For truck owners who venture far from gas stations, a reserve fuel tank for the truck bed is a game-changer. Whether you’re towing a trailer, exploring remote trails, or working on a job site, having extra fuel on hand saves time and reduces anxiety. We researched the market, compared manufacturer specifications, evaluated safety certifications, and aggregated owner feedback to bring you this buying guide. Our goal is to help you find a tank that balances capacity, durability, ease of installation, and compliance with safety standards.
| Photo | Product | Score | Buy |
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RDS Manufacturing 30-Gallon Aluminum Fuel Tank Best Overall 30-gallon capacity, aluminum construction, 48" x 22" x 15" |
9.0 | 🛒 Check Price |
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Transfer Flow 34-Gallon In-Bed Fuel Tank Premium Pick 34-gallon capacity, steel construction, CARB/EPA compliant |
8.7 | 🛒 Check Price |
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Scepter 20-Gallon Military Fuel Can Best Portable 20-gallon capacity, HDPE plastic, 20" x 14" x 16" |
8.3 | 🛒 Check Price |
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Titan Fuel Tanks 30-Gallon Diesel Tank Best for Diesel 30-gallon capacity, steel, with fuel pickup tube |
8.1 | 🛒 Check Price |
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KEMIMOTO 18-Gallon Fuel Tank Budget Pick 18-gallon capacity, HDPE plastic, 28" x 14" x 12" |
7.8 | 🛒 Check Price |
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Rough Country 22-Gallon Fuel Cell Off-Road Ready 22-gallon capacity, steel, with foam baffling |
7.3 | 🛒 Check Price |
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Go Rhino 15-Gallon Rotomolded Fuel Tank Compact Choice 15-gallon capacity, rotomolded polyethylene, 20" x 12" x 14" |
7.6 | 🛒 Check Price |
1. RDS Manufacturing 30-Gallon Aluminum Fuel Tank: Best Overall
In our evaluation, the RDS Manufacturing 30-Gallon Aluminum Fuel Tank stands out for its robust build and thoughtful design. The welded aluminum construction resists rust and weighs less than comparable steel tanks, making it a favorite among off-roaders and long-haul drivers. Owners report that the included mounting brackets simplify installation, though some note that the fill neck placement may require minor adjustments depending on the truck bed layout. The locking cap adds a layer of security, and the internal baffles effectively minimize fuel slosh, which improves stability.
However, this tank is not ideal for those seeking a gravity-fed solution without a pump, as it is designed primarily for transfer pump systems. Also, the 30-gallon capacity may be overkill for daily drivers who only need occasional range extension. If you prioritize corrosion resistance and a lightweight build, this is a top contender, but budget-conscious buyers might find the price point higher than some steel alternatives.
- Welded aluminum tank with baffles for reduced fuel slosh
- Includes locking fuel cap and 2-inch NPT fill neck
- Mounting brackets and hardware included for easy installation
Pros: Corrosion-resistant aluminum is lighter than steel; Baffles help control fuel movement during driving
Cons: May require additional venting for some truck models
2. Transfer Flow 34-Gallon In-Bed Fuel Tank: Premium Pick
For those who need a fully legal on-road solution, the Transfer Flow 34-Gallon In-Bed Fuel Tank is a premium choice. We researched the certifications and found that it meets CARB and EPA standards, meaning you can use it without worry about emissions compliance. The steel body is built to last, with a powder coat finish that resists scratches and corrosion. Owner feedback frequently praises the accuracy of the mechanical fuel gauge and the secure locking cap. Installation is straightforward for those with basic mechanical skills, though the tank’s weight (over 100 pounds empty) makes it a two-person job.
The main drawback is the price and weight. This tank is one of the more expensive options, and the steel construction adds significant heft, which reduces payload capacity. If you don’t need CARB/EPA compliance or if weight is a major concern, a lighter aluminum tank might be a better fit. However, for peace of mind and durability, this is a strong performer.
