atta tank|SKU:AT45RBR-var-51055-effbb0

ATTA Below Bed Rail Diesel Auxiliary Tank — 45 to 92 Gallon, Tonneau-available Design

Diesel Auxiliary Tank Built to Clear Your Tonneau Cover

Below bed rail available — Sits fully below rails for tonneau compatibility
Three capacity options — 45, 68, or 92 gallons for your range needs
Rear fuel fill access — Driver-side rear corner for easy fueling
Full-size truck fitment — Long or short bed Ford, Dodge, and GM
  • FREE Freight -- Ships free to your location — call for liftgate or job-site delivery
  • FREE Pre-offer Spec Review -- We verify fitment for your truck bed before you order
  • FREE Fuel System Guidance -- Freedom Fill vs Push N Fuel selection support included

Price range: $1,045.00 through $1,511.00

30-day money back · No restocking fee

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Ships in 3–5 Days Heavy-duty crating included.
4.9/5 Stars 2,400+ verified reviews.

In the box

  • ATTA Below Bed Rail Tank (selected capacity)
  • Fuel fill neck (rear driver side)
  • Note: Freedom Fill or Push N Fuel System required — select at checkout
ATTA Low Profile Below Bed Rail Diesel Auxiliary Tank
ATTA Below Bed Rail Diesel Auxiliary Tank — 45 to 92 Gallon, Tonneau-available Design
$1,045.00 – $1,511.00Price range: $1,045.00 through $1,511.00

Diesel Auxiliary Tank Built to Clear Your Tonneau Cover

The ATTA Below Bed Rail Diesel Auxiliary Tank is a field-proven rectangular tank spec'd for full-size Ford, Dodge, and GM/Chevrolet diesel trucks. Designed to sit entirely below your bed rails, this built-to-spec tank maintains full available for hard or soft tonneau covers while extending your fuel range. Available in 45, 68, or 92-gallon capacities, it occupies just 12 to 25 inches of bed width. The rear driver's side fuel fill neck simplifies refueling with an open cover. Note: Requires selection of the Freedom Fill or Push N Fuel System at purchase.

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Below Bed Rail Design
45 to 92 Gallon Options
Ford, Dodge & GM Fit
Rear Driver Side Fill
45–92 Gal
Capacity Range
15 in
Tank Height
60 in
Tank Length
Spec'd Correctly for Your Truck Bed Before It Ships

Spec'd Correctly for Your Truck Bed Before It Ships

The worst outcome with an auxiliary tank is a unit that arrives and doesn't clear your tonneau cover or fit your bed length. That means downtime, return freight, and a crew waiting. At Tank Vault, we verify fitment for your specific truck cab, bed length, and cover type before the order ships. If you're running a short-bed GM with a hard folding cover, we confirm the 45-gallon configuration is spec'd correctly before you pay. No guessing, no return freight claims, no wasted days. The ATTA below bed rail tank sits entirely below your bed rails — but only if the right capacity is matched to the right truck. We make sure that happens.

Full Tonneau Cover Compatibility Without Modification

Full Tonneau Cover Compatibility Without Modification

The ATTA below bed rail tank is engineered so the highest point sits below your truck's bed rails. That means your hard or soft tonneau cover closes and seals without any cutting, spacing, or modification. The 45-gallon configuration is only 12 inches wide, leaving the majority of your bed floor open for tools and cargo. The 68-gallon version widens to 18 inches, and the 92-gallon expands to 25 inches — all maintaining the same 15-inch height and 60-inch length. Rear-mounted fuel fill on the driver side lets you fuel up without fully opening your cover every time. This is an industrial-grade auxiliary tank designed around the reality that working trucks carry more than fuel.

Diesel-Specific Fuel System Integration Required

Diesel-Specific Fuel System Integration Required

This tank is diesel-only and requires a dedicated fuel transfer system to operate. When ordering, you must select either the Freedom Fill Fuel System or the Push N Fuel System — both designed to integrate with the ATTA below bed rail tank. The Freedom Fill system automates fuel transfer from the auxiliary tank to your OEM tank, while the Push N Fuel system gives you manual control at the pump. Neither system requires drilling into your OEM tank. The tank is built to spec for full-size Ford, Dodge, and GM/Chevrolet diesel applications in both long and short bed configurations. Contact Tank Vault before ordering if you need help selecting the right fuel system for your truck.

Compatibility Check

Confirm your truck meets these requirements before ordering.

  • Full-size Ford, Dodge, or GM/Chevrolet diesel truck with short or long bed
  • Minimum 60 inches of available bed length
  • Hard or soft tonneau cover installed or planned for installation

Built For

Designed for diesel operators who need extended range without sacrificing bed cover functionality.

Long-haul fleet diesel trucks
Job-site trucks with tonneau covers
Agricultural operations with cover-protected beds

Full specifications

At a glance

Dimensions
45 Gallon, 68 Gallon, 92 Gallon
Warranty
See product page
Full specifications7 data points across 4 categories

Dimensions

45 Gallon15 inches high x 12 inches wide x 60 inches long
68 Gallon15 inches high x 18 inches wide x 60 inches long
92 Gallon15 inches high x 25 inches wide x 60 inches long
Available Sizes45 Gallon, 68 Gallon, 92 Gallon

Power & Performance

Fuel System OptionsSee product page

Materials

ConstructionSee product page

Compliance & Warranty

WarrantySee product page

The Tank Vault Promise

Every tank we sell is vetted for real-world performance. Here's what you can count on.

Spec-Verified Before It ShipsWe confirm your tank configuration matches your truck, bed size, and fuel system selection before processing.
Free Shipping to Your SiteLTL freight delivery coordinated to your location at no additional cost — call for liftgate or job-site delivery options.
30-Day Hassle-Free ReturnsIf it doesn't meet your spec sheet or arrives damaged, we resolve it immediately — uninstalled, original packaging.
★★★★★
“Went with the 45-gallon for my short-bed Silverado with a Retrax cover. Tank Vault confirmed the fitment before I ordered — it clears the rails with room to spare. Fuel fill in the rear corner is exactly where you need it. No bed space lost to speak of. Solid build, no leaks, and the Freedom Fill system transfers fuel without any issues. Wish I'd done this two trucks ago.”
F
First L.Dallas, TX

ATTA Low Profile Below Bed Rail rectangular tanks are designed to be used with a hard or soft bed cover. The highest portion of the tank will be below your bed rails for clearance of your bed cover.

The fuel fills will bed towards the rear of the tanks for easier fueling. The Below Bed Rail tanks are designed for full size Ford, Dodge, and GM/Chevrolet diesel trucks.

The ATTA Below Bed Rail Tank is a diesel auxiliary fuel tank available in sizes that range from 45 gallons to 92 gallons.

The rectangular below rail tank is designed to work with a hard or soft bed cover. The highest portion of the tank will be below the bed rails. The below bed rail tank will fit a long or short bed diesel truck.

The tank uses very little bed space at only 12” wide. The fuel fill neck is located in the  rear driver’s side corner for easier filling will an open bed cover. 

Note: You are required to choose the Freedom Fill Fuel System or the Push N Fuel System when purchasing a Below Bed Rail Diesel Auxiliary Tank.

If you choose the Freedom Fill Fuel System at checkout, you also need to select your vehicle make and model year. This allows the Freedom Fill system to be programmed to match the correct vehicle.

Below Bed Rail Diesel Auxiliary Sizes:

  • 45 gallon
  • 68 gallon
  • 92 gallon

Dimensions:

  • 45 gallon: 15 inches high x 12 inches wide x 60 inches long
  • 68 gallon: 15 inches high x 18 inches wide x 60 inches long
  • 92 gallon: 15 inches high x 25 inches wide x 60 inches long

Material:

  • .125 gauge aluminum / fully baffled

Fill Neck: 

  • Single fill neck / driver’s side (45 & 68 gallon sizes)
  • Dual fill neck / driver’s & passenger’s side (92 gallon size)

Fuel Type: 

  • Diesel fuel only

Bed Type: 

  • Short & Long bed: Ford, Dodge and GM

Notes:

  • Add 2.5” to the height of the tank for the fill neck/cap and sending unit cover. Add 1.5” (front & rear) to the width of the tank for the hold down tabs.  

 

Fuel System Options (Required to Select 1 Option) 

  • Choose either the Freedom Fuel System or the Push N’ Fuel System.

Freedom Fill Auxiliary System

The Freedom Fill Auxiliary System is the most popular fuel system option. It is a complete installation kit and comes with everything you need to install an auxiliary fuel tank to your truck.

The Freedom Fill Auxiliary System is specifically designed to be used in conjunction with an auxiliary tank manufactured by Aluminum Tank & Tank Accessories, Inc. for current year model Dodge, Ford, and GM / Chevrolet diesel trucks.

The Freedom Fill Auxiliary System is a computerized fuel system. When the factory tank reaches approximately 1/2 a tank, an auxiliary computer module will activate the fuel pump and begin transferring fuel from the auxiliary tank and will refill the factory tank to approximately 3/4 of a tank.

The system is all automatic for peace of mind and ease of use. The pump will not turn on when the auxiliary tank is empty.

Push N Fuel Auxiliary System

The Push N Fuel Auxiliary System is an economic fuel system. Designed specifically for use in an auxiliary tank manufactured by Aluminum Tank & Tank Accessories, Inc. for use in only in Dodge, Ford, and GM / Chevrolet diesel trucks.

The Push N Fuel System uses a momentary rocker switch mounted to the dash. The operator must push and hold the switch to activate the heavy duty rotary vain pump and hold the switch to activate the heavy duty rotary vain pump to begin the transfer of fuel from the auxiliary tank to the factory tank. When the switch is released, the pump will shut off.

Other Auxiliary Tank Options:

Additional information

Size

45 Gallon, 68 Gallon, 92 Gallon

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Frequently Asked Questions

The ATTA below bed rail tank is designed for full-size Ford, Dodge, and GM/Chevrolet diesel trucks in both long and short bed configurations. It works with hard and soft tonneau covers because the tank sits entirely below the bed rails. However, fitment depends on your specific cab size, bed length, and cover type. Contact Tank Vault before ordering with your truck details and we will verify the correct capacity for your setup.
The Freedom Fill Fuel System automatically transfers fuel from your auxiliary tank to your OEM tank, so you fill the ATTA tank and the system handles the rest. The Push N Fuel System gives you manual pump control at the dispenser. Neither requires drilling into your OEM tank. The right choice depends on how you prefer to manage fueling on your routes. Contact us with your truck and operating details and we will recommend the correct system.
The 45-gallon tank measures 15 inches high by 12 inches wide by 60 inches long. The 68-gallon tank measures 15 inches high by 18 inches wide by 60 inches long. The 92-gallon tank measures 15 inches high by 25 inches wide by 60 inches long. All three configurations share the same 15-inch height and 60-inch length — only the width changes with capacity. The 45-gallon option uses the least bed space at just 12 inches wide.
Installation requires mounting the tank in your truck bed and connecting the selected fuel system. If you have mechanical experience and the correct tools, self-installation is manageable. However, the fuel system connection involves your truck's diesel supply and must be done correctly to prevent leaks or air in the fuel line. Many fleet managers and operators prefer professional installation to ensure reliability. Contact Tank Vault if you need installation guidance or recommendations for your area.
The fuel fill neck is located at the rear driver-side corner of the tank. When you need to fuel up, you open your tonneau cover at the rear, access the fill neck, and refuel. You do not need to fully open or remove your cover. The rear placement was specifically designed for easier fueling access when using a bed cover. If your tonneau cover has a rear access panel, fueling is even more convenient.
Auxiliary diesel tanks like the ATTA below bed rail unit are designed for on-highway use in diesel pickup trucks when installed with the manufacturer's fuel system and per the included instructions. The tank itself is diesel-specific and intended for supplemental fuel storage, not for transport of fuel as cargo. Compliance requirements can vary by state. We recommend confirming with your local regulations or contacting Tank Vault for guidance specific to your jurisdiction and operating conditions.
Lead times vary based on the capacity and fuel system you select. Standard configurations typically ship within a few business days, but high-demand sizes or specific fuel system combinations may take longer. Since this is a freight-shipped item, transit time depends on your location. Contact Tank Vault with your desired configuration and delivery timeline before ordering. We will confirm availability and provide an estimated ship date so you can plan accordingly.
SKU: AT45RBR Categories: , , Brand:

The Tank Vault Promise

Every tank we sell is vetted for real-world performance. Here's what you can count on.

Spec-Verified Before It Ships We confirm your tank configuration matches your truck, bed size, and fuel system selection before processing.
Free Shipping to Your Site LTL freight delivery coordinated to your location at no additional cost — call for liftgate or job-site delivery options.
30-Day Hassle-Free Returns If it doesn't meet your spec sheet or arrives damaged, we resolve it immediately — uninstalled, original packaging.

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atta tank is a trusted manufacturer of premium diesel transfer tanks. TankVault is an authorized dealer offering the full atta tank lineup with free delivery, price match guarantee, and expert support.

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