Additional information
| Size | 51 Gallon Slim, 58 Gallon Low Profile, 62 Gallon, 66 Gallon |
|---|
ATI Locking Auxiliary Fuel Tank Cap
$29.00
ATI Diesel Aluminum Auxiliary Tank
Price range: $789.00 through $839.00
ATI Diesel Aluminum Auxiliary Tank — 51 to 66 Gallon Capacities
Extend Your Driving Range with a Built-to-Spec Aluminum Auxiliary Tank
Maximize your fleet’s range and uptime with the ATI Diesel Aluminum Auxiliary Tank, a premium solution engineered for seamless integration. This lightweight, corrosion-resistant tank connects directly to your factory fuel system to dramatically increase driving capacity, allowing you to bypass fuel stops and stay on the job longer. Built for durability and backed by Tank Vault’s rigorous vetting, it delivers the reliable performance and compliance confidence your operations demand.
- FREE Pre-offer Spec Review -- We verify bed fitment and compatibility before you order
- Free Shipping -- Ships free to your location nationwide
- FREE Compliance Documentation -- Manufacturer documentation included with every order
Price range: $789.00 through $839.00
🔒 100% Secure Checkout
Free Returns 30-day hassle-free returns.
Free Delivery Every order, every time.
Ships in 3–5 Days Heavy-duty crating included.
4.9/5 Stars 2,400+ verified reviews.
In the box
- ATI rectangular auxiliary tank (selected size and finish)
- Automotive style fuel cap
- Vent with rollover protection
Extend Your Driving Range with a Built-to-Spec Aluminum Auxiliary Tank
The ATI rectangular aluminum auxiliary tank increases your fuel capacity and driving range by connecting directly into your factory filler neck. Built from heavy-gauge diamond plate aluminum with fully welded baffles to reduce fuel slosh, this tank is engineered for commercial-grade durability. Every unit is built-to-spec with a 3/8" NPT outlet, an automotive-style fuel cap, and a vent featuring rollover protection. Ships free with your choice of a black or white powder-coated finish. Pair it with the optional ATI Fuel Shotz diesel install kit for a fast, wire-free connection that keeps your factory tank full until the auxiliary is empty.
FREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORT
Rollover Protection Vent
Fully Welded Baffles
3/8" NPT Outlet
Direct Factory Filler Hookup
51–66 Gal
Available Capacity Options
9–21"
Width Range Across Sizes
< 1 Hour
Fuel Shotz Kit Install Time
Spec'd for Your Bed Before It Ships
Ordering the wrong tank size means wasted freight, downtime, and a tank that doesn't fit your bed. Tank Vault eliminates that risk with a free pre-offer spec review. Before your order ships, we verify your bed dimensions, mounting configuration, and fuel system compatibility against the ATI sizing chart. If the 51-gallon slim profile doesn't clear your toolboxes, or the 58-gallon low profile sits too high for your canopy, we catch it before the tank leaves the dock. No guesswork, no return freight claims, no lost days on the job.
Diamond Plate Aluminum Built to Last
These ATI auxiliary tanks are constructed from rugged diamond plate aluminum — lightweight enough to handle without a crew, but strong enough to handle the bed of a work truck. Fully welded baffles reduce fuel slosh during stops and turns, adding structural rigidity that extends tank life. Available in black or white powder coated finish to resist corrosion in wet or salty conditions. This is industrial-grade bed fuel storage, not a flimsy aftermarket add-on that cracks at the first weld seam.
Direct Factory Filler Connection — No Complex Plumbing
The ATI auxiliary tank connects directly into your factory fuel tank through the factory filler neck using the optional Fuel Shotz diesel install kit. This field-proven system keeps your factory tank full until the auxiliary tank is empty — you'll know it's drained when your factory gauge moves off full. Install takes under an hour with basic hand tools. Every tank includes a 3/8-inch NPT outlet, vent with rollover protection, and an automotive-style fuel cap as standard equipment.
Verify Your Bed Dimensions
Measure your truck bed space to ensure proper fitment. Select the size that matches your available available.
