the fuelbox|SKU:FTC44T-MS-var-57131-47fa4e

The Fuelbox Under Tonneau Fuel Tank Toolbox Combo

Maximize Bed Space Without Losing Tonneau Cover Functionality

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Price range: $2,388.75 through $2,635.50

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The Fuelbox Under Tonneau Fuel Tank Toolbox Combo
The Fuelbox Under Tonneau Fuel Tank Toolbox Combo
$2,388.75 $2,635.50Price range: $2,388.75 through $2,635.50

Maximize Bed Space Without Losing Tonneau Cover Functionality

The Fuelbox under tonneau tank toolbox combo is a vetted investment for diesel truck owners who refuse to compromise on bed space. Available in 40 gallon (short bed) and 55 gallon (long bed) capacities, this aluminum unit sits below the bed rails with a recessed lid, allowing your tonneau cover to operate normally. It clears most gooseneck and fifth wheel hitches while serving as an auxiliary or transfer tank. Every unit comes standard with a charcoal spray liner inside and out, reflecting the craftsmanship required for commercial-grade fuel storage. Ships free.

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Dual Toolbox Tank
Tonneau Cover Compatible
40 or 55 Gallon Options
Charcoal Spray Liner
40/55
Gallon Capacities
6.5' / 8'
Bed Length Options
2
Controller Options
The Fuelbox Under Tonneau Fuel Tank Toolbox Combo

Feature. . This ensures long-lasting durability and consistent performance in demanding conditions. Professional-grade materials and expert engineering come together to deliver a product you can rely on day after day, job after job. Every detail has been carefully considered to maximize your satisfaction and minimize downtime.

The Fuelbox Under Tonneau Fuel Tank Toolbox Combo

Feature. . This ensures long-lasting durability and consistent performance in demanding conditions. Professional-grade materials and expert engineering come together to deliver a product you can rely on day after day, job after job. Every detail has been carefully considered to maximize your satisfaction and minimize downtime.

The Fuelbox Under Tonneau Fuel Tank Toolbox Combo

Feature. . This ensures long-lasting durability and consistent performance in demanding conditions. Professional-grade materials and expert engineering come together to deliver a product you can rely on day after day, job after job. Every detail has been carefully considered to maximize your satisfaction and minimize downtime.

Verify Your Fitment

Confirm your truck bed size and tonneau cover style before ordering to ensure full compatibility.

  • Truck has a 6.5 foot short bed for 40 gallon or 8 foot long bed for 55 gallon
  • Tonneau cover sits above the bedrails for 40 gallon compatibility
  • If using a canister style cover (Retrax or Roll N Lock), truck must have an 8 foot long bed for the 55 gallon

Flexible Fuel Management

Use this versatile system exactly how your fleet demands.

On-the-Go Refueling
Equipment Transfer
Secure Tool Storage

Full specifications

At a glance

Dimensions
40 Gallon short bed, 55 Gallon
Full specifications6 data points across 4 categories

Dimensions

Size40 Gallon short bed, 55 Gallon
Compatible Bed Lengths6.5 foot short bed: Ford, GM, and RAM; 8 foot long bed: Ford, GM, and Ram

Power & Performance

Tank FunctionalityAuxiliary tank, transfer tank, or both

Materials

ConstructionAluminum
LinerCharcoal spray liner on the inside and outside of the tank

Compliance & Warranty

Hitch ClearanceClears most gooseneck and fifth wheel hitches

The Tank Vault Promise

We stand behind every product we carry because your operations depend on it.

Vetted QualityEvery Fuelbox tank is inspected to ensure it meets our commercial-grade standards before it reaches your facility.
Free ShippingYour investment ships completely free with no hidden fees or minimum order thresholds.
30-Day ReturnsIf this tank does not fit your exact specifications, return it within 30 days hassle-free.

The Fuelbox under tonneau tank toolbox combo is designed to fit under most standard tonneau covers.  The aluminum tank toolbox combo is available in 40 gallon or 55 gallon sizes.

If you have a short bed diesel truck with a tonneau cover, choose the 40 gallon size tank. Canister style tonneau covers are not compatible with the 40 gallon size.

If you have a canister style (retrax or roll n lock) tonneau cover with a long bed truck, choose the 55 gallon size tank.

The Fuelbox Under Tonneau fuel tank toolbox sits below the bed rails and the lid is recessed in so it can fully open with a tonneau cover. It clears most gooseneck and fifth wheel hitches. 

The Fuelbox under tonneau tank is a universal product that can be used as an auxiliary tank, transfer tank, or both. 

*Note: All Fuelbox tanks come standard with the charcoal spray liner on the inside and outside of the tank.

Recommended Tonneau Covers:

  • Tonneau covers that are designed to remain above the bedrails will be directly compatible with both sizes (Bak Industries / Bak Flip tonneau covers will be compatible).
  • Tonneau covers with a canister design (goes below the bedrail at the very front of the cab) will not be compatible with the 40 gallon tank size (Retrax & Roll N Lock tonneau covers).
  • If you have a canister style tonneau cover, the 55 gallon tank size will potentially fit if you have a long bed truck.