- CARB and EPA certified for on-road use in all 50 states
- Dual-wall steel with powder coat finish for durability
- Includes mechanical fuel gauge and locking cap
Pros: Legal for on-road use across the U.S.; Heavy-duty steel construction with excellent impact resistance
Cons: Significantly heavier than aluminum alternatives
3. Scepter 20-Gallon Military Fuel Can: Best Portable
The Scepter 20-Gallon Military Fuel Can offers a different approach: portability. Based on owner feedback and the spec sheet, this HDPE container is nearly indestructible and immune to rust. It is ideal for those who want the flexibility to remove the tank when not needed or to use it for other purposes like water storage. The NATO-style nozzle provides a controlled pour, and the vented cap prevents airlock. We found that many owners use it as a backup for long trips rather than a permanent fixture.
However, it is not a fixed tank, so it can slide around in the bed if not secured with straps. Additionally, the 20-gallon capacity is smaller than most in-bed tanks, so it may not suit those needing extended range. If you prioritize versatility and lightweight storage over permanent installation, this is an excellent choice. But for a permanent solution, a mounted tank is more stable.
- High-density polyethylene (HDPE) construction resists dents and rust
- NATO-style nozzle with vented cap for controlled pouring
- Stackable design with integrated handles for easy transport
Pros: Lightweight and portable, no mounting required; Durable plastic won't corrode or dent
Cons: Not a permanent in-bed installation; may shift during off-roading
4. Titan Fuel Tanks 30-Gallon Diesel Tank: Best for Diesel
For diesel truck owners, the Titan Fuel Tanks 30-Gallon Diesel Tank is a purpose-built option. We compared its specifications to universal tanks and found the integrated pickup tube is a key advantage, allowing direct connection to the engine’s fuel system without additional modifications. The steel construction is tough, and the powder coat finish provides decent corrosion resistance. Owner feedback highlights the straightforward installation, though some note that the tank is heavy and may require reinforcement for the truck bed.
The primary limitation is that it is intended for diesel only; using it for gasoline could pose safety risks. Additionally, the steel tank is prone to rust if the coating gets scratched, so careful handling is required. If you drive a diesel and want a dedicated reserve tank, this is a solid choice. However, if you need a multi-fuel option or prefer aluminum, look elsewhere.
- Designed specifically for diesel fuel with a pickup tube
- Heavy-duty steel with black powder coat finish
- Includes mounting brackets and hardware
Pros: Integrated pickup tube simplifies connection to diesel engines; Rugged steel construction withstands harsh conditions
Cons: Not suitable for gasoline due to material compatibility
5. KEMIMOTO 18-Gallon Fuel Tank: Budget Pick
The KEMIMOTO 18-Gallon Fuel Tank is a budget-friendly entry that we researched for value-conscious buyers. Its HDPE plastic construction is lightweight and resistant to rust, and the included 12V transfer pump is a convenient addition for transferring fuel to the vehicle’s tank. Owner reviews often mention the ease of use, especially for occasional trips. The tank is compact enough to fit in most truck beds without taking up too much space.
However, durability is a concern. The plastic is not as impact-resistant as metal, and UV exposure can cause brittleness over time. Also, the pump’s alligator clips may not provide a secure connection on all battery terminals. This tank is best for light-duty use or as a temporary solution. If you plan to keep the tank in the bed for years or frequently drive off-road, a metal tank would be a wiser investment.
- Lightweight HDPE plastic with UV stabilizers
- Includes 12V transfer pump with alligator clips
- Two locking caps for secure filling
Pros: Very affordable compared to metal tanks; Built-in electric pump simplifies fuel transfer
Cons: Plastic may degrade over time with prolonged sun exposure
6. Rough Country 22-Gallon Fuel Cell: Off-Road Ready
The Rough Country 22-Gallon Fuel Cell is marketed for off-road use, and we evaluated its suitability based on owner feedback. The internal foam baffling does an excellent job of minimizing fuel slosh during rough terrain, which is a key benefit for off-roaders. The steel construction is sturdy, and the compact size allows it to fit in smaller beds or alongside other gear. Installation is relatively simple with the included straps.
