel-selector workflow is established here. In particular, a community request for a separate fuel slot is not proof that such a slot exists in the current game.
Protect oils intended for another job
Before leaving the farm, store the oils reserved for construction, processing or a delivery. Carry the fuel you actually intend to use, then inspect the fuel display as you work. This is a more controlled experiment than carrying every available oil and guessing the priority order.
- Decide which items must remain available for crafting.
- Put those reserves in clearly labeled storage.
- Carry a small supply of the fuel you want to test.
- Observe which item is consumed as the current fuel supply changes.
- Recheck the inventory before taking a long trip.
Already active fuel may not change immediately just because another item becomes available. Do not discard valuable materials while trying to force an instant switch.
Do not rely on a universal priority list
Older reports disagree about the preference between oils, mixed fuels and Refillite. Different updates and carried inventories make a fixed priority list hard to apply confidently. Test the available items in your own build rather than assuming the mech always chooses the fuel you consider best.
If a setup consumes a resource needed for another system, reserve that resource before starting the job. The important goal is predictable use, not merely carrying the most valuable-looking fuel.
Settings and fuel choice are different
World settings can change fuel consumption and the consequences of running out. That does not select a particular oil for the inventory system. In co-op, the host controls the world's playstyle settings, so agree on the intended behavior together.
The 1.0 no-fuel behavior also differs from earlier explanations: running out applies a performance penalty rather than simply disabling all Mods outright. Inspect the current status before diagnosing poor performance as a broken upgrade.
Keep generator fuel separate
A combustion generator has its own supply needs. Carrying enough for the mech does not guarantee the farm stays energized, and reserving oil for the farm prevents the vehicle from using the same stock unexpectedly.
Read Energy planning for generators and upgrade installation if the mech still performs differently after refueling.