Our readers keep the lights on and my morning glass full of iced black tea. As an Amazon Associate, I earn from qualifying purchases.13 Best 500 Gallon Diesel Fuel Tank | Diesel Range, One Tank

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The Dee Zee DZ92656B delivers 111 gallons of diesel capacity integrated with a lockable toolbox, making it the most functional single-unit solution for service trucks and heavy-duty pickups. Constructed from .125-inch brite-tread aluminum with a protective black powder coat, this L-shaped tank resists corrosion while adding substantial storage for chains, binders, and tools directly above the fuel load.

Real-world owner reports confirm the tank holds approximately 100 gallons without leaks, and the lightweight aluminum build simplifies installation compared to steel alternatives of similar volume. The 56.25-inch width fits full 8-foot beds with room to spare, and the included -6 to 3/8 bung fitting simplifies pump connection. Some units have arrived with minor shipping damage, but Dee Zee’s warranty support has replaced entire assemblies when issues like pinhole welds appeared.

The black powder coat finish holds up well against UV and road debris, though the mounting brackets can fatigue under extreme vibration over tens of thousands of miles. Adding a rubber isolation pad between the tank and bed reduces bracket stress significantly.

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The RDS 73326 is a fully welded aluminum transfer tank paired with a toolbox and an integrated 8 GPM 12V pump, offering a turnkey fueling solution for truck owners who want minimal assembly. The spin-collar pump mount simplifies installation, and the stainless steel hardware resists the corrosion that plagues lesser fasteners around diesel spills.

Owners highlight the sturdy construction and easy assembly, though packaging is a recurring concern—single-layer cardboard has led to dented panels and bent brackets during transit. The latches on the toolbox lid are functional but feel light-duty; some owners bend the lid slightly to improve the seal. Adding a short vent hose prevents fuel burping during hard cornering.

Once installed, the 8 GPM pump delivers reliable fuel transfer for tractors, excavators, and service truck auxiliary tanks. The combo eliminates the need for separate toolboxes, freeing bed space while keeping chains and straps locked away.

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At 92 gallons, the Dee Zee DZ92647B offers a slightly smaller footprint than its 111-gallon sibling while retaining the same brite-tread aluminum construction and integrated toolbox design. The 46.75-inch width makes it compatible with shorter bed trucks, and the black powder coat finish matches most truck aesthetics without looking aftermarket.

Real-world users report packing 15 chains, binders, a full-size floor jack, and multiple socket sets in the toolbox compartment while the tank holds fuel without leaks. The unit arrives fully assembled; owners need only bolt it into the bed and connect their pump and filler lines. Shipping damage is less frequent than with larger units, and when it occurs, Dee Zee’s customer service addresses replacements promptly.

The mounting brackets are the same design as the 111-gallon version, meaning the same vibration fatigue risk applies over high-mileage use. Adding thick rubber strips between the tank and the truck bed extends bracket life considerably.

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The AM-TANK 116-gallon unit is a rotomolded polyethylene tank engineered for high-volume diesel storage with a built-in 12V DC pump rated at 12 GPM. The integrated forklift pockets, ratchet strap recesses, and lockable weather cover make this a practical choice for open-bed trucks where the tank stays installed long-term.

Owners report pumping 100 gallons into a bulldozer in a quarter of the time a hand pump would take, and the three-effect air vent on the 2-inch fill cap prevents pressure buildup during hot weather. The IP55-rated pump handles a 30-minute duty cycle, which is sufficient for topping off multiple machines in one session. Some users add solar trickle chargers to keep the battery topped up when the truck isn’t running.

The polyethylene construction won’t rust or dent like aluminum, but the tank sits high enough that rear visibility is partially blocked in a short bed. The fuel level indicator provides a rough estimate, but owners note it isn’t perfectly linear—manual tracking is still advised for critical fuel audits.

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The AM-TANK 58-gallon diesel transfer tank is a self-contained fueling station designed to fit underneath truck tonneau covers while maintaining a low profile. The rotomolded polyethylene body houses a 12V pump (12 GPM, 300W, 22A), a particulate and water separator filter, a 13-foot hose, and an automatic nozzle—everything needed to start pumping diesel immediately.

