Mounting a fuel cell in a truck bed transforms a pickup into a self-sufficient workhorse, eliminating detours for diesel or gasoline when you are running equipment, towing heavy loads, or working remote job sites. The decision comes down to tank material, capacity range, pump integration, and how the unit fits around fifth-wheel hitches or toolboxes.
I’m Amir — the founder and writer behind Four Wheel Ask. My approach involves studying material specifications, weld quality reports, customer feedback patterns, and pump performance data across dozens of tank models to identify which designs hold up under real-world abuse.
Auxiliary fuel capacity in a pickup demands more than just extra gallons; it requires a tank that resists corrosion, handles road vibration, and integrates safely with your existing fuel system. Choosing the optimum best fuel cell for truck bed requires careful evaluation of material durability, capacity range, pump compatibility, and bed fitment.
How To Choose The Best Fuel Cell For Truck Bed
Selecting a bed-mounted fuel cell involves balancing capacity against physical footprint, material durability against cost, and pump requirements against intended fuel type. The following factors separate a long-term investment from a repeated replacement cycle.
Tank Material and Corrosion Resistance
Aluminum tanks dominate the premium segment because they resist rust, weigh less than steel, and handle most fuel types including diesel, gasoline, and biodiesel blends. Steel tanks offer lower upfront cost and excellent strength but require a corrosion-resistant coating, especially in humid or road-salt environments. Polyethylene (HDPE) tanks are lightweight, dent-resistant, and chemically inert, making them popular for portable tank-and-pump combos, though they lack the rigidity of metal for permanent bed mounting.
Capacity, Dimensions, and Bed Fitment
Capacity ranges from roughly 36 gallons to over 100 gallons, but physical dimensions dictate what fits your specific truck bed. Measure length, width, and height carefully — especially if you run a fifth-wheel or gooseneck hitch that requires bed clearance. Rectangular tanks with low profiles preserve rear visibility and leave room for toolboxes. Vertical or cylindrical tanks save floor space but may interfere with tonneau covers.
Pump Integration and Flow Rate
Integrated 12-volt transfer pumps simplify refueling of equipment or secondary vehicles, with flow rates typically between 10 and 15 gallons per minute. Look for thermal overload protection, a quality filter system, and an automatic shut-off nozzle to prevent overfills. If you plan to gravity-feed or use an external pump, ensure the tank bungs are compatible with standard NPT fittings.
Safety Features and Certifications
Baffles inside the tank prevent fuel slosh and reduce stress on welds during transport. Lockable caps deter theft and contamination. Overfill restriction ports stop pump nozzles automatically at the station. Vent caps must be opened during use and closed during travel to prevent pressure buildup or leaks. Some tanks carry DOT or CARB compliance labels — check local regulations for road-legal auxiliary fuel storage.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| RDS 71083 | Transfer Tank | Long-haul towing | 45 Gal Aluminum | Amazon |
| Trailfx 36 Gal | Transfer Tank | Compact bed fit | 36 Gal Vertical Aluminum | Amazon |
| DEE ZEE DZ92556B | Transfer Tank | Fifth-wheel clearance | 76 Gal Aluminum | Amazon |
| Fill-Rite FR1210H | Fuel Pump | Fast fuel transfer | 15 GPM Cast Iron | Amazon |
| VEVOR 48 Gal | Tank + Pump | Complete diesel system | 48 Gal HDPE with Pump | Amazon |
| TTR46 | Transfer Tank | Multi-fuel compatibility | 46 Gal Aluminum | Amazon |
| Better Built 36 Gal | Transfer Tank | Budget steel build | 36 Gal Alloy Steel | Amazon |
| RDS 72771 | Transfer Tank | Large diesel capacity | 60 Gal Aluminum | Amazon |
| LAPPPLSP 48 Gal | Tank + Pump | All-in-one gasoline rig | 48 Gal Polyethylene with Pump | Amazon |
| Landrol 58 Gal | Transfer Tank | High-volume diesel storage | 58 Gal Aluminum | Amazon |
| Dee Zee DZ91753 | Transfer Tank | Maximum capacity | 110 Gal Aluminum | Amazon |
In-Depth Reviews
1. RDS MFG INC 71083 Rectangular Auxiliary/Transfer Fuel Tank
The RDS 71083 delivers a refined balance of capacity, build quality, and fuel-type versatility that suits both gasoline and diesel applications. Constructed from fully welded aluminum with no rust concerns, this 45-gallon rectangular tank fits long-bed pickups while leaving room for fifth-wheel towing setups. Owner feedback consistently highlights the clean billet-style locking cap and the straightforward installation process, though the fill neck requires careful measurement and cutting for a precise hose fit.
