Best Rat Rod Gas Tank: Compare 10 Spun Aluminum Options

#1 · Best Overall

1. Custom Fuel Tanks 5-Gallon Tank

• Capacity: 5 gallons
• Material: Aluminum
• Compatible with Vehicle Type: Car

Best for: Multiple-outlet custom setups.

Why it ranks #1: Explicitly listed as a rat rod tank, it holds 5 gallons and includes a billet cap and straps, with two top outlets and a bottom outlet.

Two 3/8-inch NPT female outlets on top and a 3/4-inch NPT female outlet on the bottom give this 8-by-20-inch, 5-gallon tank several specified connection points. The spun-aluminum construction and included black billet cap and two straps make it a defined option for a car or custom fuel-system layout.

The trio of threaded outlets—two 3/8-inch ports above and one 3/4-inch port below—offers connection choices for a setup that uses more than one tank opening. Its 8-by-20-inch dimensions and 5-gallon capacity provide the package's stated size and fuel volume, while two included black straps support mounting. The non-vented billet cap is also specified, an important detail when planning the fill and vent arrangement. The manufacturer lists additional customization options, including vents and fuel-sending-unit flanges.

Skip it if you want a vented cap included; Custom Fuel Tanks 10 X 33 includes a vented cap and sight gauge.

This is a fit for a car builder who can use its multiple outlet sizes and plans the vent arrangement around the non-vented billet cap. Its 8-by-20-inch footprint and 5-gallon capacity should suit the intended installation.

Listed on Amazon as: Rat Rod Gas Tank – 5 Gallons Spun Aluminum – 8 X 20 Inch – Billet Cap – USA Made

#2 · Best Included Hardware

2. JSD 7-Gallon End-Fill Tank

• Capacity: 7 gallons
• Material: Aluminum
• Compatible with Vehicle Type: Off-Road Vehicle

Best for: Seven-gallon off-road builds.

Why it ranks #2: Its title names rat rod use, while the 7-gallon aluminum tank includes mounting brackets and a vented cap for a ready-to-mount setup.

A 7-gallon capacity in a 10-by-22-inch end-fill aluminum tank gives this JSD model a defined middle-size option for hot-rod and off-road layouts. The listed accessories include two powder-coated steel brackets, a turn-vented cap, and three outlet-size options, offering mounting and fuel-delivery choices alongside the tank.

The 7-gallon capacity and 10-by-22-inch dimensions help distinguish this tank from smaller compact options and longer models. Its end-fill arrangement determines where the filler sits, while the turn-vented cap supports filling and venting. The feature list also specifies three outlet-size options, offering choices for fuel delivery, and two powder-coated black steel brackets for mounting. The manufacturer identifies off-road vehicles as compatible; verify the selected outlet option suits the planned connection.

Skip it if you need each outlet size stated before selecting; Custom Fuel Tanks 8 X 20 lists its outlet thread sizes explicitly.

This suits an off-road or hot-rod builder seeking 7 gallons, end fill, and listed mounting hardware. The three outlet options add flexibility, but their sizes are not specified here, so that detail matters for connection planning.

Listed on Amazon as: JSD 7 Gallons 10" x 22" Aluminum Spun Round Gas Tank Fuel Tank End Fill 1/4" NPT Outlet for Hotrod Ratrod

#3 · Best Sight Gauge

3. Custom Fuel Tanks 10.75-Gallon Tank

• Capacity: 10.75 gallons
• Material: Aluminum
• Compatible with Vehicle Type: Car, Dune Buggy, Hot Rod, Rat Rod, Trike

Best for: Sight-gauge dune buggy tanks.

Why it ranks #3: Explicitly suited to rat rods, this 10.75-gallon tank includes a fuel sight gauge, vented cap, two straps, and a bottom drain.

A fuel sight gauge lets you check the remaining fuel level directly on this 10-by-33-inch spun-aluminum tank, which holds 10.75 gallons. Its vented cap, 1/4-inch NPT bottom drain, and two black straps give dune buggy, sandrail, hot-rod, and rat-rod builders concrete details for planning filling, draining, and mounting.

