Best Auxiliary Fuel Tank For Gasoline: Compare 10 Options

#1 · Best Overall

1. RDS MFG INC 71083

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

Best for: Pump-fed gasoline auxiliary use.

Why it ranks #1: Its 45-gallon aluminum tank explicitly permits gasoline auxiliary fueling when siphoned from the top with an electric fuel pump.

Gasoline auxiliary fueling is permitted when fuel is siphoned from the tank’s top with an electric fuel pump, making this 45-gallon RDS tank a clearly specified option for that setup. Its aluminum construction and fully welded seams suit buyers seeking a substantial truck fuel reserve, while the rectangular form gives the tank a defined footprint to plan around.

The 45-gallon capacity offers a sizeable reserve, and the aluminum body avoids rusting, a useful material property for a tank kept in service over time. Fully welded seams add a durability-focused construction detail. For gasoline auxiliary fueling, the supplied guidance specifies top siphoning with an electric fuel pump; it does not describe gravity-feed gasoline use. At 42 pounds, the tank’s stated weight is another practical factor when planning handling and installation. Check the 57? No dimensions are supplied, so assess available space before purchase.

Skip it if you need a stated tank footprint; this listing gives capacity and weight but no dimensions to plan a truck-bed installation.

Choose this RDS for a 45-gallon aluminum reserve when your gasoline setup can siphon from the tank’s top with an electric pump. Its dimensions are not listed here, so plan the available installation space separately.

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

#2 · Shallow Profile

2. RDS MFG INC 71804

• Capacity: 37 gallons
• Material: Aluminum
• Weight: 77 lb

Best for: Low-profile aluminum reserve.

Why it ranks #2: The 37-gallon aluminum tank explicitly allows gasoline auxiliary fueling by top siphoning with an electric fuel pump; listed dimensions are 50 by 20 by 9 inches.

A 9-inch listed height gives this 37-gallon RDS aluminum tank a notably low stated profile, useful when truck-bed space makes vertical clearance a planning concern. The 50-by-20-inch footprint and 77-pound listed weight are concrete installation considerations. For gasoline auxiliary fueling, RDS specifies siphoning from the tank’s top with an electric fuel pump.

The 37-gallon capacity offers a substantial reserve, while the 50-by-20-by-9-inch dimensions help assess how it fits a vehicle’s available space. Aluminum avoids rusting, a practical material benefit for a tank kept in service. RDS’s gasoline guidance specifies top siphoning with an electric fuel pump, so the operating setup needs to account for that equipment. At 77 pounds, its stated weight also matters when planning handling and installation in a vehicle.

Skip it if you need a lighter tank to handle; this RDS model is listed at 77 pounds before installation.

Choose this RDS for a low-profile 37-gallon aluminum reserve when its 50-by-20-inch footprint suits the vehicle. Gasoline auxiliary use requires top siphoning with an electric pump, and its 77-pound weight merits handling plans.

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

#3 · Highest Capacity

3. RDS MFG INC 70326

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

Best for: High-capacity truck-bed reserve.

Why it ranks #3: Its 69-gallon aluminum tank is the largest listed option with explicit gasoline auxiliary fueling guidance, requiring top siphoning with an electric fuel pump.

The 69-gallon capacity is the defining feature of this RDS rectangular aluminum tank, giving truck owners a large auxiliary reserve in a 57-by-18-by-16-inch footprint. Gasoline auxiliary fueling is allowed when siphoned from the tank’s top using an electric fuel pump, so the listed use has a specific operating requirement rather than an unspecified transfer method.

At 69 gallons, this tank prioritizes reserve volume, while its listed dimensions let buyers check the truck-bed space needed before planning installation. The aluminum construction provides a non-rusting tank material. For gasoline auxiliary fueling, RDS specifies top siphoning with an electric pump; that detail matters when choosing the supporting equipment and workflow. The listing identifies compatibility with multiple vehicle types, but the 57-inch length and 18-by-16-inch profile remain important practical fit considerations for a particular vehicle.

Skip it if you need a smaller reserve; the 69-gallon capacity and 57-inch length may exceed your truck-bed space.

This RDS suits buyers prioritizing a large 69-gallon auxiliary reserve and able to accommodate its listed dimensions. For gasoline use, plan on top siphoning with an electric fuel pump; confirm the truck-bed space against the tank’s footprint.

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

#4 · Short-Bed Fit

4. RDS MFG INC 71212

• Capacity: 60 gallons
• Material: Aluminum
• Weight: 61 lb

Best for: Short-bed 60-gallon reserve.

Why it ranks #4: The 60-gallon aluminum tank explicitly allows gasoline auxiliary fueling using top siphoning and an electric fuel pump; the listing says it fits some short beds.

This 60-gallon RDS aluminum tank is listed to fit some short beds, giving truck owners a high-capacity option where bed length is constrained. Its 56-by-13-by-19.25-inch dimensions support space planning, but RDS advises measuring before ordering. Gasoline auxiliary fueling is allowed with top siphoning by an electric fuel pump; transferring gasoline to another vehicle is not allowed.