- Bed length accommodates 51 to 55 inches depending on selected tank size
- Bed width accommodates 9 to 21 inches depending on selected tank size
- Available vertical available accommodates 13 to 24 inches depending on selected tank size
Applications
Designed for diesel trucks requiring extended range for long-haul routes and remote job sites.
Long-Haul Fleet Operations
Remote Construction Sites
Agricultural & Farm Operations
Full specifications
At a glance
- Surface
- Black or white powder coated
- Warranty
- See product page
Full specifications10 data points across 4 categories
Dimensions
| AUX51R (51 Gallon Slim) | 55"L x 9"W x 24"H |
|---|---|
| AUX58R (58 Gallon Low Profile) | 51"L x 21"W x 13"H |
| AUX65R (62 Gallon) | 54"L x 21"W x 13"H |
| AUX66R (66 Gallon) | 55"L x 18"W x 17"H |
Power & Performance
| Fuel Type | Diesel |
|---|---|
| Connection Type | Factory filler neck |
Materials
| Construction | Diamond plate aluminum |
|---|---|
| Finish Options | Black or white powder coated |
Compliance & Warranty
| Safety Features | Vent with rollover protection |
|---|---|
| Warranty | See product page |
The Tank Vault Promise
We vet every tank for real-world performance so you don't have to gamble on your next equipment purchase.
Free Compliance DocumentationWe include all available manufacturer spec sheets and safety documentation with your order.
Ships Free to Your SiteUnconditional free shipping on this order. Contact us 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.
Frequently Asked Questions
ATI rectangular auxiliary tanks are designed to fit a range of truck bed configurations with four available sizes: 51-gallon slim (55"L x 9"W x 24"H), 58-gallon low profile (51"L x 21"W x 13"H), 62-gallon (54"L x 21"W x 13"H), and 66-gallon (55"L x 18"W x 17"H). Contact Tank Vault before ordering with your truck year, make, model, and bed length — we run a free pre-offer spec review to confirm fitment and identify any available conflicts with toolboxes, bed liners, or fifth-wheel hitches.
No. The ATI Fuel Shotz diesel install kit is sold separately as an optional accessory on the product page. The tank itself ships with a 3/8-inch NPT outlet, vent with rollover protection, and an automotive-style fuel cap. The Fuel Shotz kit provides the hose, fittings, and factory filler neck adapter needed to connect the auxiliary tank to your factory tank. It installs in under an hour with no wiring or in-cab switches required.
This ATI auxiliary tank is listed as a diesel auxiliary tank. The Fuel Shotz install kit referenced in the product description is specifically designed for diesel applications. Using an auxiliary fuel tank with the wrong fuel type can create serious safety and compliance issues. If you need a gasoline auxiliary tank, contact Tank Vault before ordering — we can confirm whether ATI offers a gasoline-rated configuration for your application or recommend an alternative.
Lead times vary by size and finish selection. Standard powder coat finishes in black or white typically ship faster than custom configurations. Contact Tank Vault with your selected size and finish preference and we will confirm the current lead time before you order. If you have a hard deadline — a fleet rollout, a seasonal operation start, or a job site mobilization — tell us upfront and we will verify the tank can arrive within your window.
This is an in-bed auxiliary fuel tank designed to extend driving range — not a DOT-rated transport fuel container. Compliance requirements for auxiliary tanks vary by state and application. Tank Vault provides all available manufacturer documentation with your order. For jurisdiction-specific questions about auxiliary fuel tank regulations in your state, contact us before purchasing and we will help you determine what is required for your operation.
ATI does offer custom tank configurations, but custom bung placement and non-standard sizes are not available through our standard online ordering. If your application requires a specific outlet location, additional fittings, or a modified dimension, contact Tank Vault before ordering. We coordinate directly with ATI for non-standard requests and will confirm feasibility, lead time, and any additional cost before you commit.
The Tank Vault Promise
We vet every tank for real-world performance so you don't have to gamble on your next equipment purchase.
Free Compliance Documentation
We include all available manufacturer spec sheets and safety documentation with your order.
Ships Free to Your Site
Unconditional free shipping on this order. Contact us 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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