The sight gauge provides a visible way to check fuel remaining, while the 10.75-gallon capacity offers more volume than the compact tanks in this selection. At 10 by 33 inches, the elongated shape requires space for a long tank rather than a short round footprint. A vented cap handles the specified fill arrangement, and the 1/4-inch NPT bottom drain supports draining. Two included black straps provide the listed mounting hardware.

Skip it if you have less than 33 inches available; Custom Fuel Tanks 8 X 12 is a shorter 12-inch tank.

Choose this for a dune buggy, sandrail, hot rod, or rat rod where a sight gauge and 10.75-gallon capacity matter. Its 33-inch length is the key fit boundary, so measure the intended installation area first.

Listed on Amazon as: 10 Inches X 33 Spun Aluminum Gas Tank 11 Gallons With Sight Gauge For Dune Buggy, Sandrail, Hot Rod, Rat Rod, Trike

#4

4. JSD 3.9-Gallon Center-Fill Tank

• Capacity: 3.9 gallons
• Material: Aluminum
• Compatible with Vehicle Type: Off Road Vehicle

Best for: Shorter off-road installations.

Why it ranks #4: Its title specifies rat rod use and a compact 8-by-18-inch size; the 3.9-gallon aluminum tank includes a vented cap and two brackets.

At 8 by 18 inches, this center-fill tank offers a shorter listed footprint than the 10-inch-wide, 33-inch-long tanks, while holding 3.9 gallons. Its aluminum construction, 1/4-inch NPT outlet, vented cap, and two black mounting brackets specify the core connections and mounting hardware for an off-road vehicle.

The 3.9-gallon capacity makes this a smaller-volume choice, and its 8-by-18-inch dimensions define a relatively short installation envelope. Center filling puts the fill point in the middle of the tank; the included vented cap accompanies that arrangement. A 1/4-inch NPT outlet specifies the listed connection size, while two powder-coated black steel brackets provide mounting hardware. The manufacturer identifies off-road vehicles as compatible, making this a focused option for that vehicle category.

Skip it if you need more than 3.9 gallons; JSD 10 x 18 offers 6.25 gallons in a similar listed length.

This suits an off-road build needing a compact center-fill tank with a vented cap and brackets included. Its 3.9-gallon capacity is the main boundary, so choose it when that volume matches the vehicle's requirements.

Listed on Amazon as: JSD 3.9 Gallons 8" x 18'' Spun Aluminum Round Fuel Tank Gas Tank Center Fill 1/4" NPT Outlet for Rat Rod, Offroad

#5 · Most Compact

5. Custom Fuel Tanks 2.5-Gallon Tank

• Capacity: 2.5 gallons
• Material: Aluminum
• Compatible with Vehicle Type: Street Rod

Best for: Small street-rod tanks.

Why it ranks #5: The 8-by-12-inch dimensions and 2.5-gallon capacity suit space-constrained rat rod builds; it has a center fill, vented cap, and bottom drain.

The 8-by-12-inch dimensions and 2.5-gallon capacity make this spun-aluminum tank a compact choice for a street rod with limited tank space. Its center-fill configuration is paired with a vented cap and 1/4-inch NPT bottom drain, giving the installation a stated fill arrangement and drain connection without adding listed mounting hardware.

This tank's 2.5-gallon capacity prioritizes a small fuel volume, while its 8-by-12-inch dimensions provide a compact footprint for a street-rod installation. The center-fill layout identifies where filling occurs, and the included vented cap supports that arrangement. A 1/4-inch NPT bottom drain provides a specified drain connection for service. The supplied details do not list straps or brackets, so mounting hardware should be considered separately when planning the installation.

Skip it if you need included mounting hardware; JSD 8 x 18 lists two brackets with its tank.

This fits a street-rod builder seeking a small center-fill tank with a vented cap and bottom drain. Its 2.5-gallon capacity and lack of listed straps or brackets make fuel volume and mounting hardware important considerations.