Gasoline auxiliary fueling is permitted when using an electric pump to siphon from the top, giving this tank broader utility than diesel-only units. The aluminum construction keeps weight manageable at 42 pounds, and the tank sits above the bed rails on most modern trucks, so bed space underneath remains usable. Experienced owners report that the included mounting instructions are minimal, but RDS phone support provides helpful guidance for first-time installers.
Reports from Ram 2500 and 3500 owners indicate that the 45-gallon capacity adds roughly 400 miles of range depending on load and terrain, making it a practical choice for extended towing trips. The tank’s low-profile rectangular shape integrates well with tonneau covers and toolboxes, and the corrosion-free aluminum body eliminates the surface rust issues seen on painted steel alternatives. For a premium yet attainable auxiliary tank, this model checks the critical boxes.
What works
- Rust-free aluminum construction with fully welded seams
- Compatible with both gasoline and diesel fuel types
- Great owner reviews for build quality and fitment
What doesn’t
- Fill neck customization requires cutting metal tubing
- Shipped with minimal packaging — brackets may bend
2. Trailfx 36 Gallon Vertical Industrial Series Aluminum Transfer Tank
The Trailfx 36-gallon vertical aluminum transfer tank stands out for its space-efficient footprint, designed specifically for truck beds that also need to accommodate a fifth-wheel hitch. At 11 inches wide and 17 inches tall, this tank uses vertical height rather than floor space, preserving valuable bed length for equipment or gooseneck trailers. The aluminum body eliminates rust concerns, and the unit carries a Class 3 label suitable for diesel transport.
Owner reports confirm that the tank fits well in short-bed and long-bed configurations alike, with several users running excavators and skid steers relying on the extra diesel capacity for extended job-site hours. The low silhouette does not block rear visibility significantly, and the tank’s orientation allows easy access to the fill point and fuel outlet. Some buyers noted that the packaging during shipping left the tank vulnerable to cosmetic damage, and the mounting tabs occasionally arrived bent.
A recurring point of contention among owners is capacity accuracy — several users measured actual fill volume closer to 25 gallons rather than the advertised 36 gallons, which may reflect dimensional tolerances or fill-level calibration. For buyers who need a compact, rust-proof tank for diesel storage and do not require the full rated capacity, this unit delivers quality aluminum construction in a bed-friendly form factor. Verify your fill expectations before purchasing if exact gallon capacity is critical.
What works
- Compact vertical design preserves bed floor space for hitches
- Rust-proof aluminum body with clean industrial finish
- Positive owner feedback for fit and durability
What doesn’t
- Some units hold less than the advertised 36 gallons
- Packaging during shipping can damage tabs and finish
3. DEE ZEE DZ92556B Transfer Tank
The DEE ZEE DZ92556B combines generous 76-gallon capacity with intelligent engineering for fifth-wheel trailer clearance. The 0.125-inch brite-tread aluminum sheet resists corrosion and maintains a professional appearance, while the radius-curved corners eliminate high-stress weld points that can crack under vibration. Three internal stability baffles control fuel slosh during acceleration and braking, and the included drain plug simplifies periodic cleaning or water removal.
Mounting tabs are designed to secure the tank to the truck bed floor, though several owners reported needing to modify the tab positions to clear boxed-frame rails on modern pickups. The tank ships with assembly hardware and installation components, but the lack of a dedicated fill neck or pump means buyers must plan their own fuel delivery system. Owners running automated fuel systems have added 12-volt solenoids with manual shut-off valves for remote transfer control.
Feedback from short-bed Ford and Ram owners highlights the tank’s compact 59 x 21 x 21-inch footprint relative to its capacity, making it one of the most space-efficient large-volume options on the market. The brite-tread aluminum finish holds up well to weather exposure, and the tank’s weight of 55 pounds keeps the overall payload impact reasonable. Surface-level quality issues, including a reported weld leak in one unit, suggest careful inspection upon delivery is warranted.
