Best External Fuel Tanks For Pickup Trucks: Compare 10 Options

#1 · Best Overall

1. AM-TANK 58 Diesel Pick-Up

• Capacity: 58 gallons
• Material: Rotomoulded Antistatic Polyethylene

Best for: Tonneau-cover diesel haulers.

Why it ranks #1: Its 58-gallon low-profile design is made to fit under a tonneau cover and includes a 10.5 GPM 12V pump, 13-foot hose and automatic shut-off nozzle.

A low-profile 58-gallon tank sits beneath a tonneau cover, letting pickup owners carry a substantial diesel supply while keeping the bed covered. Its included 12V transfer unit, 10.5 GPM pump, 13-foot hose and automatic shut-off nozzle make on-site refueling practical for trucks, tractors, excavators and generators.

The rotomoulded antistatic polyethylene tank pairs a 58-gallon capacity with a low profile, so it can remain under a closed bed cover instead of occupying an exposed, uncovered load area. For dispensing, the 12V DC pump delivers 10.5 GPM through a 13-foot hose, while the automatic shut-off nozzle helps stop flow at the receiving tank. The pump is rated IP55 and has a 30-minute duty cycle, a limit to account for during extended refueling.

Skip it if you need a steel transfer tank with built-in baffles; the Better Built Model 29211584 lists both features.

Choose it if you need a covered, on-truck diesel supply for equipment or vehicles at remote work sites. Its low profile suits tonneau-cover use, but the pump’s 30-minute duty cycle matters during prolonged dispensing.

Listed on Amazon as: AM-TANK 58 Gallon Diesel Transfer Tank – Low Profile, Fits Under Tonneau Cover – 12V Pump 10.5 GPM, 13 ft Hose, Auto Shut-Off Nozzle, Filter Included – Made in Italy

#2 · Portable Polyethylene

2. CAMMOO 58-Gallon Transfer Tank

• Capacity: 58 gallons
• Material: Aluminum, High Density Polyethylene (HDPE)…
• Weight: 68.8 lb

Best for: Portable powered diesel refueling.

Why it ranks #2: This 58-gallon portable diesel tank includes a 12V DC pump rated at 13.2 GPM and uses flame-retardant LLDPE and HDPE construction.

A 12V DC pump rated at 13.2 GPM pairs with a 58-gallon capacity, giving the CAMMOO portable tank a powered option for moving diesel to equipment. Its tank uses flame-retardant LLDPE and HDPE, and the product listing says it meets DOT requirements for portable fuel transport.

The 58-gallon capacity provides a substantial diesel reserve, while the 13.2 GPM pump specification indicates a powered dispensing workflow rather than relying only on gravity feed. CAMMOO lists flame-retardant LLDPE and HDPE construction with resistance to UV, rain, snow, wear and corrosion, supporting outdoor use. A combo lock is listed for securing access. The stated operating range with fuel inside is 14°F to 104°F, so conditions outside that range are a clear operating boundary.

Skip it if you need a tank specified for operation below 14°F; the AM-TANK 58 DIESEL PICK-UP listing gives a 30-minute pump duty cycle instead.

This suits buyers needing a portable, powered diesel supply for outdoor equipment and who can operate within the stated 14°F–104°F range. Review that temperature limit alongside the 58-gallon capacity before choosing.

Listed on Amazon as: CAMMOO Real 58 Gallon Portable Diesel Fuel Transfer Tank, 13.2 GPM, 12V DC

#3 · Built-In Toolbox

3. Vigorighter 51-Gallon Toolbox Combo

• Capacity: 51 gallons
• Material: Aluminum

Best for: Fuel-and-toolbox bed combo.

Why it ranks #3: The 51-gallon aluminum tank combines fuel storage and a 31-by-19-by-8.8-inch toolbox, plus a 12 GPM pump and 13-foot hose.

An integrated 31-by-19-by-8.8-inch toolbox shares the unit with a 51-gallon aluminum fuel tank, combining fuel and tool storage in one truck-bed footprint. The listed 12V pump delivers 12 GPM through a 13-foot hose, and an auto nozzle supports a ready-to-dispense setup.

The aluminum combo measures 50 by 19 by 21 inches overall according to the verified dimensions, with the toolbox occupying 31 by 19 by 8.8 inches. That arrangement gives tools a dedicated compartment while retaining 51 gallons of fuel capacity. A 12V DC pump rated at 12 GPM, 13-foot hose and automatic nozzle support dispensing at the work site. The supplied note says to open the pressure-relief valve when pumping and periodically during long-term storage to prevent vacuum collapse or deformation.

Skip it if you need a 58-gallon tank with a stated low profile under a tonneau; the AM-TANK 58 DIESEL PICK-UP lists that fit.

This combo fits truck owners who want fuel, tools and cargo handled in one bed unit, with powered dispensing at the site. Account for its 21-inch overall height and follow the pressure-relief instructions.

