Call or Text our US based team: 800-964-5341 Mon to Sun 9am-9pm ET
Call our US based team:
800-964-5341
Mon to Sun 9am-9pm ET
We offer a full line of Auxiliary Fuel Tanks for sale. Choose from sizes that start at 30 gallons and increase up to 110 gallons. We offer a variety of designs including rectangle, L Shaped, wedge, and low profiles.
Auxiliary fuel tanks allow you to transfer diesel fuel directly into your truck's factory gas tank. We do not sell Gas Auxiliary Fuel Tanks.
Not sure which tank is best for your truck?
The ATI aluminum diamond plate auxiliary tank transfers diesel fuel from your auxiliary tank directly into your diesel truck's fuel tank. Auxiliar...
View full detailsThe following section highlights a few our top diesel auxiliary fuel tanks. We offer options for both short and long bed trucks.
ATI's diesel auxiliary tank mounts directly to your truck bed.
Available sizes range from 38 to 46 gallons (ships by UPS).
Use the gravity feed fuel shotz kit to transfer diesel fuel directly to your truck fuel tank.
*43 gallon size is notched with a bottom tank length of 51 inches and a top length of 58 inches.
ATI offers larger in bed auxiliary tanks with sizes ranging from 51 gallons to 66 gallons.
Transfer diesel fuel using a gravity feed auxiliary fuel kit.
*51 gallon size has a 55 inch notched bottom length and 60" top length.
*58 gallon size has a 51 inch notched bottom length and 58 inch top length.
*62 gallon size has a 54 inch notched bottom length and 60 inch top length.
Transfer Flow's steel in bed auxiliary tanks included a highly advanced diesel fuel auxiliary system that will transfer fuel with an app from your phone.
Both sizes will fit under a standard tonneau cover.
Select the 40 or 50 gallon size for short bed trucks.
*The fill neck adds 2.5 inches of height to the top of the tank and is included in the listed height.
L Shaped auxiliary fuel tanks offer flexibility and additional fuel capacity. These tanks can fit under a bed rail toolbox.
You can also transfer diesel fuel to your truck fuel tank with the fuel transfer kit.
Drivers with a 5th wheel prefer wedge shaped auxiliary tanks because of the higher fuel capacity and the sloped design which provides better viewing the truck bed.
See our guide to the best Auxiliary Fuel Systems.
Unsure of the Best Tank Size? See our Auxiliary Tank Size List by Size & Brand:
