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Borderlands 4 Guide

How to Unlock The Legendary Flash Fuel Assault Rifle

Weapons
Legendary Loot
By Ratore
Updated on Sep 11, 2026
Sep 11, 2026

Overview

Flash Fuel is is a Jakobs AR.

Its special effect is Hot Flash - Damage scales with Heat. When Heat is greater than 50%, convert element to Incendiary.

How To Unlock

Unlock Location:

  • Activate the Warped & Weird Vault Card.
  • Earn Points by completing challenges and leveling up.
  • Once you have enough points you will be able to purchase the Flash Fuel from the Vault Card.

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Table of Contents

1. Overview2. How To Unlock3. Comments

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