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Diesel auxiliary fuel tanks from 30 to 80 gallons that ride in your truck bed and keep your factory tank full, so you drive farther between fuel stops. Diamond plate aluminum rectangle, wedge and L-shape tanks that meet DOT requirements for diesel auxiliary fuel tanks.
New to gravity feed? See how gravity feed fuel tanks work.
If you run long miles or work far from a fuel stop, a diesel auxiliary tank carries the extra fuel without changing how you drive. Our tanks from Aluminum Tank Industries feed your factory tank by gravity through its fill neck, with no pump, wiring or switches.
Drivers who cover long distances use an auxiliary tank to cut fuel stops and fill up where diesel costs less. Your factory gauge stays on full while the auxiliary tank feeds, so when the needle finally moves, you know the auxiliary tank is empty.
Each tank is built for the Fuel Shotz install kit, sold separately and matched to your truck's make and model year. The kit tees into your factory filler neck hose with a shutoff valve, and it does not void your truck's warranty. Shop fuel tank accessories.
Measure your bed with the mounting tabs and fuel cap in mind, check your payload, since a full tank adds real weight, and pick bright diamond plate or black powder coat. Driving a gas truck? Shop gasoline auxiliary tanks. Not sure which tank and kit fit your truck? Request a quote and we'll match them. Fueling equipment rather than your truck? Shop truck bed transfer tanks.