Additional information
| Size | 80 Gallon |
|---|
ATI Rectangular Auxiliary Tank Toolbox Combo
Price range: $1,129.00 through $1,249.00
ATI Wedge Auxiliary Fuel Tank
Original price was: $855.88.$849.00Current price is: $849.00.
ATI 80-Gallon L-Shaped Auxiliary Diesel Fuel Tank
80-Gallon Diesel Range Extension for Toolbox-Equipped Trucks
Maximize your driving range without sacrificing bed space with the ATI L-Shaped Auxiliary Fuel Tank—engineered to integrate seamlessly beneath a crossover or chest toolbox. Designed for fifth-wheel compatibility, this premium aluminum tank connects directly to your factory system for a clean, professional installation. It’s the intelligent fuel solution for truck owners who demand both utility and extended range.
- FREE Freight -- LTL delivery to your site — call for liftgate options
- FREE Pre-offer Spec Review -- We verify fitment and compatibility before you order
$855.88
🔒 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 80-gallon L-shaped aluminum auxiliary tank
- Fill neck assembly
- Mounting tabs
80-Gallon Diesel Range Extension for Toolbox-Equipped Trucks
Increase your driving range with the ATI 80-gallon L-shaped auxiliary diesel tank. Built-to-spec from aluminum, this tank fits under most crossover-style toolboxes and provides available for 5th wheel applications. The field-proven design connects directly to your factory fuel tank via the ATI Fuel Shotz system, keeping your factory tank full until the auxiliary is empty. When your factory gauge drops from full, it is time to refuel. 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
Aluminum Construction
5th Wheel available
Toolbox Compatible
Fuel Shotz Ready
80 Gal
Fuel Capacity
48.5" x 28" x 26"
Tank Dimensions
<1 Hour
Fuel Shotz Install
Spec'd Right for Your Truck Before It Ships
The worst call you can make is telling your crew the new auxiliary tank doesn't fit under their toolbox or blocks the 5th wheel hitch. That's wasted money and a week of downtime. Tank Vault runs a free pre-offer spec review on every order — we cross-reference your truck bed, toolbox configuration, and hitch setup against the ATI 80-gallon L-shape dimensions including the 2.5-inch fill neck height and 1.5-inch mounting tab extensions. If the fit doesn't work for your application, we catch it before the tank ships. No guessing, no return freight claims, no crew standing around waiting.
Extended Range Without Losing Bed Space
The L-shaped profile is purpose-built for trucks that run a crossover-style or chest toolbox. The bottom section of the tank nests under most standard toolboxes, giving you 80 gallons of additional diesel capacity without sacrificing storage. At 48.5 inches long by 28 inches wide by 26 inches high, this tank maximizes fuel volume in the space your toolbox already occupies. The geometry also maintains available for most 5th wheel hitch installations, so you don't have to choose between towing capability and fuel range. Aluminum construction keeps weight manageable while providing field-proven corrosion resistance for long-term diesel exposure.
Factory Filler Connection Keeps Install Under an Hour
The ATI Fuel Shotz diesel install kit — available as an add-on — connects the auxiliary tank directly to your factory fuel tank through the factory filler neck. No in-tank pumps, no return line modifications, no splicing into your OEM fuel system. The system keeps your factory tank full until the auxiliary tank is empty, so you monitor fuel level on your existing factory gauge. When the gauge drops from full, your 80-gallon reserve is depleted. This approach means a straightforward installation in under an hour and zero interference with your vehicle's factory fuel delivery components.
Compatibility Check
Verify these conditions before ordering to ensure proper fitment in your truck bed.
- Bed height available of at least 26 inches for main tank body
- Standard crossover-style or chest toolbox installed in bed
- 5th wheel hitch configuration with adequate rear bed space
Built for the Road
This auxiliary tank is engineered for diesel trucks that work long distances and need to minimize fuel stops.
