Additional information
| Size | 51 Gallon Slim, 58 Gallon Low Profile, 62 Gallon, 66 Gallon |
|---|
ATI Diesel Aluminum Auxiliary Tank
Price range: $789.00 through $839.00
ATI Rectangular Diesel Aluminum Auxiliary Tank
Price range: $659.00 through $759.00
ATI Diesel Aluminum Auxiliary Tank — 51 to 66 Gallon Bed-Mount Fuel Capacity
Extend Your Driving Range with a Built-to-Spec Auxiliary Tank
Maximize your fleet’s range without sacrificing bed space. This premium ATI aluminum auxiliary tank delivers a lightweight, corrosion-resistant fuel solution engineered for seamless integration with your factory system. Built for the operator who demands reliable, extended hauling capability, it’s the straightforward upgrade for serious work.
- FREE Pre-offer Spec Review -- We verify bed fitment and compatibility before you order
- FREE Shipping -- LTL freight delivery to your location included
- 30-Day Returns -- Uninstalled tanks in original packaging accepted
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
- Aluminum auxiliary fuel tank
- 3/8″ NPT outlet fitting
- Vent with rollover protection
- Automotive style fuel cap
Extend Your Driving Range with a Built-to-Spec Auxiliary Tank
The ATI Diesel Aluminum Auxiliary Tank adds 51 to 66 gallons of fuel capacity to your truck bed, connecting directly to your factory fuel tank through the filler neck. This field-proven system keeps your factory tank full until the auxiliary is empty—no switches, no wiring. Constructed from heavy-gauge diamond plate aluminum with fully welded baffles to control slosh, every tank is spec'd for diesel applications. Available in four size configurations. Pay as low as $66/month with Affirm. Ships free.
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
51–66 Gallon Capacity
Rollover Vent Protection
Diamond Plate Aluminum
Direct Factory Fill Connection
51–66 gal
Available Capacities
3/8" NPT
Standard Outlet
4
Size Configurations
Spec'd Correctly for Your Bed Before It Ships
Ordering an auxiliary tank that doesn't fit your bed space wastes time and money. Tank Vault eliminates that risk with our free pre-offer spec review. Before your order ships, we verify your truck bed dimensions against the four ATI size options — from the 51-gallon slim profile to the 66-gallon standard. If the tank won't clear your toolboxes, bed rails, or fifth-wheel hitch, we catch it before it ships. No guesswork, no return freight claims, no lost days on the road. We spec it right the first time.
Diamond Plate Aluminum Built to Handle Real Road Conditions
These ATI auxiliary tanks are constructed from rugged diamond plate aluminum — industrial-grade material that handles rough job sites and highway miles without the corrosion issues of steel. Fully welded internal baffles reduce fuel slosh during acceleration, braking, and cornering, which adds structural integrity and keeps your fuel load stable. Every tank includes a vent with rollover protection and an automotive-style fuel cap. Available in black or white powder coat finish to match your rig or resist the elements. This is field-proven construction, not a thin-walled aftermarket add-on.
Direct Factory Filler Connection — No Wiring or Switches Required
The ATI Fuel Shotz diesel install kit connects your auxiliary tank to your factory tank through the factory filler neck, keeping your factory tank full until the auxiliary tank is empty. When your factory fuel gauge drops off full, you know the auxiliary tank is depleted. Installation takes less than an hour with no wires, no switches, and no splicing into your OEM fuel system. The system includes rollover protection on both the tank and the factory fill neck adapter. Your factory fuel gauge does all the monitoring — simple, reliable, and built to last.
Verify Your Bed Fitment
Measure your truck bed before ordering. The AUX51R (this SKU) has the dimensions below. Ensure available for your specific application.
- Bed length ≥ 55 inches for AUX51R
- Bed width accommodates 9-inch tank profile
- Factory filler neck accessible for direct connection
Built for the Long Haul
Fleet operations, long-distance hauling, and off-site work where fuel stops cost time and money.