What works
- Massive 76-gallon capacity in a compact, hitch-friendly shape
- Radial curve welds and three baffles improve structural integrity
- Lightweight brite-tread aluminum resists rust
What doesn’t
- Mounting tabs may need modification for boxed-frame beds
- Occasional weld or leak issues reported upon arrival
4. Fill-Rite FR1210H 12V 15 GPM Fuel Transfer Pump
The Fill-Rite FR1210H is a dedicated 12-volt fuel transfer pump built for permanent bung mounting on truck bed tanks, delivering 15 gallons per minute through rotary vane technology. The cast-iron housing withstands rough operating conditions far better than aluminum pumps, which have been known to crack from prolonged vibration. Thermal overload protection prevents motor damage during extended running, and the 180-degree rotating junction box simplifies wiring in tight bed installations.
This pump includes a 12-foot discharge hose, a 3/4-inch manual nozzle, a 34-inch telescoping suction pipe, and an 18-foot power cable, providing everything needed for a complete transfer system except the tank itself. The universal fit works with standard NPT threads, and the pump can pull fuel from depths of 8 feet and discharge up to 37 feet of head. Owners replacing failed aluminum pumps consistently note the cast iron build is noticeably more robust and delivers quieter, more consistent flow over time.
One trade-off is the finish — multiple owners in coastal or high-humidity regions report surface rust forming on the cast iron body within weeks of installation. The pump is loud during operation, typical for vane-style units, but the fast transfer speed compensates for the noise. The included manual nozzle feels less substantial than the pump itself, and some users recommend upgrading to an automatic shut-off nozzle for automated refueling setups. For a pump that prioritizes durability and flow rate, the FR1210H is a benchmark choice.
What works
- Heavy-duty cast iron construction outlasts aluminum pumps
- Consistent 15 GPM flow with thermal overload protection
- Comprehensive kit includes hose, nozzle, and suction pipe
What doesn’t
- Cast iron body prone to surface rust in humid climates
- Manual nozzle feels flimsy relative to pump quality
5. VEVOR Portable Diesel Tank 48 Gallon
The VEVOR 48-gallon portable diesel tank offers a complete refueling solution out of the box, pairing a high-density polyethylene tank with a 12-volt transfer pump, 13.1-foot hose, and automatic shut-off nozzle. The HDPE construction resists UV degradation, impacts, and corrosion from diesel fuel, making it suitable for outdoor storage on trucks, trailers, or job sites. A duplex filter system — one inside the tank for large particles and a secondary external filter for fine contaminants — helps deliver cleaner fuel to equipment.
The 10.6 GPM flow rate is slightly lower than premium pump combos, but the automatic shut-off nozzle eliminates overfill spills, and the integrated mechanical fuel gauge lets you monitor remaining capacity at a glance. The orange color improves visibility, and the copper lockable lid adds security against theft. Forklift pockets integrated into the base allow stable lifting when loading the tank into a truck bed, and the two side grooves provide secure handholds for positioning.
This system is purpose-built for diesel only, so gasoline users should look elsewhere. The polyethylene tank body, while durable, lacks the rigidity of aluminum for permanent mounting and is best suited for portable or semi-permanent use. Owners in construction and agricultural settings appreciate the complete kit nature — no need to source separate pumps, hoses, or nozzles. For a budget-conscious buyer who needs a turnkey diesel transfer system, this combination delivers strong functional value.
What works
- Complete system with pump, hose, nozzle, and filters included
- Durable HDPE tank resists corrosion and UV damage
- Automatic shut-off nozzle prevents overfill spills
What doesn’t
- Diesel-only compatibility limits fuel type flexibility
- Polyethylene body less rigid than aluminum for permanent mounts
6. TTR46 Rectangle Refueling Tank 46 Gallon
The TTR46 from Aluminum Tank Industries provides a straightforward 46-gallon rectangular refueling tank built for multiple fuel types including gasoline, diesel, and even propane. The all-aluminum body eliminates rust as a long-term concern, and the United States manufacturing origin appeals to buyers who prioritize domestic production. Tank dimensions of 62 inches long by 20 inches wide by 14 inches tall fit full-size truck beds with room to spare, and the 64-pound weight is manageable for two-person installation.