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

#4 · Steel Tank

4. Better Built 36-Gallon Steel Tank

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

Best for: Baffled steel work-truck tank.

Why it ranks #4: Its 36-gallon alloy-steel tank includes a lockable vented cap and mounting kit, with baffles and an overfill restriction for pickup-bed transfer use.

Built-in baffles help keep fuel from shifting during transport, making the Better Built 36-gallon steel tank a practical option for work trucks carrying fuel to a job site. Its overfill restriction also shuts off automatically at the pump, while a lockable cap adds a measure of access security.

The alloy-steel tank holds 36 gallons, and its baffles are intended to reduce movement of the contents while the truck is underway. At the pump, the overfill restriction provides automatic shutoff to help prevent spills. Flush-mounted two-inch inlet and outlet bungs support fast flow, and the included vented lockable cap and mounting kit with rubber bushings address access and mounting needs. Its listed dimensions are 11 inches wide by 17 inches high, useful when assessing bed-space constraints.

Skip it if you need a tank that fits beneath a tonneau cover; the AM-TANK 58 DIESEL PICK-UP is listed as low profile for that use.

This suits work-truck owners who value baffles, pump-side overfill shutoff and a lockable cap in a steel tank. Its 36-gallon capacity is a boundary for buyers planning longer runs between refills.

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

#5

5. Dee Zee 40-Gallon Aluminum Tank

• Capacity: 40 gallons
• Material: Aluminum
• Weight: 60 lb

Best for: Aluminum tank for truck beds.

Why it ranks #5: This 40-gallon aluminum tank has three stability baffles, mounting tabs and a lockable cap, offering a non-rusting tank-only option for a truck bed.

Brite-Tread aluminum gives the 40-gallon Dee Zee DZ92556NB a non-rusting tank body, making it a considered choice for truck owners who want aluminum fuel storage. Three stability baffles help manage movement in transit, and the radius-curve design eliminates key weld pressure points.

At 59 by 22 by 10 inches, this 40-gallon tank has a relatively low listed height that buyers can compare with their available bed area. The aluminum construction is described as non-rusting, while three stability baffles help limit fuel movement on the road. Mounting tabs secure it to the truck bed; a lockable cap, venting coupler and 3/8-inch drain plug support access and draining. The supplied assembly and installation hardware addresses the mounting workflow.

Skip it if you need more capacity and fully welded seams; the RDS MFG INC 71083 holds 45 gallons and lists welded seams.

Choose this Dee Zee when aluminum construction, bed mounting tabs and a 10-inch listed height suit your truck-bed plan. Its 40-gallon capacity is the key boundary for buyers needing a larger reserve.

Listed on Amazon as: DEE ZEE DZ92556NB Transfer Tank

#6

6. RDS 45-Gallon Auxiliary Tank

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

Best for: Welded-seam aluminum tank.

Why it ranks #6: The 45-gallon aluminum tank has fully welded seams and no-rust construction; RDS says some tanks support auxiliary fueling with an appropriate installation kit.

Fully welded seams and aluminum construction define the RDS 71083, a 45-gallon tank for truck owners seeking transfer or auxiliary fuel storage. RDS describes its aluminum tank as non-rusting, and its auxiliary-tank information explains diesel gravity feed from the tank’s bottom when connected to a vehicle fuel system.

The 45-gallon capacity offers a middle ground between smaller tanks and the largest options in this roundup. Aluminum construction is identified as non-rusting, while fully welded seams are specified for durability during transport. RDS says auxiliary tanks connect to the vehicle’s fuel tank and that diesel can gravity-feed from the bottom; its description references an optional diesel install kit. Gasoline use has a specific condition: siphon from the top using an electric fuel pump, rather than treating it as a gravity-feed application.

Skip it if you need a listed 12V powered pump and hose; the Vigorighter 51 Gallon combo specifies both.

Pick this RDS model if welded seams, aluminum construction and the described diesel auxiliary-feed setup match your truck plans. For gasoline, account for the specified top-siphon method and electric pump requirement.

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

#7

7. Dee Zee 42-Gallon Steel Tank

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

Best for: Baffled heavy-duty steel tank.

Why it ranks #7: Its 42-gallon alloy-steel tank includes five stability baffles, a drain plug and mounting tabs, but does not list a transfer pump.

Five stability baffles distinguish this 42-gallon Dee Zee steel transfer tank, helping steady its contents as the truck moves. The 14-gauge steel body has a radius-curve design that eliminates weld pressure points, while mounting tabs provide a way to secure the tank to the truck bed.

The 42-gallon capacity suits buyers who want a substantial supply without stepping up to the larger tanks in this group. Its five stability baffles address movement during transport, and the heavy-duty 14-gauge steel construction pairs with the radius curve to eliminate weld pressure points. Mounting tabs support bed securing, while the listed 59.5-inch width and 19-inch height are useful for checking available space. A drain plug is also listed for draining the tank.