Owners consistently praise the build quality, noting it feels far more robust than low-cost brands like Vevor. The locking lid protects the pump and gauge from weather and theft, while the integrated handles make positioning manageable when empty. The fuel level indicator is functional but not precision-grade—some users report it reads optimistically compared to actual fuel remaining.

Pump failures have been reported by a small subset of owners, typically after fewer than 300 gallons pumped. In most cases, the pump is replaceable with a standard Fill-Rite unit, and the tank itself remains serviceable. For intermittent farm or ranch use, the included pump performs well; high-volume commercial users may want to budget for an aftermarket pump upgrade.

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The RDS 72743 combines a 60-gallon diamond-plate aluminum fuel tank with a top-mounted toolbox, offering dual utility for truck owners who need storage without sacrificing fuel capacity. The polished diamond-plate finish grabs attention, but the functional benefits are more significant: the integrated toolbox keeps straps, tools, and safety gear organized and locked, while the tank itself gravity-feeds or connects to a pump for active transfers.

Installation feedback is mixed—some owners with 8-foot beds reported a smooth two-hour setup using a diesel install kit, while others on short-bed Ford F-250s had to offset the tank from the fuel line side to accommodate fifth-wheel hitches. The actual usable capacity clocks in closer to 52–53 gallons due to internal baffling and fill neck design, which is worth noting if you’re calculating range precisely.

Shipping damage is a recurring theme: bent sides, stuck latches, and dented diamond plate are common complaints. The lid opens automatically under gas shock tension, which can be startling but works reliably. The valve included with the tank is brass, which performs well with diesel but some owners swap it for a higher-flow unit.

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The RDS 71791 is a 91-gallon rectangular aluminum transfer tank built for long-haul diesel storage in pickup beds. At 57 inches long, 29 inches wide, and 19 inches tall, it fits most short-bed trucks while leaving room for fifth-wheel hitches. The fully welded aluminum construction eliminates rust concerns, and the tank includes mounting bolts, springs, and rubber isolation strips.

Owners running gravity feed systems with electric valves have logged over 20,000 gallons through this tank with zero failures, a testament to the weld quality and material thickness. Fits under tonneau covers without modification, and the rectangular shape allows efficient use of bed space. Some units arrive with a bent mounting tab from shipping, but the structural integrity of the tank itself holds up.

The tank ships without a pump, pickup tube, hose, or nozzle, so buyers need to budget for a separate transfer system. The mounting tabs lack pre-drilled holes in some production runs, requiring a drill and self-tapping screws for installation. Despite these omissions, the core tank is a workhorse for those who want to customize their pump setup.

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The JohnDow JDI-AFT58 is a 58-gallon linear polyethylene transfer tank with a factory-integrated 12V pump and automatic shut-off nozzle, providing a complete fueling solution out of the box. The pump delivers 10 GPM, which is slightly slower than the AM-TANK but still capable of filling a standard truck tank in under 5 minutes. The 13-foot hose and power cables offer good reach for most setups.

Owners praise the lightweight design—at 56 pounds empty, one person can load and unload it from the truck bed easily. The integrated forklift pockets and strap recesses make transport and tie-down straightforward. Some initial debris was found in the first few gallons of fuel, likely manufacturing residue, so using a screen filter during the first fill is recommended.

The tank sits relatively low in the bed but the pump housing on top raises the overall height slightly, which may interfere with some tonneau covers. The protective lockable cover keeps the pump and nozzle secure, and the automatic shut-off nozzle prevents overfills—a key safety feature for unattended transfers.

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The RDS 71212 is a 60-gallon aluminum tank with a slim 13-inch height, purpose-built for fitting under tonneau covers while maintaining a low center of gravity. Its unique dimensions (56 x 13 x 19.25 inches) make it one of the few tanks that can coexist with a fifth-wheel slider in a short bed Ford F-250 while still offering meaningful fuel capacity.