This tank ships as a bare unit without a pump, fill neck, or hose kit, giving buyers the flexibility to configure their own fuel delivery system based on specific needs. The rectangular shape works well for permanent bed mounting and integrates cleanly with existing toolboxes or bed caps. The vehicle-specific fit designation means compatibility varies by truck model, so verifying bed dimensions against the tank footprint before ordering is essential.
Dealer and owner feedback remains limited for this specific model, but the construction standards from Aluminum Tank Industries are consistent with their reputation for clean welds and proper sealing. The multi-fuel capability is a genuine advantage if you need to switch between gasoline and diesel applications — just ensure proper cleaning between fuel type changes. For buyers who prefer a bare, high-quality aluminum tank and want to custom-build the rest of the system, the TTR46 offers a solid foundation.
What works
- Multi-fuel compatible — works with gasoline, diesel, and propane
- Rust-free aluminum construction made in the USA
- Generous 46-gallon capacity in a bed-friendly rectangle shape
What doesn’t
- Ships as a bare tank — no pump or fill hardware included
- Limited owner review history for long-term validation
7. Better Built Steel Transfer Fuel Tank 36-Gallon
The Better Built 36-gallon steel transfer tank brings a traditional, heavy-duty approach to truck bed fuel storage with a glossy black alloy steel body and a 3-year warranty. The 2-inch flush-mounted inlet and outlet bungs support fast flow rates, and the built-in overfill restriction automatically shuts off the pump nozzle at the station to prevent spills. Internal baffles add structural strength and reduce fuel movement during transport, while the lockable cap provides basic security.
Owner feedback confirms the tank is well-constructed with clean welds and good durability once installed, but the steel body requires attention to prevent rust, particularly if the gloss coating gets scratched during shipping or installation. Several buyers reported that the tank arrived with a damaged box, bent mounting tabs, or missing hardware — including one order of three tanks that arrived with only one mounting kit. The packaging appears insufficient for the tank’s weight, leading to cosmetic or structural damage in transit.
A notable omission is the lack of a drain plug, which complicates periodic water or sediment removal from the tank bottom. One creative owner welded in a 1/4 NPT bushing to create his own drain. The tank is listed for diesel fuel, but the steel construction and lockable cap make it adaptable for other fuels with proper compatibility checks. For buyers on a tighter budget who accept the risk of shipping damage and plan to protect the steel finish, this tank offers solid capacity at a reasonable entry point.
What works
- Sturdy steel construction with internal baffles for stability
- Overfill restriction and lockable cap add safety and security
- Competitive capacity at a budget-friendly price point
What doesn’t
- No drain plug for sediment or water removal
- Shipping packaging inadequate — frequent damage reports
8. RDS MFG INC 72771 Fuel Tank 60 Gallon
The RDS 72771 expands on the brand’s proven aluminum tank design with a 60-gallon capacity suited for diesel truck owners who need substantial range without stepping up to the largest chassis-mount systems. The aluminum body eliminates rust, and the locking automotive-style fill cap provides a familiar, secure seal similar to OEM fuel doors. At 55 inches long, 20 inches wide, and 12.75 inches tall, this tank fits most long-bed pickups and leaves clearance for gooseneck hitch hardware.
The universal fit designation works across multiple truck brands, but the vehicle-specific fit nuance means checking bed dimensions against the tank footprint is advisable before purchase. The tank weighs 91 pounds empty, so a two-person lift or mechanical assistance is recommended during installation. RDS does not include a pump or transfer system with this model, so buyers must source their own fuel delivery components — though the tank’s bungs are NPT-threaded for standard pump and fitting compatibility.
This model targets diesel applications specifically, and the machined aluminum finish gives it a clean, professional look that holds up well to weather and road debris. Owner feedback is limited for this particular SKU, but RDS has a solid reputation in the auxiliary tank market for consistent weld quality and reliable sealing. For a mid-to-large capacity aluminum tank from a known manufacturer, the 72771 represents a straightforward volume upgrade for diesel truck owners who want rust-free storage.
