Best Aftermarket Gas Tanks For Trucks: Compare 10 Options

#1 · Best Overall

1. RDS MFG INC 71083

• Capacity: 45 gallons
• Material: Aluminum
• Weight: 42 lb

Best for: Welded aluminum transfer tank.

Why it ranks #1: Its 45-gallon aluminum tank has fully welded seams, and the listing permits gasoline auxiliary fueling when siphoned from the top with an electric fuel pump.

Fully welded seams and an aluminum body define this 45-gallon RDS auxiliary/transfer tank. RDS describes the aluminum as rust-resistant, while the welded construction supplies a clear durability feature for buyers seeking a rectangular fuel tank.

The 45-gallon capacity provides a substantial auxiliary reserve, and fully welded seams are the stated construction feature intended for durability. Aluminum avoids rusting according to the product listing, a practical consideration for a tank carried in a truck bed. RDS says its auxiliary tanks connect to the vehicle’s fuel tank and diesel can gravity-feed from the bottom. Gasoline auxiliary fueling is allowed when siphoned from the top with an electric fuel pump.

Skip it if you want a lockable steel tank with an automatic pump shutoff; the Better Built 29211584 lists both features.

This RDS suits truck owners seeking a 45-gallon aluminum auxiliary or transfer tank with fully welded seams. Consider its fuel-specific transfer guidance: diesel can gravity-feed from the bottom, while gasoline requires top siphoning with an electric pump.

Listed on Amazon as: RDS MFG INC 71083 Rectangular Auxiliary/Transfer Fuel Tank – 45 Gallon Capacity

#2 · Best Steel Tank

2. Better Built Steel Transfer Tank

• Capacity: 36 gallons
• Material: Alloy Steel
• Weight: 40 lb

Best for: Lockable steel transfer capacity.

Why it ranks #2: The 36-gallon alloy-steel tank includes a mounting kit, baffles, a lockable cap and an overfill restriction for its stated transfer-tank use.

An automatic overfill shutoff at the pump is the defining convenience of this Better Built 36-gallon steel transfer tank. It can help limit spills during filling, while built-in baffles are intended to strengthen the tank and keep contents from shifting during transport.

The 36-gallon capacity provides a substantial transfer-tank reserve, and the overfill restriction automatically shuts off at the pump to help prevent spills during filling. Built-in baffles add strength and restrict movement of the contents on the road. Flush-mounted, two-inch inlet and outlet bungs support fast flow, while the included vented lockable cap adds a security measure. The alloy-steel construction and 40-pound listed weight are relevant when planning placement and mounting.

Skip it if you need an aluminum tank; the RDS MFG INC 71083 is a 45-gallon aluminum alternative with fully welded seams.

This Better Built tank suits truck owners who want 36 gallons, baffles, and an automatic overfill restriction for transfer work. Account for its 40-pound listed weight and alloy-steel construction when planning placement and mounting.

Listed on Amazon as: Better Built Steel Transfer Fuel Tank – 36-Gallon, Rectangular, Black, Model Number 29211584

#3 · Best Baffled Tank

3. Dee Zee DZ92556NSB

• Capacity: 128 liters
• Material: Alloy Steel
• Weight: 70 lb

Best for: Baffled steel bed transfer tank.

Why it ranks #3: This 42-gallon steel transfer tank has five stability baffles, mounting tabs, a drain plug and a three-year limited warranty.

Five stability baffles give the Dee Zee DZ92556NSB a specific advantage for carrying liquids in a 42-gallon truck-bed tank. Its 14-gauge steel body and radius-curve design also address construction, with the curved form intended to eliminate weld pressure points.

The 42-gallon capacity offers a substantial supply for transporting non-flammable liquids, while five stability baffles help steady the contents in transit. Dee Zee says the radius curve eliminates key weld pressure points, and the steel receives a black NRT rust-inhibitor powder-coat finish. Mounting tabs secure the tank to the truck bed; a drain plug supports draining, and the stated 59.5-inch width and 70-pound weight matter for installation planning.

Skip it if you need an aluminum tank with an integrated toolbox and pump; the Vigorighter 51-gallon combo includes both.

This Dee Zee fits buyers transporting non-flammable liquids who value baffles, mounting tabs, and a drain plug. Plan for its 59.5-inch width and 70-pound listed weight when preparing the truck bed for installation.

Listed on Amazon as: Dee Zee DZ92556NSB Transfer Tank

#4 · Best Pump System

4. TITAN Fuel 5410050

• Capacity: 50 gallons
• Material: Plastic
• Weight: 68 lb
• Compatible with Vehicle Type: All of the above

Best for: Cab-controlled diesel transfer.

Why it ranks #4: The 50-gallon in-bed diesel system pumps fuel into the truck’s main tank with an electric pump and a cab push-button controller.

A push-button controller in the cab operates the electric pump on this TITAN Travel Trekker, making its transfer workflow a key distinction. The controller also serves as a fuel-level gauge, while the in-bed auxiliary tank is described as fitting under most bed covers.