Note: You must measure your pickup bed with tonneau cover to guarantee clearance.

Under Tonneau Tank Toolbox Combo Features:

  • Constructed with .125 inch marine grade aluminum.
  • 90 degree flange reinforced seams which doubles weld joint thickness.
  • Stainless steel latch and lock assemblies with a continuous hinge that is the full length of the lid.
  • Weather tight seal with unique rain channel with neoprene on the lid.
  • Legal in all 50 states for diesel fuel only & meets DOT & EPA regulations. 

Tank Sizes (notched lower length):

  • 40 Gallon*: 62″L x 23″W x 17.5″H / fits short beds*
  • 55 Gallon: 62″L x 30″W x 17.5″H /  fits long beds

Both tanks have a 53 inch lower tank length.

*The 40 gallon size has a bottom tank width of 14 inches. The lower bottom tank width enables the 40 gallon size to fit short bed pickup trucks.

Toolbox Dimensions:

  • 40 Gallon: 62 inches long x 18 inches wide x 5.72 inches deep.
  • 55 Gallon: 62 inches long x 20 inches wide x 8 inches deep.

Under Tonneau Cover Tank Toolbox Spec Sheet:

FTC44T Under Tonneau Fuel Tank Toolbox Combo

40 Gallon: A: 17.5″, B: 23″, C: 62″, D: 53″, E: 5.75″
Mounting tabs add 2.5 inches to dimension D.
*Side dimensions for the FTC44T 40 gallon size. Fits short bed trucks with 14 inches of space before the wheel well.

FTC70T Under Tonneau Fuel Tank Toolbox Combo

55 Gallon: A: 17.5″, B: 30″, C: 62″, D: 53″, E: 8″, F: 10″
*Side dimensions for FTC70T 55 gallon size. This Fits canister style tonneau covers.

 

The Fuelbox can be used in two ways:

  • As an auxiliary fuel tank for your diesel pickup. Use the Auto Fuel Controller to transfer fuel to your pickup as you drive.
  • Use the optional transfer pump to transfer fuel from the Fuelbox to other vehicles and equipment.  The optional transfer pump mounts inside the tool box so it is secure and out of sight.

Vehicle Fit

The Fuelbox Fuel Tank Toolbox Combo Under Tonneau fits the following vehicles:

40 Gallon:

  • 6.5 foot short bed: Ford, GM, and RAM
  • 8 foot long bed: Ford, GM, and Ram

55 Gallon:

  • 8 foot long bed: Ford, GM, and Ram

Choose a Transfer Pump or the Auto Fuel Controller

Option 1: Use your Fuelbox as an Auxiliary Tank

Fuelbox Auto Fuel Controller (AFC) – Auxiliary Fuel System:

The AFC computer works in conjunction with the Fuelbox tank by automatically filling your main fuel tank when it gets low as you drive and shuts off when the main tank gets near full. The AFC monitors the stock OEM fuel tank.

When the stock tank gets near 1⁄4 of a tank it will turn on a transfer pump and transfer fuel from the auxiliary tank to the stock tank. The AFC will shut off the transfer pump when the stock tank is near full or the auxiliary tank is empty.

The AFC can be set for automatic operation or it can be manually turned off
from the cab of your truck. In addition there is a manual button, where you can manually transfer fuel for up to 4 minutes.

The Auto Fuel Controller (AFC) makes the Fuelbox tanks legal in all 50 states for diesel pickups. The AFC system meets or exceeds all DOT & EPA regulations. It also meets the standards required by the VESC-22.

Auto Fuel Controllers (AFC) systems are compatible for all Ford, GM and Dodge diesel pickups.

The Auto Fuel Controller is available in two models: Digital Display Controller or Plug & Play Controller.

  • Plug & Play Controller: plugs directly into your on-board diagnostic (OBD-II) port on your truck. This makes an easier install and avoids the factory wire harness. The plug and play shows the fuel level percentage in both the vehicle tank and the Fuelbox tank.
  • Digital Display Controller: is a vehicle specific controller that is programmed for the year and make of the vehicle. The Digital Display controller only shows the fuel level in the Fuelbox tank.

Option 2: Use your Fuelbox as a Transfer Tank with a Fuel Pump

The fuel transfer pump allows you to fill other vehicles and equipment. The transfer pump is a 13 gallon per minute pump with a 12 foot hose and an auto shut-off nozzle. 

Transfer Pump Accessories:

  • Filter Kit – Adds filtration to your transfer pump.
  • Fuel Meter – Logs how many gallons you transfer with the transfer pump.

Fuelbox Optional Accessories:

  • Tie down bar – add more mounting tie down points that are easy to reach.
  • Side bed step – mounts just behind the cab, providing a faster & easier way to reach your Fuelbox.

For more options see:

Additional information

Size

40 Gallon short bed, 55 Gallon

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About the fuelbox Fuel Tank Toolbox Combos

the fuelbox is a trusted manufacturer of premium fuel tank toolbox combos. TankVault is an authorized dealer offering the full the fuelbox lineup with free delivery, price match guarantee, and expert support.

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