What works
- Large 60-gallon capacity in a bed-friendly aluminum body
- Locking automotive-style cap provides secure, familiar sealing
- Rust-free aluminum construction with solid brand reputation
What doesn’t
- Heavy empty weight — requires two-person lift or assist
- No pump or transfer hardware included
9. LAPPPLSP Portable 48 Gallon Fuel Tank with Pump
The LAPPPLSP 48-gallon system combines a polyethylene fuel tank with a 12-volt self-priming pump rated at 15 GPM, creating a complete mobile refueling station for gasoline, diesel, and kerosene. The tank body uses petrol-grade polyethylene that resists corrosion, denting, and UV damage, while the recessed design accommodates the pump on the left side and idle tools on the right. The included 13.1-foot delivery hose and 3.3-foot suction hose provide solid reach for most refueling scenarios.
This system is designed for off-road equipment, agricultural machinery, ATVs, and motorcycles, but the nozzle does not fit standard passenger car filler necks — a notable limitation if you plan to refuel your daily driver. The pump connects directly to a 12-volt battery via included clamps, and the operation sequence requires connecting power before switching the pump on, then disconnecting power after shut-off to prevent accidental operation. Owners must loosen the vent cap during use and tighten it afterward to prevent pressure buildup or tank deformation.
Several operational precautions are worth noting: the vent screw should be loosened regularly because fuel vapor pressure, especially from gasoline, can distort the polyethylene tank if not properly vented. All connections should be checked and tightened before first use, as shipping vibrations can loosen clamps and fittings. For a turnkey tank-and-pump package at a competitive price point, this unit delivers functional capability, but the plastic tank construction and small-car incompatibility limit its use case to equipment and recreational vehicles.
What works
- Complete system with 15 GPM pump and 13-foot hose
- Durable polyethylene tank resists corrosion and dents
- Runs on gasoline, diesel, or kerosene for flexibility
What doesn’t
- Nozzle does not fit standard passenger car fill necks
- Polyethylene tank requires careful venting to prevent distortion
10. Landrol 58 Gallon Aluminum Fuel Cell Tank
The Landrol 58-gallon aluminum tank offers a high-volume storage solution for diesel and kerosene at a compelling price point, with dimensions of 59 inches long by 13 inches wide by 17 inches tall. The slim 13-inch width allows this tank to fit in beds where wider rectangular tanks would interfere with wheel wells or hitch rails. Included components — fuel pipes, vent covers, and a sending unit — enable connection to a fuel gauge for monitoring remaining capacity, a feature often reserved for more expensive models.
The aluminum construction resists rust and keeps weight lower than steel alternatives of similar capacity, though the tank is specifically prohibited for gasoline or methanol use, limiting its application to diesel and kerosene storage only. Manual welding of joints and reinforcing covers suggests a fabrication approach that prioritizes strength, but the overall fit and finish may vary compared to mass-produced stamped tanks. The universal fit type means the tank can be adapted to most truck beds with appropriate mounting hardware.
Buyer reviews are currently limited for this model, so long-term durability data is sparse. The tank’s narrow profile is a genuine advantage for trucks with limited bed width, and the inclusion of a sending unit simplifies fuel level monitoring. For diesel truck owners who need maximum gallon capacity in a slim aluminum package and do not require gasoline compatibility, this unit delivers substantial volume at an accessible price. Verify mounting tab positions and bed dimensions before ordering to ensure a clean installation.
What works
- Slim 13-inch width fits narrow bed spaces and hitch configurations
- Includes sending unit for fuel gauge connectivity
- Rust-free aluminum body with large 58-gallon capacity
What doesn’t
- Not compatible with gasoline or methanol fuels
- Limited owner review history for long-term validation
11. Dee Zee DZ91753 Rectangle Transfer Tank 110 Gallon
The Dee Zee DZ91753 sits at the top of the capacity range with a massive 110-gallon rectangular tank built from 0.125-inch brite-tread aluminum. At 48 inches long, 24 inches wide, and 24 inches tall, this tank occupies a significant portion of the truck bed but delivers enough fuel storage to run heavy equipment for days without refueling. The radius-curved corners eliminate sharp weld stress points, and the brite-tread aluminum surface resists corrosion while providing a non-slip texture.