Long-Haul Fleet Routes
5th Wheel Towing
Remote Job Site Operations
Full specifications
At a glance
- Dimensions
- 28 inches
- Compliance
- See product page
- Warranty
- See product page
Full specifications11 data points across 4 categories
Dimensions
| Capacity | 80 Gallon |
|---|---|
| Length | 48.5 inches |
| Width | 28 inches |
| Height | 26 inches |
| Fill Neck Height Addition | 2.5 inches |
| Mounting Tab Extension | 1.5 inches to side and front |
Power & Performance
| Fuel Type | Diesel |
|---|---|
| Connection Method | Factory filler neck via ATI Fuel Shotz system |
Materials
| Construction | Aluminum |
|---|
Compliance & Warranty
| Compliance Documentation | See product page |
|---|---|
| Warranty | See product page |
The Tank Vault Promise
Pay as low as $72/month with Affirm. Every order ships free with full documentation support.
FREE Compliance DocumentationUL listing sheets, NFPA compliance certs, and EPA SPCC documentation included with every order — no chasing the manufacturer.
FREE Freight DeliveryLTL delivery to your site — call for liftgate, job-site delivery, or inside delivery options.
FREE Pre-offer Spec ReviewWe verify your application, jurisdiction, and compliance requirements before you order.
Frequently Asked Questions
The ATI 80-gallon L-shaped tank is designed specifically for crossover-style and chest toolboxes. The bottom of the L nests under most standard toolbox designs. However, exact fitment depends on your specific toolbox dimensions, truck bed width, and mounting position. Contact Tank Vault before ordering with your toolbox make and model — we run a free pre-offer spec review to verify available including the 1.5-inch mounting tab extensions and 2.5-inch fill neck height.
Yes. The L-shaped profile is engineered to provide available for most 5th wheel hitch installations. The tank's geometry routes around the hitch area rather than occupying the center rear bed space where 5th wheel hitches mount. If you have an aftermarket or non-standard 5th wheel setup, send us the specifics before ordering and we'll confirm fitment against the 48.5 by 28 by 26-inch tank dimensions.
Yes. The ATI L-shaped auxiliary tank requires the Fuel Shotz diesel install kit — sold separately as an add-on — to function. This kit connects the auxiliary tank to your factory tank through the factory filler neck without modifying your OEM fuel system. The tank alone does not include the plumbing, hardware, or connection components needed to transfer fuel. Add the Fuel Shotz kit to your order to complete the installation.
Lead times vary based on current inventory at ATI and your delivery location. Auxiliary tanks ship via LTL freight. If you have a specific deadline — seasonal work, a job site mobilization, or a fleet schedule — contact us before ordering with your required delivery date. We'll confirm availability and coordinate freight to your site. Ships free to any address in the continental United States.
Tank Vault offers a 30-day return window on uninstalled tanks in original packaging. If the tank arrives and the fitment doesn't work for your application, contact us immediately. This is exactly why we offer the free pre-offer spec review — to catch fitment issues before the tank ships and avoid return freight altogether. Measure your bed, toolbox, and hitch available before ordering, or let us verify it for you.
This is an auxiliary diesel fuel tank designed for on-road use in pickup truck beds, manufactured by ATI, an established producer of auxiliary fuel tanks. Specific regulatory requirements vary by state and application. If your operation requires particular certifications or documentation for your jurisdiction, contact us before purchasing and we'll help you determine whether this tank meets your regulatory needs.
The 80-gallon rating refers to the tank body capacity at 48.5 inches long by 28 inches wide by 26 inches high. The fill neck adds 2.5 inches of height above the tank body and the mounting tabs add 1.5 inches to the side and front — these are dimensional extensions for installation available, not additional fuel capacity. Actual usable volume should be confirmed with ATI's specification sheets.
The Tank Vault Promise
Pay as low as $72/month with Affirm. Every order ships free with full documentation support.
FREE Compliance Documentation
UL listing sheets, NFPA compliance certs, and EPA SPCC documentation included with every order — no chasing the manufacturer.
FREE Freight Delivery
LTL delivery to your site — call for liftgate, job-site delivery, or inside delivery options.
FREE Pre-offer Spec Review
We verify your application, jurisdiction, and compliance requirements before you order.
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