Owner reviews confirm the tank holds about 50 gallons of usable fuel, with the remaining volume consumed by headspace and internal baffling. The lightweight aluminum construction (61 pounds empty) allows one person to slide it into position. The tank comes with all mounting hardware, but buyers need to source a filler hose adapter and fuel filters separately.

A known issue: the fuel gauge on some units reads between 1/4 and 1/2 regardless of actual fuel level, limiting its usefulness for inventory tracking. For gravity-fed setups, the tank works flawlessly, and the slim profile means it stays out of the way even under roll-up tonneau covers.

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The RDS 71083 is a 45-gallon rectangular aluminum auxiliary tank that serves as a budget-friendly entry point for diesel capacity expansion. With fully welded seams and a machined finish, the build quality exceeds expectations at its tier. The tank’s 42-pound empty weight makes it one of the lightest options for a single-user install.

Installed on a 2016 Ram 3500, the tank fit snugly with an install kit and took under two hours to mount. The billet aluminum fuel cap feels premium, and the tank sits slightly above the bed rails—enough to see over without blocking the rear view. Owners towing fifth-wheels appreciate the space-saving rectangular shape.

Shipping packaging is minimal; some units arrive with bent mounting brackets that require hammering back into shape. The 45-gallon capacity means the tank sits below the typical 50-gallon threshold many diesel truck owners target for extended range, but for short-haul operations or as a supplementary tank, it delivers reliable performance.

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The RomoTech 550-gallon polyethylene storage tank is designed for stationary farm, industrial, or emergency water storage rather than mobile diesel transport. While not a diesel transfer tank per se, its UV-stabilized construction, rustproof polyethylene, and BPA-free material make it a viable option for dedicated diesel storage in a fixed location when equipped with the proper fittings.

The tank’s heavy-duty medium-density polyethylene wall resists cracking and warping in direct sun exposure, and the molded-in gallon and liter markings allow easy visual level checks. The 5-1/2-inch fill cap provides fast filling, while the 2-inch NPT outlet bulkhead fitting connects to standpipes or pumps for dispensing.

Owners using it for RV water or agricultural liquid storage report it works as intended, with thick walls and stable leg channels for tie-down during transport. At 160 pounds empty, it’s heavy enough to stay put but manageable with a trailer. Note that this is not a diesel-specific tank—if using for diesel, ensure the polyethylene is compatible with the fuel’s chemical properties.

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The RDS 72771 is a straightforward 60-gallon aluminum tank for basic diesel storage in truck beds. Designed for exterior areas, the tank includes a locking automotive-style fill cap and a machined exterior finish that resists corrosion. At 91 pounds empty, it’s heavier than poly alternatives but still manageable with two people.

Owners report actual capacity closer to 57 gallons, with the pump shut-off activating at 52 gallons before foam settles and another 5 gallons can be added. The tank fits under tonneau covers with ease, providing convenient access for filling. Installation is straightforward with an install kit, though some owners noted bolt alignment issues that required minor bracket modification.

The simple design lacks integrated pumps, toolboxes, or gauges—this is a basic tank for users who want to add their own transfer system. The aluminum construction ensures it won’t rust, but the 55 x 20 x 12.75-inch footprint limits fifth-wheel compatibility in short beds.

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The Wellmate WM-14 is a 47.1-gallon captive air fiberglass well pressure tank, entirely unrelated to diesel fuel storage but included here for completeness in the data set. This tank uses a replaceable air cell to maintain water pressure in residential well systems, providing greater drawdown than comparably sized steel tanks without the rust risk common in coastal or corrosive water environments.

Owners highlight the easy installation with the included Quick Connect hardware and the convenience of a replaceable bladder that avoids draining and replacing the entire tank when the bladder fails. Setting the pre-charge pressure 2 psi below the pump cut-in pressure is straightforward, and the fiberglass shell won’t corrode or sweat like galvanized steel alternatives.

Some users report bladder failure and water leakage from the top air valve after 2–3 years of service, suggesting the long-term durability of the diaphragm could be improved. The 47-gallon size is well-suited for deep-well applications with larger drawdown needs, but it lacks the capacity and chemical compatibility for diesel fuel storage.