This tank includes a cap and coupler for venting, along with mounting tabs to secure the unit to the bed floor. The capacity is substantial enough that full fuel weight approaches 700 pounds, so verifying your truck’s payload rating before installation is critical. The rectangular shape and 24-inch height mean this tank will sit above the bed rails on most pickups, which may limit tonneau cover compatibility and rear visibility.
The DZ91753 is designed for gasoline use, though the aluminum construction and included venting hardware make it adaptable for diesel with proper cleaning between fuel types. The tank does not include a pump or transfer system, given the intended use as a bulk storage and gravity-feed or external-pump reservoir. For commercial operators, farmers, or fleet managers who require the absolute maximum onboard fuel capacity in a single tank, this Dee Zee model provides the volume and corrosion resistance needed for years of heavy service.
What works
- Industry-leading 110-gallon capacity for maximum range
- Durable brite-tread aluminum with radius-curved corners
- Includes vent cap and mounting tabs for secure installation
What doesn’t
- Full tank weight near 700 pounds impacts payload significantly
- 24-inch height sits above bed rails on most trucks
Hardware & Specs Guide
Aluminum vs Steel vs Polyethylene
Aluminum is the dominant material for permanent bed-mounted fuel cells because it resists corrosion without coatings, weighs roughly one-third less than steel, and handles diesel, gasoline, and biodiesel with no chemical degradation. Steel tanks cost less upfront and offer high impact resistance, but any scratch through the paint layer becomes a rust initiation point, especially in salt-belt climates. Polyethylene (HDPE) tanks are the lightest option and completely corrosion-proof, making them ideal for portable or semi-permanent installations, though they lack the rigidity for heavy-duty bed mounting and can deform under pressure if venting is neglected.
Baffle Systems and Fuel Stability
Internal baffles serve two critical functions: they prevent fuel from sloshing violently during acceleration, braking, or cornering — which reduces strain on tank welds and mounting tabs — and they add structural rigidity to the tank walls. Premium aluminum tanks typically include three or more baffles, while budget units may use fewer or omit them entirely. For trucks that carry fuel while towing or off-roading, a well-baffled tank significantly improves handling predictability and reduces the risk of weld fatigue over time.
Pump Compatibility and Flow Rates
Transfer pumps rated between 10 and 15 GPM are standard for truck bed fuel cells. Cast iron pumps (like the Fill-Rite FR1210H) offer superior vibration resistance and longevity compared to aluminum-bodied pumps, but they are heavier and prone to surface rust. Polyethylene tank systems with integrated pumps prioritize portability and corrosion resistance but generally use lighter-duty pump assemblies. Always match the pump’s inlet size and thread type (typically 1-inch NPT) to the tank bung for a leak-free seal.
Mounting and Installation Considerations
Permanent tank installation requires securing the unit to the truck bed floor using mounting tabs or brackets, typically bolted through the bed sheet metal. Reinforcing the bed with backing plates or cross-members is recommended for tanks over 50 gallons due to the dynamic load of fuel during movement. Tanks that sit above the bed rails can interfere with tonneau covers and reduce rear visibility, while low-profile designs preserve clearance for fifth-wheel and gooseneck hitches. Always use thread sealant on NPT fittings and verify fuel line routing to avoid chafing against bed edges.
FAQ
Can I use a fuel cell for gasoline in my truck bed?
How do I properly vent a truck bed fuel tank?
What size fuel cell fits in a standard truck bed?
Do I need a pump for a truck bed fuel cell?
Are truck bed fuel cells legal for road use?
Final Thoughts: The Verdict
For most buyers, the best fuel cell for truck bed winner is the RDS MFG INC 71083 because it combines rust-free aluminum construction, dual-fuel compatibility, and a practical 45-gallon capacity that fits long-bed trucks without sacrificing hitch clearance. If you want integrated pump convenience with automatic shut-off, grab the VEVOR 48 Gallon for a complete diesel system. And for maximum range with premium build quality, nothing beats the Dee Zee DZ91753 with its 110-gallon brite-tread aluminum design.
Certification: BSc in Mechanical Engineering
Education: Mechanical engineer
Lives In: 539 W Commerce St, Dallas, TX 75208, USA
Md Amir is an auto mechanic student and writer with over half a decade of experience in the automotive field. He has worked with top automotive brands such as Lexus, Quantum, and also owns two automotive blogs autocarneed.com and taxiwiz.com.