Listed on Amazon as: 8 Inches X 12 – Spun Aluminum Fuel Tank Center Fill 2.5 Gallons Small Round Aluminum Rat Rod Tank

#6 · Highest Gauge Capacity

6. Custom Fuel Tanks 12-Gallon Tank

• Capacity: 12 gallons
• Material: Aluminum
• Compatible with Vehicle Type: Car, Dune Buggy, Hot Rod, Rat Rod, Trike

Best for: Twelve-gallon sight-gauge tanks.

Why it ranks #6: This rat rod-compatible 12-gallon tank provides a sight gauge, vented cap, two straps, and bottom drain for builds needing greater capacity.

A fuel sight gauge gives a direct way to check remaining fuel in this 12-gallon, 10-by-36-inch spun-aluminum tank. Its TIG-welded construction is paired with a vented cap, 1/4-inch NPT bottom drain, and two black straps, supplying useful details for fuel checks, draining, and mounting on a hot rod or dune buggy.

The 12-gallon capacity supports builds needing more volume than the smaller tanks, and the 10-by-36-inch dimensions require a long installation area. A sight gauge offers a visible fuel-level check without relying only on an assumed amount remaining. The vented cap and 1/4-inch NPT bottom drain specify fill and drain features, while two included black straps provide the listed mounting method. The manufacturer names hot rods, dune buggies, sandrails, and trikes among compatible uses.

Skip it if you have less than 36 inches available; Custom Fuel Tanks 10 X 33 is three inches shorter.

This fits a hot-rod, dune-buggy, sandrail, or trike builder who wants 12 gallons and a sight gauge. Its 36-inch length is the critical fit boundary, alongside the need to plan around its bottom drain.

Listed on Amazon as: 10 Inches X 36 Spun Aluminum Gas Tank 12 Gallons With Sight Gauge For Dune Buggy, Sandrail, Hot Rod, Rat Rod, Trike

#7

7. Custom Fuel Tanks 13.5-Gallon Tank

• Capacity: 13.5 gallons
• Material: Aluminum
• Compatible with Vehicle Type: Car, Go Kart, UTV

Best for: Maximum-capacity sight-gauge builds.

Why it ranks #7: It offers the largest listed capacity at 13.5 gallons and includes a sight gauge, vented cap, and two straps, though its fit needs checking.

At 13.5 gallons, this 10-by-40-inch spun-aluminum tank offers the largest stated capacity in this roundup, with a sight gauge for checking fuel level. Its TIG-welded construction, vented cap, 1/4-inch NPT bottom drain, and two black straps provide specified details for fuel monitoring, filling, draining, and mounting.

The 13.5-gallon capacity makes this the highest-volume option listed, while its 10-by-40-inch dimensions call for a particularly long installation space. The sight gauge helps make the remaining fuel visible, and the vented cap specifies the fill arrangement. A 1/4-inch NPT bottom drain supplies a defined drain connection, while two included black straps provide mounting hardware. Listed compatible vehicle types include car, go-kart, and UTV, with additional described uses including hot rods and dune buggies.

Skip it if you cannot accommodate a 40-inch tank; Custom Fuel Tanks 10 X 33 is seven inches shorter and includes a sight gauge.

This suits a builder needing maximum listed capacity and a visible fuel-level check for a car, go-kart, UTV, or described hot-rod use. Its 40-inch length is a major fit constraint, so measure the mounting area carefully.

Listed on Amazon as: 10 Inches X 40 Spun Aluminum Gas Tank 13.5 Gallons With Sight Gauge For Dune Buggy, Sandrail, Hot Rod, Rat Rod, Trike

#8

8. JSD 5-Gallon Center-Fill Tank

• Capacity: 5 gallons
• Material: Alloy Steel
• Compatible with Vehicle Type: Powersports Vehicle

Best for: Compact center-fill rat rods.

Why it ranks #8: This 5-gallon tank is explicitly listed for rat rod use and includes two mounting brackets and a cap; its listed material is alloy steel.

A 10-by-16-inch, 5-gallon tank pairs a center-fill layout with a 3/8-inch NPT outlet, giving a compact rat-rod installation a defined fuel connection. Two powder-coated steel brackets, a cap, and a housing are listed as included components, so the package addresses mounting and basic tank hardware together.