Skip it if you prefer aluminum construction and a lower listed weight; the Dee Zee DZ92556NB is aluminum and weighs 60 pounds.

This is a fit for truck owners seeking a baffled steel tank with bed mounting tabs and a drain plug. Its 70-pound listed weight and 59.5-inch width are important handling and space considerations.

Listed on Amazon as: Dee Zee DZ92556NSB Transfer Tank

#8 · Largest RDS Capacity

8. RDS 69-Gallon Auxiliary Tank

• Capacity: 69 gallons
• Material: Aluminum
• Weight: 16 oz

Best for: High-capacity auxiliary fuel storage.

Why it ranks #8: The 69-gallon aluminum tank offers substantial capacity, but listed details do not include a pump; auxiliary use may require a separate installation kit.

A 69-gallon capacity makes this rectangular RDS aluminum tank the high-volume choice in this selection for truck owners seeking auxiliary fuel storage. RDS also describes auxiliary connections to a vehicle fuel tank, with diesel able to gravity-feed from the tank’s bottom when the installation supports that arrangement.

The 57-by-18-by-16-inch aluminum tank offers substantial reserve capacity, while its rectangular dimensions give buyers concrete measurements to consider against available bed space. RDS says its auxiliary tanks connect to the vehicle’s fuel tank and that diesel can gravity-feed from the bottom; an optional diesel install kit is referenced in the supplied description. Gasoline use is allowed only when siphoned from the top with an electric fuel pump, so fuel type and transfer method matter when planning the setup.

Skip it if you need a listed built-in powered dispensing setup; the CAMMOO Real 58 Gallon tank specifies a 12V DC pump.

Consider this RDS tank if reserve volume and an auxiliary connection for diesel are your priorities. Check the 57-inch length against bed space, and note that gasoline transfer requires the stated top-siphon method.

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

#9

9. ATI TTL95 Refueling Tank

• Capacity: 95 gallons
• Material: Aluminum
• Weight: 137 lb

Best for: Large-volume multi-fuel haulers.

Why it ranks #9: This 95-gallon aluminum tank is fully baffled and has a lockable vented cap, but its 52-by-48-by-33-inch dimensions require substantial bed space.

A 95-gallon capacity and DOT special permit make the ATI TTL95 a large-volume option for truck and SUV owners transporting listed fuels. Its .125-inch aluminum diamond plate body is fully baffled to reduce movement, while a commercial-grade lockable vent/prevent filler cap supports controlled access.

The 95-gallon capacity suits buyers prioritizing a large onboard supply, and the 52-by-48-by-33-inch dimensions call for careful bed-space planning. ATI lists use for gas, diesel, methanol, kerosene, aviation fuel and other liquids under a US Department of Transportation special permit. The .125-inch aluminum diamond plate construction and full baffling address durability and fuel movement in transit. At 137 pounds listed weight, handling and installation are significant practical considerations before loading fuel.

Skip it if you need a tank with a listed 12V pump and dispensing hose; the CAMMOO Real 58 Gallon specifies both.

Choose the TTL95 when high capacity and the listed permitted fuel range are central to a truck or SUV setup. Its 52-by-48-inch footprint, 33-inch height and 137-pound weight require substantial space and handling planning.

Listed on Amazon as: 95 Gallon Transfer Refueling Tank – Gas or Diesel Fuel – DOT Approved TTL95

#10

10. ATI AUX46R Auxiliary Gas Tank

• Capacity: 46 gallons
• Material: Aluminum

Best for: Auxiliary gas capacity seekers.

Why it ranks #10: Although its listed capacity is 46 gallons, the product data identifies motorcycle and powersports compatibility rather than pickup use, making it the weakest fit.

A 46-gallon capacity gives the Aluminum Tank Industries AUX46R substantial auxiliary fuel volume in a 62-by-20-by-14-inch listed package. It is identified as an aluminum auxiliary gas tank, but its vehicle compatibility listing names motorcycles and powersports vehicles rather than pickup trucks, a key distinction for this roundup.

The 46-gallon capacity and 62-inch length make dimensions and intended installation central to evaluating this tank. Its specifications identify aluminum construction and list motorcycle and powersports vehicles as compatible types; the supplied product description also calls it an auxiliary gas tank. Those facts do not establish pickup-truck compatibility, so truck owners should not assume it mounts or connects to a truck fuel system. Treat its listed application as the boundary when considering it for a pickup roundup.

Skip it if you need a tank explicitly listed for trucks; the ATI TTL95 specifies truck and SUV compatibility.

This is relevant only if its auxiliary-gas description and dimensions suit your intended installation. For pickup use, the listed motorcycle and powersports compatibility is a substantial fit boundary, not confirmation of truck application.

Listed on Amazon as: AUX46R Auxiliary Gas Tank – 46 Gallon Capacity