If you drive a Ford F150, F250, F350, or F450 pickup truck with a diesel engine and would like to expand your fuel capacity, this guide will help you pick the right sized auxiliary fuel tank for your truck bed.
Auxiliary fuel tanks offer extra fuel capacity to keep you on the road longer. They fit securely in the back of your truck bed and will directly transfer diesel fuel into your factory fuel tank.
Auxiliary fuel tanks can provide anywhere from 30 gallons to 100 gallons of extra fuel capacity for your truck. The main challenge is finding the right sized auxiliary fuel tank that will offer maximum additional fuel capacity while still fitting inside your truck bed.
This guide is organized into a few main sections:
- Auxiliary tanks for F250, F350, and F450 trucks.
- Auxiliary tanks for F150 trucks.
- Transfer tanks for F150 gas trucks.
Top Auxiliary Tanks for Ford Short Beds:
- ATI Auxiliary Tank (Ships by UPS): Click here to see it.
- Transfer Flow Auxiliary Tank: Click here to see it.
Top Auxiliary Tanks for Ford Long Beds:
- ATI Auxiliary Tank (66 Gallon): Click here to see it.
- Transfer Flow Auxiliary Tank (75 to 100 Gallon): Click here to see it.
Ford F250 F350 and F450 Auxiliary Fuel Tanks
If you have a short bed pickup, you need to pay close attention to the distance your wheel well is from the back of your cab.
- If the auxiliary tank width is less than the distance to your wheel well, you can fit an auxiliary tank with a length up to your bed rail width (60 to 65 inches).
- If the auxiliary tank width is greater than the beginning of your wheel well, then your auxiliary tank length is limited to the width between your wheel wells (50.5 inches).
*Always measure your bed space dimensions to double check the correct fit.
Key Measurements:
- Approximate bed width: 60 to 66 inches.
- Approximate wheel well width: 50.5 inches.
- Distance from wheel well to back of cab: 15 to 19 inches (varies by truck; important to double check this measurement on your truck).
Auxiliary Fuel Tanks for Ford Short Bed Trucks
ATI Auxiliary Tanks (Short Beds)
ATI makes a wide range of aluminum auxiliary fuel tanks. Fuel is transferred to your diesel fuel tank using the Fuel Shotz gravity feed system.
The Fuel Shotz system is an available option on the ATI auxiliary tank product page.
The 41 gallon size will fit any short bed since the length is less than the width between your wheel wells.
The larger 43 to 51 gallon sizes will fit as long as the tank width is less than the start of your wheel well.
The following tanks are designed to fit a Ford short bed truck:
- AUX41R: 41 Gallon - 48.5 inches long by 11 inches wide by 19 inches high
- AUX43R: 43 Gallon - 51 inches long (notched) by 12 inches wide by 16.5 inches high
- AUX46R: 46 Gallon - 57 inches long by 12 inches wide by 16.5 inches high
- AUX51R: 51 Gallon - 55 inches long (notched) by 9 inches wide by 9 inches high
See other 40 gallon auxiliary fuel tank options.
ATI Auxiliary Tanks (Long Beds)
- AUX66R: 66 Gallon - 55 inches long by 18 inches wide by 17 inches high
Compare all ATI auxiliary fuel tank options.
Transfer Flow Auxiliary Tanks (Short Bed)
Transfer Flow designs highly durable steel auxiliary fuel tanks with an advanced fuel transfer system that can be monitored on an app through your phone.
The 40 gallon size has a length of less than the width between your wheel wells, making this tank a great option for Ford short beds.
The 50 gallon size only works in a short bed if the distance to your wheel wheel is greater than 18.5 inches.
- Buy Tank: 40 Gallon: 48 inches long by 19 inches wide by 19.38 inches high
- Buy Tank: 50 Gallon: 60.75 inches long by 18.5 inches wide by 18.25 inches high
See Transfer Flow 50 Gallon Auxiliary Tank or compare 50 gallon auxiliary fuel tank options.
Transfer Flow Auxiliary Tanks (Long Bed)
The following auxiliary tanks will only work with a long bed Ford truck.
- Buy Tank: 75 Gallon: 60.75 inches long by 20.5 inches wide by 22.75 inches high
- Buy Tank: 100 Gallon: 60.75 inches long by 26.75 inches wide by 22.75 inches high
Fuelbox Auxiliary Tanks (Short Bed)
Fuelbox offers diesel aluminum auxiliary fuel tanks that feed diesel fuel directly into your factory fuel tank using the Fuelbox Auto Fuel Controller system that is mounted to your dashboard. You can also pair a transfer pump and a 2 inch bung to create an optional transfer tank.
- FT47: 40 Gallon: 62 inches long by 10 inches wide by 19.5 inches high
- FT50: 50 Gallon: 60 inches long by 16 inches wide by 15 inches high
Fuelbox Auxiliary Tanks (Long Bed)
- FT70: 68 Gallon: 48 inches (notched) long by 19 inches wide by 19.5 inches high
- FT90: 85 Gallon: 53 inches (notched) long by 25 inches wide by 19.5 inches high
Compare all Fuelbox tank sizes.