The 50-gallon capacity provides auxiliary diesel storage, and the electric pump transfers fuel into the truck’s main tank. Operating that pump through a cab-mounted push-button controller lets the driver control the stated transfer process from inside the cab; the same controller acts as a fuel-level gauge. TITAN describes the tank as a sleek in-bed system that fits under most bed covers, a useful consideration for owners planning storage beneath a cover.

Skip it if you need a listed gasoline-capable tank with an integrated toolbox; the Vigorighter 51-gallon combo is specified for gasoline, diesel, and kerosene.

This TITAN suits diesel users who want an in-bed reserve, electric transfer to the main tank, and cab controls. Its stated use is diesel transfer, and under-cover fit is described as applying to most bed covers.

Listed on Amazon as: TITAN Fuel Tanks Titan Fuel 5410050 50 GAL Fuel System

#5 · Highest Capacity

5. RDS MFG INC 70326

• Capacity: 69 gallons
• Material: Aluminum
• Weight: 16 oz
• Compatible with Vehicle Type: Multiple vehicle types

Best for: High-capacity auxiliary fuel storage.

Why it ranks #5: Its 69-gallon aluminum capacity is the largest listed; the product description says diesel can gravity-feed from the bottom, while gasoline requires top siphoning.

The 69-gallon capacity is the defining advantage of this RDS aluminum tank, giving truck owners a substantial auxiliary fuel reserve. Its 57-by-18-by-16-inch rectangular dimensions provide a concrete starting point for planning bed placement, while the listed compatibility covers multiple vehicle types.

Aluminum construction keeps the tank material distinct from the steel options in this roundup, and the 69-gallon capacity gives it room for a sizable fuel reserve. Its 57-by-18-by-16-inch dimensions help buyers assess whether the rectangular form can fit their available mounting area. RDS says diesel can gravity-feed from the tank’s bottom; gasoline auxiliary fueling is permitted when fuel is siphoned from the top with an electric fuel pump, so the method depends on fuel type.

Skip it if you need a complete gasoline-pumping setup in the tank package; the listed gasoline method requires an electric fuel pump.

Choose this RDS tank if your truck setup can accommodate its 57-by-18-inch footprint and you value a 69-gallon aluminum reserve. Gasoline use has a specific top-siphon and electric-pump requirement; diesel gravity-feeding is described separately.

Listed on Amazon as: RDS MFG INC Rectangular Auxiliary Fuel Tank – 69 Gallon

#6

6. Vigorighter 51-Gallon Combo

• Capacity: 51 gallons
• Material: Aluminum

Best for: Fuel-and-toolbox bed combo.

Why it ranks #6: The 51-gallon aluminum unit combines a built-in toolbox with a 12 GPM 12V DC pump, hose and auto nozzle, though buyers must follow its pressure-relief instructions.

A built-in toolbox paired with a 51-gallon fuel tank lets this Vigorighter combo carry tools and fuel in one truck-bed unit. The aluminum construction and compact listed footprint support buyers who want to combine storage functions rather than allocate space to separate equipment.

The 51-gallon tank is paired with a 31-by-19-by-8.8-inch toolbox, providing separate stated space for tools within the combo. A 12-volt DC pump rated at 12 GPM, 13-foot hose, and automatic nozzle support fuel transfer without requiring buyers to assemble those listed components separately. The aluminum body is described as corrosion-resistant. During pumping, the pressure-relief valve must be open to prevent vacuum collapse; the guidance also calls for periodic opening during long-term storage.

Skip it if you need a bare transfer tank without an integrated toolbox and pump; the Dee Zee DZ92556NSB lists a tank, baffles, and drain plug.

Pick this Vigorighter combo if you want 51 gallons, tool storage, and a listed pump-and-hose setup in one unit. Keep the pressure-relief valve open during pumping and periodically open it during long-term storage.

Listed on Amazon as: 51 Gallon Aluminum Fuel Transfer Tank Toolbox Combo with 12 GPM 12V DC Pump, Truck Bed Gas Tank for Gasoline Diesel Kerosene, 13Ft Hose, Auto Nozzle, Black

#7

7. RDS MFG INC 71804

• Capacity: 37 gallons
• Material: Aluminum
• Weight: 77 lb
• Compatible with Vehicle Type: Car

Best for: 37-gallon aluminum auxiliary reserve.

Why it ranks #7: This 37-gallon aluminum auxiliary tank measures 50 by 20 by 9 inches and lists gasoline use only with top siphoning and an electric fuel pump.

A 37-gallon capacity in an aluminum body makes this RDS tank a middle-capacity auxiliary option for buyers comparing rectangular truck tanks. Its listed 50-by-20-by-9-inch dimensions let owners evaluate the footprint before allocating bed space.

The aluminum construction and 37-gallon capacity make this tank a defined option for auxiliary fuel storage, while the 50-by-20-by-9-inch dimensions support practical space planning. RDS says auxiliary tanks connect to a vehicle’s fuel tank and that diesel can gravity-feed from the bottom. For gasoline auxiliary fueling, RDS specifies siphoning from the top with an electric fuel pump, so gasoline use involves that particular transfer method.