The 60-gallon capacity offers a substantial reserve, and the aluminum body avoids rusting. Its 56-inch length and 13-inch width help buyers assess fit, while the stated short-bed compatibility is limited to some trucks; measuring is specifically advised. For gasoline auxiliary fueling, the supplied instructions require top siphoning with an electric pump. This model cannot be used to transfer gasoline to another vehicle, an important operating limit if the intended task is refueling another vehicle.

Skip it if you need to refuel another vehicle; this tank’s listing explicitly prohibits transferring gasoline to another vehicle.

This RDS suits truck owners seeking a 60-gallon auxiliary reserve and whose short bed accommodates its dimensions. Measure before ordering, and note that gasoline use requires top siphoning with an electric pump, not transfer to another vehicle.

Listed on Amazon as: RDS MFG INC Fuel Tank – 60-Gallon

#5

5. RDS MFG INC 72548

• Capacity: 60 gallons
• Material: Alloy Steel, Aluminum, Stainless Steel
• Weight: 16 oz

Best for: Truck toolbox and fuel combo.

Why it ranks #5: This 60-gallon truck toolbox and auxiliary-tank combination offers substantial capacity, but the supplied listing does not specifically state its gasoline fueling method.

A toolbox-and-fuel-tank combination gives this 60-gallon RDS unit a dual-purpose truck-bed role, pairing storage space with a substantial fuel capacity. Its listed dimensions are 55 by 20 by 19.5 inches, making the footprint an essential part of installation planning. The listing identifies truck compatibility, but does not specify gasoline auxiliary fueling conditions for this model.

The combined toolbox and tank format can consolidate two truck-bed functions in one unit, while the 60-gallon capacity provides considerable fuel storage. Its 55-by-20-by-19.5-inch dimensions help buyers assess the space it occupies before arranging other bed equipment. The listed materials include alloy steel, aluminum, and stainless steel. Unlike RDS listings that specify top siphoning with an electric pump for gasoline, this product’s supplied facts do not state gasoline-use conditions, so buyers should not infer a transfer method.

Skip it if you require explicit gasoline-use instructions; the RDS MFG INC 70326 specifies top-siphoned gasoline auxiliary fueling with an electric pump.

This RDS combination suits truck owners wanting toolbox storage alongside a 60-gallon tank and able to fit its stated footprint. The supplied facts do not establish gasoline auxiliary-use conditions, a key boundary for gasoline buyers.

Listed on Amazon as: RDS MFG INC – 72548 Fuel Transfer Tank/Auxiliary Fuel Tank/Toolbox Combo – 60 Gallon

#6 · Workshop Motorcycle Tank

6. MOTO4U Auxiliary Tank

• Capacity: 1 liters
• Material: Plastic
• Weight: 0.26 kg

Best for: Versatile motorcycle service tank.

Why it ranks #6: Its one-liter plastic tank is intended for motorcycles and also lists use on mowers, bikes, and cars, but it is far smaller than truck auxiliary tanks.

A 1-liter tank with a hose sized for a 1/4-inch interface gives this MOTO4U kit a specific connection point for motorcycle service work. The listing covers fuel-injected models with external fuel pumps as well as carbureted motorcycles, and also mentions mowers, bikes, and cars. Its compact capacity makes it a service tool rather than a large gasoline reserve.

The stated 1/4-inch hose interface supports a defined connection workflow, while the listing says the tank can serve fuel-injected motorcycles with external pumps and standard carbureted models. That breadth can help a mechanic use one small tank across different engine setups. The 1-liter capacity, however, limits its role as a reserve for travel. The product is also listed for refilling transmission oil on some late-model motocross bikes, so its stated uses extend beyond fuel-system service.

Skip it if you need a high-capacity travel reserve; this service tank holds 1 liter, while the RDS MFG INC 71804 holds 37 gallons.

This MOTO4U suits mechanics needing a small service tank across the motorcycle setups listed, including external-pump and carbureted models. Its 1-liter capacity and 1/4-inch interface make it a poor substitute for a large vehicle reserve.

Listed on Amazon as: MOTO4U Auxiliary Gas Fuel Tank Universal Motorcycle Gas Tank Repair Tool Kit Auxiliary Fuel Tank 1L with Fuel Hose,Cut Off Valve and Lid with Air Outlet

#7

7. WINTOWIN Auxiliary Tank

• Capacity: 1 liters
• Material: Plastic
• Weight: 0.44 kg

Best for: Portable motorcycle carburetor work.

Why it ranks #7: The one-liter plastic motorcycle tank includes a brass petcock and 108-centimeter hose, making it a compact option rather than a truck-range extender.

A clear capacity scale on its 1-liter ABS tank makes fuel level visible during motorcycle work, while the included 108-centimeter hose and brass petcock support controlled delivery. WINTOWIN presents this lightweight auxiliary tank for riders and carburetor synchronization, not as a large vehicle-mounted reserve; its compact capacity favors maintenance tasks and modest supplementary fuel needs.