ATTA Auxiliary Tanks (Short Bed)
ATTA provides high quality aluminum diesel auxiliary fuel tanks with a proprietary Freedom Fill auxiliary fuel system that transfers fuel directly to your diesel fuel tank. The following tanks are designed to fit a Ford short bed pickup truck:
- AL40RU: 40 Gallon: 54 inches long by 10 inches wide by 18 inches high
- AT45RBR: 45 Gallon: 60 inches long by 12 inches wide by 15 inches high
- AT50RU: 50 Gallon: 60 inches long by 12 inches wide by 18 inches high
- AT50W: 50 Gallon: 60 inches long by 15 inches wide by 18 inches high
ATTA Auxiliary Tanks (Long Bed)
- AT80R: 80 Gallon: 60 inches long by 18 inches wide by 18 inches high
- AT99R: 99 Gallon: 60 inches long by 22 inches wide by 18 inches high
- AT110R: 110 Gallon: 60 inches long by 25 inches wide by 18 inches high
See more 100 gallon auxiliary fuel tank options for long bed trucks.
ATTA L Shaped Tanks (Long Bed)
- AT90L: 90 Gallon: 60 inches long by 30 inches wide by 18 inches high
- AT110L: 110 Gallon: 60 inches long by 34 inches wide by 14 inches high
Compare all ATTA Auxiliary Fuel Tanks.
Auxiliary Fuel Tanks for Ford F150 Pickup Trucks
Ford F150 pickup trucks have more limited pickup bed space than the larger sized 6.75 foot pickup beds. This means you need to limit your fuel tank length to less than 50.5 inches.
The following auxiliary fuel tanks require a diesel engine and will fit a Ford F150 pickup truck:
ATI Auxiliary Fuel Tanks for Ford F150
- AUX41R: 41 Gallon: 48.5 inches long by 11 inches wide by 19 inches high
Transfer Flow Auxiliary Tank for Ford F150
- Buy Tank: 40 Gallon: 48 inches long by 19 inches wide by 19.38 inches high
If you have a Ford F150 with a gas fuel tank, we recommend you consider a fuel transfer tank.
Fuel Transfer Tanks for Ford F150 Pickup Trucks
The following fuel Transfer Tanks are DOT approved to carry multiple fuel types and would fit inside a Ford F150 pickup bed:
- TTR38: 38 Gallon: 48.5 inches long by 11 inches wide by 19 inches high
- TTR43: 43 Gallon: 43 inches (notched) long by 12 inches wide by 16.5 inches high
- TTR50: 50 Gallon: 36.25 inches long by 19 inches wide by 19 inches high
- TTR55: 55 Gallon: 24.25 inches long by 24 inches wide by 24 inches high
Browse other 50 gallon transfer tank options.
How to Measure your Truck Bed for an Auxiliary Fuel Tank
It might seem strange at first, but your truck bed measurements for an auxiliary fuel tank are opposite of how you would measure your truck bed.
- The length of your auxiliary fuel tank equals the truck bed width.
- The width of your auxiliary fuel tank equals the truck bed length.
- The height of your auxiliary fuel tank equals the truck bed depth.
Ford Short Bed vs Ford Long Bed
- Short bed Ford pickups range from 5 foot 5 inch (65 inches) to a 6.75 foot (81 inches) bed length.
- Long bed Ford pickups have an 8 foot (96 inches) length.
Ford Pickup Truck Bed Specs:
Ford F150 5ft 5in Bed Specs
- Factory Fuel Capacity: 23 to 36 gallons
- Pickup Bed Wheel Well Width: 50.6 inches
- Pickup Bed Length: 67.1 inches
- Pickup Bed Height: 21.4 inches
Ford F150 6ft 5in Bed Specs
- Factory Fuel Capacity: 23 to 36 gallons
- Pickup Bed Wheel Well Width: 50.6 inches
- Pickup Bed Length: 78.9 inches
- Pickup Bed Height: 21.4 inches
Ford F150 8ft Bed Specs
- Factory Fuel Capacity: 23 to 26 gallons
- Pickup Bed Wheel Well Width: 50.6 inches
- Pickup Bed Length: 97.6 inches
- Pickup Bed Height: 21.4 inches
Ford F250, F350 & F450 6.75 foot Bed Specs
- Factory Fuel Capacity: 29 to 48 gallons
- Pickup Bed Width: 66.9 inches
- Pickup Bed Wheel Well Width: 50.5 inches
- Pickup Bed Length: 81.9 inches
- Pickup Bed Height: 21.1 inches
Ford F250, F350 & F450 8 foot Pickup Bed Specs
- Factory Fuel Capacity: 29 to 48 gallons
- Pickup Bed Width: 66.9 inches
- Pickup Bed Wheel Well Width: 50.5 inches
- Pickup Bed Length: 98.1 inches
- Pickup Bed Height: 21.1 inches
How to Measure Tank Space Around Ford Pickup Truck Wheel Wells
Ford truck wheel well width will reduce the maximum length of an auxiliary fuel tank. If your auxiliary fuel tank has a width that is less than the point where the tank first hits the wheel well, you can fit an auxiliary tank with a length that is greater than the width between the wheel wells.
A longer pickup bed length will give you more space in your pickup bed to fit an auxiliary fuel tank before the tank width runs into the wheel well base.
We have a few additional suggestions:
- Make sure to measure the space from the back of your pickup bed (behind the cab) to the point when you first hit the wheel well. This measurement in inches will tell you how much width your auxiliary tank can have before it hits the wheel well.
- If you have a short bed pickup truck, look for narrow auxiliary fuel tanks or narrow transfer tanks which have lower widths.
- You can also look for auxiliary fuel tanks with notches. The notches reduce the bottom length of a tank and are designed to fit between the wheel wells.
For more auxiliary fuel tank options, see our entire selection of Auxiliary Fuel Tanks for Sale.