However, the foam baffling is a double-edged sword. Over time, the foam can break down, potentially sending particles into the fuel system and clogging filters. Some owners have reported this issue after a few years. Additionally, the powder coat finish is less durable than professional-grade coatings. This tank is a good option for occasional off-road use, but for long-term reliability, a baffled metal tank without foam might be preferable.
- Steel construction with internal foam for slosh reduction
- Black powder coat finish for mild corrosion resistance
- Includes mounting straps and fuel cap
Pros: Foam baffling effectively reduces fuel slosh; Compact size fits smaller truck beds
Cons: Foam can degrade over time and clog filters
7. Go Rhino 15-Gallon Rotomolded Fuel Tank: Compact Choice
The Go Rhino 15-Gallon Rotomolded Fuel Tank is a compact solution for those who need minimal extra fuel without sacrificing bed space. We researched its construction and found rotomolded polyethylene to be highly durable and resistant to impacts and UV damage. Its low profile allows it to fit under most tonneau covers, which is a unique advantage. The included 12V pump and hose kit make fuel transfer straightforward, and owner feedback generally praises the ease of installation.
The obvious trade-off is the small capacity. With only 15 gallons, it adds limited range, making it more suitable for short trips or as an emergency reserve rather than a primary range extender. Additionally, the plastic body may not withstand heavy abuse as well as metal tanks. If you need a discreet, compact tank for occasional use, this is a great pick. But for serious long-distance travel, consider a larger capacity option.
- Rotomolded polyethylene is impact and UV resistant
- Low-profile design fits under tonneau covers
- Includes 12V pump and hose kit
Pros: Very compact and easy to store; Rotomolded plastic is tough and lightweight
Cons: Small capacity limits range extension
Frequently Asked Questions
Is it legal to carry a reserve fuel tank in my truck bed?
In most areas, carrying a reserve fuel tank in the truck bed is legal as long as it is properly secured and meets safety standards. However, some states have specific regulations regarding capacity, venting, and labeling. For on-road use, tanks should be CARB/EPA certified to avoid fines. We recommend checking local laws before purchasing.
How do I safely transfer fuel from the reserve tank to my vehicle?
You can use a manual siphon pump, a 12V electric transfer pump, or a gravity-fed system if the tank is mounted higher than the vehicle’s fuel filler. Always ground the pump to prevent static sparks, and avoid overfilling. Many reserve tanks come with a pump kit; follow the manufacturer’s instructions carefully.
What is the best material for a truck bed fuel tank: aluminum, steel, or plastic?
Aluminum is lightweight and corrosion-resistant but can be more expensive. Steel is extremely durable and impact-resistant but heavy and prone to rust if the coating is damaged. Plastic (HDPE or polyethylene) is lightweight, rust-proof, and affordable but less impact-resistant and can degrade with UV exposure. Your choice should depend on your budget, weight tolerance, and typical use conditions.
How do I secure a fuel tank in my truck bed?
Most permanent tanks come with mounting brackets that bolt to the bed floor or side walls. Portable tanks should be strapped down using ratchet straps or cargo bars to prevent movement. Ensure the tank does not block your view or interfere with other cargo. Also, consider using a locking cap to deter theft.
Can I use a diesel reserve tank for gasoline?
It is not recommended unless the tank is explicitly rated for both fuels. Diesel and gasoline have different chemical properties; a tank designed for diesel may not have the proper materials or venting for gasoline, posing a fire risk. Always use a tank that is certified for the fuel type you intend to store.
Our Verdict
After comparing specifications, safety certifications, and owner feedback, our top pick is the RDS Manufacturing 30-Gallon Aluminum Fuel Tank for its excellent balance of lightweight durability, corrosion resistance, and ease of installation. For those who need full on-road legality and maximum toughness, the Transfer Flow 34-Gallon In-Bed Fuel Tank is a close runner-up, provided you can handle the extra weight and cost.