Long-Haul Fleet Fueling
Remote Job Site Operations
Agricultural Field Work
Full specifications
At a glance
- Surface
- Black or white powder coated
- Warranty
- See product page
Full specifications12 data points across 4 categories
Dimensions
| AUX51R (51 gal) | 55"L x 9"W x 24"H |
|---|---|
| AUX58R (58 gal) | 51"L x 21"W x 13"H |
| AUX65R (62 gal) | 54"L x 21"W x 13"H |
| AUX66R (66 gal) | 55"L x 18"W x 17"H |
Power & Performance
| Fuel Type | Diesel |
|---|---|
| Outlet | 3/8" NPT |
Materials
| Construction | Diamond plate aluminum |
|---|---|
| Finish Options | Black or white powder coated |
Compliance & Warranty
| Vent Protection | Rollover protection |
|---|---|
| Baffles | Fully welded |
| Fuel Cap | Automotive style |
| Warranty | See product page |
The Tank Vault Promise
Every tank we sell is vetted for real-world performance. Here's what you get when you order from Tank Vault.
Specs Verified Before You OrderWe review your application and bed dimensions to confirm the right tank configuration before it ships.
Ships Free to Your DoorLTL freight delivery included on every order. Call for liftgate or job-site delivery options.
30-Day Hassle-Free ReturnsUninstalled, original packaging—contact us immediately if there's delivery damage and we resolve it.
Frequently Asked Questions
Yes. The ATI auxiliary tank connects directly to your factory fuel tank through the factory filler neck using the optional Fuel Shotz diesel install kit. No wiring, no switches, no splicing into your OEM fuel system. The factory tank stays full until the auxiliary tank is empty — your factory fuel gauge drops off full when the auxiliary is depleted. Installation takes less than an hour.
It depends on your bed length and what else you're carrying. The four ATI sizes range from the 51-gallon slim (55″L x 9″W x 24″H) to the 66-gallon (55″L x 18″W x 17″H). Contact Tank Vault before ordering with your truck model, bed length, and any obstructions like toolboxes or fifth-wheel hitches. We run a free pre-offer spec review to confirm fitment before the tank ships.
No. The Fuel Shotz diesel install kit is an optional accessory available on the product page. The tank itself ships with a 3/8-inch NPT outlet, vent with rollover protection, automotive-style fuel cap, and fully welded baffles. The install kit is required to connect the auxiliary tank to your factory filler neck and is sold separately. Add it to your order if you need the complete connection system.
Custom tanks are available upon request from ATI, but they are not standard configurations listed on this page. If your application requires non-standard bung placement, alternate dimensions, or specific fitting sizes, contact Tank Vault before placing your order. We coordinate custom factory-direct configurations with the manufacturer for non-standard applications. Standard orders ship as spec'd on the product page — custom requests will add lead time.
Every ATI auxiliary tank is constructed from rugged diamond plate aluminum and available with either a black or white powder coated finish. The powder coat provides additional corrosion resistance and a clean, professional appearance on the job site. Select your preferred finish option when placing your order. Custom finish requests are not standard — contact us directly if you need something outside the available black or white options.
Ships free via LTL freight to your location. Auxiliary tanks are large and ship on a pallet. Standard delivery is curbside — if you need liftgate service, job-site delivery, or inside delivery, contact Tank Vault before ordering to arrange those options. Lead times vary by size and finish selection. We provide tracking information once the tank leaves the warehouse.
This is an auxiliary fuel tank designed for in-bed mounting on pickup trucks, not a bulk transport or storage tank. It does not carry UL 142 or UL 2085 listings, which apply to aboveground bulk storage tanks. For regulatory questions specific to your state or application, contact Tank Vault before ordering. We provide honest guidance — if this tank doesn't fit your compliance requirements, we'll tell you upfront.
The Tank Vault Promise
Every tank we sell is vetted for real-world performance. Here's what you get when you order from Tank Vault.
Specs Verified Before You Order
We review your application and bed dimensions to confirm the right tank configuration before it ships.
Ships Free to Your Door
LTL freight delivery included on every order. Call for liftgate or job-site delivery options.
30-Day Hassle-Free Returns
Uninstalled, original packaging—contact us immediately if there's delivery damage and we resolve it.
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About aluminum tank industries Diesel Transfer Tanks
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