Transfer Tanks

Shop fuel transfer tanks and diesel transfer tanks for pickup trucks and service vehicles from Upfit Supply. We carry RDS Manufacturing, Dee Zee, and Transfer Flow in aluminum and steel — from 35-gallon auxiliary tanks to 110-gallon L-shaped combo units that replace your spare tire well. Free shipping on every order.

Types of Transfer Tanks

• Rectangular Transfer Tanks — The most common configuration. Sit flat in the truck bed and are available in a range of capacities (35–100+ gallons). Aluminum options from RDS and Dee Zee. Steel options from RDS.
• L-Shaped / Combo Tanks — Wrap around the wheel well to maximize capacity without occupying the full bed. Often paired with a toolbox section in a single unit. Ideal for contractors and fleet operators who need both fuel and tool storage in the bed.
• Auxiliary Fuel Tanks — Designed to supplement (not replace) the OEM fuel tank. Gravity-fed or pump-assisted transfer to the main tank. Compatible with most full-size pickups and diesel trucks.

Transfer Tank Brands

• Weather Guard — Steel and aluminum transfer tanks in L-shape, rectangle, and column configurations. ARMOR TUF powder coat finish. 50–110 gallon capacity. Built for diesel and hydraulic fluid with a limited lifetime warranty. Shop Weather Guard transfer tanks →
• RDS Manufacturing — Made in the USA in both aluminum and steel. Steel tanks are a key differentiator — heavier and more impact-resistant than aluminum, preferred for high-abuse fleet environments. Rectangular and L-shaped combo configurations available. Shop RDS transfer tanks →
• ATI (Aluminum Tank Industries) — American-made from .125" diamond plate aluminum with a Severe Series option in .190" aluminum for maximum durability. DOT special permit covers gasoline, diesel, kerosene, methanol, and aviation fuel — the broadest fuel compatibility of any brand we carry. Shop ATI transfer tanks →
• Dee Zee — American-made aluminum and steel in rectangular and L-shaped configurations. Internal fuel baffles, DOT/FMCSA compliant. Shop Dee Zee transfer tanks →
• UWS — Aluminum and steel transfer tanks assembled in the USA. Rectangular, L-shape, and hammerhead styles. DOT-compliant for Class 3 combustible fuels (diesel). Not designed for auxiliary (plumbed) use. Shop UWS transfer tanks →
• Better Built — Heavy-duty 12-gauge steel transfer tanks at a pro-value price point. 50–200 gallon capacity, available with optional Fill-Rite pump packages. DOT-approved for diesel. Shop Better Built transfer tanks →
• Transfer Flow — Specializes in high-capacity fuel systems. If you're running a diesel work truck and need maximum range, Transfer Flow's systems are the category leader. Shop Transfer Flow →

Aluminum vs. Steel Transfer Tanks

• Aluminum: Lighter, naturally corrosion-resistant, won't rust if the coating is scratched. Best for contractors who move the tank between trucks or work in wet climates.
• Steel: More impact-resistant and typically lower cost. RDS steel tanks are a strong choice for high-use fleet applications where durability outweighs weight concerns.

Frequently Asked Questions

What size transfer tank do I need?

For most full-size pickup trucks, a 50–75 gallon rectangular transfer tank fits in a standard 6.5 ft or 8 ft bed without restricting access to the tailgate. L-shaped combo tanks in the 90–110 gallon range work best on 8 ft beds or service trucks. If you're running a crew cab with a 5.5 ft bed, look for a compact 35–50 gallon option.

Are transfer tanks legal to use on public roads?

Regulations vary by state and fuel type. Most states require DOT-approved tanks for transporting diesel on public roads. Transfer Flow tanks are DOT-approved where applicable. Check your state's requirements before purchasing a gas-only transfer tank for road use.

Do transfer tanks come with a pump?

It depends on the brand and model. Some RDS and Dee Zee tanks include a 12V electric pump; others are sold tank-only. Check the individual product listing — pump inclusion is always noted in the product description.

Can I use a transfer tank for diesel and gasoline?

Transfer tanks are typically rated for one fuel type. Using a diesel-rated tank for gasoline (or vice versa) can cause contamination and may void the warranty. Always confirm the fuel compatibility before ordering.