Skip it if you need a larger stated reserve; the RDS MFG INC 70326 holds 69 gallons and also uses aluminum construction.

Choose this RDS model if 37 gallons and its 50-by-20-inch footprint suit your auxiliary-fuel needs. Diesel gravity-feeding is described by the manufacturer; gasoline use requires top siphoning with an electric fuel pump.

Listed on Amazon as: RDS MFG INC Auxiliary Fuel Tank 37Gal – 71804

#8

8. TITAN 7020217 Replacement Tank

• Capacity: 55 gallons
• Material: High Density Polyethylene (HDPE)
• Weight: 65 lb
• Compatible with Vehicle Type: All of the above

Best for: Ford Super Duty range upgrade.

Why it ranks #8: It upgrades specified 2017–2024 Ford F-250 and F-350 Crew Cab short-bed trucks to 55 gallons, but excludes cab-and-chassis models.

The 55-gallon capacity is 21 gallons larger than the stated stock 34-gallon tank, giving this TITAN replacement a clear range-oriented purpose. It is specified for 2017–2024 Ford F-250 and F-350 Crew Cab pickups with short beds and Power Stroke engines.

This mid-ship replacement uses the truck’s stock/OE sending unit, connecting the larger tank to the listed original-equipment setup. TITAN says it is compatible with Fleece, AirDog, and FASS systems, and that it will not interfere with powered steps, airbag systems, and most other accessories. The 55-gallon capacity adds 21 gallons over the stated stock tank, but the fit is limited to the specified Crew Cab short-bed pickup configuration and excludes cab-and-chassis models.

Skip it if you have a cab-and-chassis truck or a different bed configuration; this tank is for specified Crew Cab short-bed pickups.

This TITAN replacement suits owners of the specified 2017–2024 F-250 or F-350 Crew Cab, short-bed, Power Stroke pickups seeking 55 gallons. It does not fit cab-and-chassis models, so the stated configuration is essential.

Listed on Amazon as: TITAN Fuel Tanks 7020217 XXL Replacement Diesel Fuel Tank for 2017-2024 Ford F-250 & F- 350Crew Cab, Short Bed – 55 Gallon Capacity

#9

9. STMGW 45-Gallon Tank

• Capacity: 45 gallons
• Material: Aluminum
• Weight: 40 lb
• Compatible with Vehicle Type: Truck

Best for: Narrow aluminum bed footprint.

Why it ranks #9: The 45-gallon aluminum tank is listed for truck use and measures 57 by 9.5 by 20 inches, but the supplied details do not clarify its transfer setup.

At just 9.5 inches wide, this 45-gallon STMGW aluminum tank offers a notably narrow rectangular profile. That dimension can help buyers evaluate whether its 57-inch length and 20-inch height suit a truck-bed mounting arrangement where width is a key constraint.

The 45-gallon capacity provides auxiliary liquid storage, while the 57-by-9.5-by-20-inch dimensions make the tank’s space requirements clear for bed-layout planning. Its aluminum construction is described as corrosion-resistant and lightweight, useful considerations for a truck-mounted tank. STMGW lists fuel storage and transfer applications, but the supplied details do not specify a pump or a transfer-control method, so buyers should base workflow plans on the stated application and dimensions.

Skip it if you want a listed electric pump and cab controls; the TITAN Fuel Tanks 5410050 specifies both for diesel transfer.

Consider the STMGW if a 45-gallon aluminum tank with a 9.5-inch width matches your truck-bed layout. Its dimensions support space planning, but the supplied details leave the transfer interface unspecified.

Listed on Amazon as: Aluminum Rectangular Liquid Tank, 45 Gallon Capacity, 57 × 9.5 × 20 inches

#10

10. Dorman 576-343

• Capacity: 25 gallons
• Material: Metal
• Weight: 0.27 g
• Compatible with Vehicle Type: Chevrolet and GMC

Best for: Specified Chevrolet and GMC replacement.

Why it ranks #10: This 25-gallon tank is a direct replacement for specified Chevrolet and GMC vehicles, not a truck-bed auxiliary or transfer tank.

Direct replacement fit for specified vehicle years, makes, and models is the key purpose of this Dorman 25-gallon tank. Rather than serving as an in-bed auxiliary reservoir, it is a replacement part intended to match the original tank’s fit and function.

Dorman describes this metal tank as a direct replacement for the original on specified vehicles, making application matching central to the purchase. Its 25-gallon capacity and Chevrolet and GMC compatibility listing identify the broad vehicle categories provided, while the product details emphasize fit and function matching. The package includes a fuel tank, lock ring, and O-ring. Dorman also says its fuel tanks are cleaned and shipped ready for installation, supporting a replacement workflow.

Skip it if you need an in-bed auxiliary transfer tank; the RDS MFG INC 71083 is a 45-gallon rectangular auxiliary/transfer model.

This Dorman is for Chevrolet or GMC owners replacing an original tank on a specified application, not for adding an in-bed reserve. Its direct-replacement purpose makes confirming the vehicle-specific application important.

Listed on Amazon as: Dorman 576-343 Fuel Tank