The 1-liter capacity and clear scale let users monitor the amount of fuel in the tank during a task. Its 108-centimeter hose provides reach between the tank and work area, while the solid brass petcock gives a control point for fuel flow. The listing describes the product as suitable for long-distance motorcyclists and commuters, but the small capacity sets a firm limit on how much reserve it can add. Its 266-gram stated weight supports portable handling.

Skip it if you need a substantial motorcycle range extension; this tank holds 1 liter, not the capacity of a vehicle-mounted auxiliary tank.

Choose this WINTOWIN for portable motorcycle fuel handling or carburetor synchronization where a visible 1-liter supply and hose are useful. It is not a fit for buyers who need a large, installed auxiliary reserve.

Listed on Amazon as: Auxiliary Gas Fuel Tank Universal Motorcycle Gas Tank Repair Tool Kit Auxiliary Fuel Tank 1L with Fuel Hose,Cut Off Valve and Lid with Air Outlet

#8

8. porotmotor 500ml Tank

• Capacity: 500 ml
• Material: Metal
• Weight: 0.21 kg

Best for: Small-engine tuning and testing.

Why it ranks #8: Its 500-milliliter metal tank is specifically described for small-engine work and carburetor tuning, not long-distance vehicle auxiliary fueling.

A vented 500-milliliter metal tank lets this porotmotor auxiliary supply fuel directly to a carburetor while bypassing the main tank. The listing focuses on small-engine work, carburetor adjustments, and testing engines before final assembly, making it a compact maintenance tool rather than a road-trip fuel reserve.

Bypassing the main tank and delivering fuel directly to the carburetor supports troubleshooting and precise adjustment without relying on the machine’s installed tank. The stated vented design and 500-milliliter capacity fit short maintenance tasks, while the metal material distinguishes its construction. Its small volume limits usefulness for extended running or travel-range extension. The supplied safety notice also warns against refueling hot or burning devices, an important operating boundary during engine work.

Skip it if you need more than a small engine-work supply; the tank holds just 500 milliliters and is aimed at tuning tasks.

Choose this porotmotor for carburetor tuning, direct-to-carburetor testing, and small-engine work where a vented 500-milliliter supply fits. It is not suited to buyers seeking meaningful extra driving range or a large gasoline reserve.

Listed on Amazon as: Motorcycle Auxiliary Fuel Tank (500ml with Vent) Gas Tank for Small Engine Work and Carburetor Tuning

#9

9. Better Built 36-Gallon Tank

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

Best for: Spill-conscious 36-gallon setup.

Why it ranks #9: The 36-gallon steel tank has baffles and a lockable cap, but its listing does not establish gasoline compatibility and describes transfer use.

An overfill restriction that automatically shuts off at the pump is the key feature of this 36-gallon Better Built tank, helping prevent spills during filling. Built-in baffles add strength and limit contents shifting in transit, while a lockable cap adds security. Its listed features make filling control and transport stability central considerations for truck owners choosing this rectangular steel tank.

The automatic pump shutoff addresses overfilling during fueling, while the two-inch flush-mounted inlet and outlet bungs are specified for fast flow. Baffles both add strength and limit movement of contents during transport, a useful pairing for a working truck setup. A lockable cap adds a security measure, and the included mounting kit with rubber bushings supports installation. At 36 gallons, its reserve is smaller than the largest tanks in this roundup, so capacity needs should guide the choice.

Skip it if you need more than 36 gallons of reserve; the RDS MFG INC 70326 holds 69 gallons.

This Better Built suits truck owners who value pump shutoff, baffles, and a lockable cap in a 36-gallon steel tank. Choose it when that capacity is enough and its rectangular dimensions work for your installation.

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

#10

10. Dee Zee DZ92556NSB

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

Best for: Baffled steel transport tank.

Why it ranks #10: This 42-gallon steel transfer tank is described for non-flammable liquids, so the supplied information does not support using it for gasoline.

Five stability baffles distinguish this 42-gallon Dee Zee tank, helping stabilize contents during transport in a heavy-duty 14-gauge steel body. Its radius-curve design eliminates weld pressure points, while mounting tabs are provided to secure the tank to a truck bed. One important boundary for gasoline buyers: the supplied description identifies it for transporting non-flammable liquids.

The baffles address movement of the tank’s contents in transit, and the mounting tabs provide attachment points for securing it in the truck bed. Dee Zee pairs those details with 14-gauge steel and a radius-curve design that eliminates weld pressure points. A drain plug supports draining, and the black NRT powder-coat finish is described as a rust inhibitor. However, the supplied description calls this a means for transporting non-flammable liquids, so it is not a straightforward match for gasoline use.

Skip it if you need a tank explicitly specified for gasoline; the description limits this Dee Zee to non-flammable liquids.

Choose this Dee Zee for transporting non-flammable liquids when steel construction, baffles, and truck-bed mounting tabs fit your workflow. For a gasoline auxiliary tank, its stated non-flammable-liquid use is a boundary to take seriously.

Listed on Amazon as: Dee Zee DZ92556NSB Transfer Tank