The 5-gallon capacity and 10-by-16-inch dimensions make this a smaller-format choice than the longer tanks in the lineup, while the center-fill arrangement places filling at the middle of the tank. Its 3/8-inch NPT outlet gives the fuel connection a specified thread size. Two powder-coated black steel brackets are supplied for mounting, and the included cap and housing add hardware to the package. The listing identifies powersports vehicles as compatible.

Skip it if you need more than five gallons; Custom Fuel Tanks 8 X 20 offers the same listed five-gallon capacity, so choose a larger-capacity model instead.

This suits a rat-rod or off-road builder seeking a compact center-fill tank with mounting brackets and a specified 3/8-inch outlet. Check that its 10-by-16-inch dimensions and 5-gallon capacity suit the available space and intended use.

Listed on Amazon as: JSD 5 Gallons 10"x16" Aluminum Spun Round Universal Gas Tank Fuel Tank Center Fill 3/8" NPT Outlet Rat Rod,Off-Road

#9

9. JSD 6.25-Gallon End-Fill Tank

• Capacity: 6.25 gallons
• Material: Aluminum
• Compatible with Vehicle Type: Truck/hot

Best for: Mid-capacity end-fill trucks.

Why it ranks #9: Its aluminum construction and 6.25-gallon capacity may suit hot rod builds, but the listing does not specifically identify rat rod compatibility.

This 10-by-18-inch end-fill aluminum tank holds 6.25 gallons, offering a middle ground between compact tanks and elongated high-capacity models. Its 1/4-inch NPT outlet specifies the fuel connection, and two powder-coated black steel brackets are listed for mounting. The manufacturer identifies truck and hot-rod use, aligning its size with those applications.

The 6.25-gallon capacity provides more volume than the smallest tanks while keeping the listed length to 18 inches. End fill establishes the filler position, which matters when laying out the tank in a truck or hot rod. A 1/4-inch NPT outlet gives the fuel connection a defined thread size. Two powder-coated black steel brackets are identified as mounting hardware in the features, although the specifications list no included components, so check the supplied package details before planning around accessories.

Skip it if you need a listed bracket package without conflicting component details; JSD 8 x 22 explicitly lists brackets and a vented cap.

This is suited to truck and hot-rod builders seeking 6.25 gallons in an 18-inch-long end-fill tank. Its listed outlet and dimensions support planning, but the conflicting bracket information warrants checking package contents before installation.

Listed on Amazon as: JSD 6.25 Gallons 10"x18" Aluminum Spun Round Gas Tank Fuel Cell Tank End Fill 1/4"NPT For Truck/Hot Rod

#10

10. JSD 11-Gallon End-Fill Tank

• Capacity: 11 gallons
• Material: Aluminum
• Compatible with Vehicle Type: Truck, SUV

Best for: Long-range hot-rod builds.

Why it ranks #10: The 11-gallon aluminum tank is described for hot rods and street rods, but its listed vehicle compatibility is truck and SUV rather than rat rod.

An 11-gallon capacity in a 10-by-33-inch aluminum tank gives this end-fill model the largest stated volume among the JSD options here. Its 1/4-inch NPT outlet specifies the fuel connection, while two powder-coated black steel brackets are listed for mounting, making the elongated tank a substantial option for hot-rod or street-rod builds.

The 11-gallon capacity is useful when a build calls for more fuel volume than the smaller JSD tanks provide, but the 10-by-33-inch dimensions require room for a long installation. End fill distinguishes its layout from center-fill options and affects where the filler must sit in the vehicle. A 1/4-inch NPT outlet defines the specified connection. Two powder-coated steel brackets are listed for mounting, giving builders hardware for securing the tank.

Skip it if you have less than 33 inches of space; JSD 10 x 18 is a shorter listed tank.

This suits a hot-rod or street-rod builder prioritizing an 11-gallon tank and an end-fill layout. The 10-by-33-inch form is the main fit constraint, so confirm that the installation area accommodates its length.

Listed on Amazon as: JSD 11 Gallons 10"x33" Aluminum Round Spun Gas Tank Fuel Cell Tank End Fill 1/4" NPT Outlet for Hotrod Streetrod