Upgrade your RAM diesel truck with the TITAN XXL 50-Gallon Replacement Fuel Tank and experience the freedom of extended range, fewer fuel stops, and increased confidence on every drive. Designed specifically for 2013–2024 RAM 2500 and 3500 Mega Cab Short Bed models equipped with Cummins diesel engines, this extra-capacity mid-ship replacement tank dramatically increases usable fuel capacity while maintaining factory functionality and compatibility with many popular truck accessories.
Whether you tow heavy trailers, travel long distances, haul equipment, or work in remote areas, the TITAN XXL tank gives your truck the fuel range needed to go farther between fill-ups. Constructed from TITAN’s legendary military-grade cross-linked polymer and backed by a Lifetime Warranty, this premium fuel system upgrade delivers unmatched durability, reliability, and long-term performance for serious diesel truck owners.
Key Features
- 50-Gallon Usable Fuel Capacity – Adds approximately 19 gallons over the factory tank for significantly extended driving range
- Military-Grade Cross-Linked Polymer Construction – Tougher than steel and corrosion-resistant for long-lasting durability in harsh environments
- Direct-Fit Bolt-In Installation – Designed specifically for RAM Mega Cab Short Bed Cummins trucks with no cutting or fabrication required
- Maintains Factory Fuel System Functionality – Retains accurate fuel gauge operation while remaining compatible with many aftermarket fuel systems
Features & Benefits
The TITAN XXL Replacement Fuel Tank is engineered for RAM diesel truck owners who demand more capability from their vehicle. By increasing usable fuel capacity from the factory 31-gallon tank to a full 50 gallons, this system helps reduce fuel stops and improves convenience during towing, road trips, overlanding, and demanding work applications.
Unlike auxiliary fuel systems that occupy valuable bed space, the TITAN XXL replaces the factory mid-ship tank while maintaining full truck bed usability. Its direct-fit design integrates seamlessly into the factory mounting location, preserving the clean factory appearance and minimizing interference with most aftermarket accessories.
Constructed from TITAN’s exclusive military-grade cross-linked polyethylene (XLHDPE), this tank is engineered to outperform conventional steel and aluminum tanks in both strength and longevity. The extra-heavy-duty polymer construction is at least ¼-inch thick and highly resistant to impacts, corrosion, cracking, and environmental wear. TITAN validates the durability of its tanks through rigorous computer simulations and real-world impact testing, including fully loaded drop tests from extreme heights.
Because the tank is molded rather than welded, there are no seams or weld points that can crack or fail over time. The polymer material also offers flexibility under impact, allowing the tank to absorb contact and return to shape without permanent deformation.
The integrated low fuel trap design ensures all 50 gallons remain usable fuel capacity rather than advertising inflated reserve numbers that cannot be accessed during normal driving. Additionally, the tank maintains excellent ground clearance with only approximately 2.5 inches of additional hang-down below the factory tank location.
Internal baffling helps reduce fuel sloshing during acceleration, braking, cornering, and uneven terrain, improving driving stability and fuel pickup consistency. The included, black-coated galvanized steel mounting strap and front support system further enhance durability and long-term corrosion resistance.
The TITAN XXL tank is also compatible with many aftermarket fuel system upgrades including Fleece, AirDog, and FASS systems, making it an excellent solution for performance, towing, and heavy-duty diesel applications.
Fuel Gauge & Distance-to-Empty Information
Fuel Gauge Accuracy
Your factory in-dash fuel gauge will continue functioning accurately after installation. Because the TITAN tank holds more fuel than stock, the gauge will simply remain on “Full” longer before beginning to decrease.
Distance-to-Empty (DTE) / Range Display
Programming is not required for proper tank operation. However, owners who want the truck’s Distance-to-Empty display to reflect the increased fuel capacity can update the vehicle computer using compatible programming tools.
Programming Options
- 2019–2024 RAM Trucks: Compatible with AlfaOBD software for DTE updates
Third-party programming tools and software are independent of TITAN Fuel Tanks.
Installation Information
The TITAN XXL 50-Gallon Tank is engineered as a direct-fit replacement for the factory fuel tank, allowing installation without cutting, drilling, or fabrication. According to the installation instructions, the system is specifically designed for 2013–2024 RAM 2500 and 3500 Mega Cab Short Bed diesel trucks with pickup beds.
Vehicle Fitment:
- 2013–2024 RAM 2500 & 3500
- Mega Cab
- Short Bed (6.5 ft.)
- Cummins Diesel models
- Fits both standard and dual rear wheel models
Installation Features:
- Direct bolt-in replacement design
- No drilling or cutting required
- Utilizes the factory/OE sending unit
- Includes front support assembly and mounting hardware
- Minimal additional hang-down below stock tank location
Required Tools Include:
- Ratcheting socket driver
- Multiple SAE and metric sockets/wrenches
- Torque wrench
- Screwdriver and pliers
- Mallet or small hammer
The installation manual also recommends optional tools such as a hydraulic transmission jack, impact wrench, and vehicle lift to simplify the process.
Additional Installation Notes:
- Some vehicles may require removal of the left rear fender liner or wheel to access fill and vent hoses during installation.
- Internal tank baffling and vent systems are pre-configured for proper fuel management.
- Installation concludes with filling the tank completely and inspecting for leaks.
Compatibility Notes:
- Compatible with most powered running boards, air bag systems, and common accessories
- Not compatible with trucks factory-equipped with the optional 48/50-gallon OEM RAM tank
Diesel fuel only
What’s Included
- TITAN XXL 50-Gallon cross-linked polymer fuel tank
- TITAN Torque Ring hold-down ring
- Full-function tank vents
- Fuel vent hoses
- Hose barb elbow fitting
- RAM Mega Cab Short Bed strap set
- Front support assembly
- Rubber strap bushings
- Black-coated galvanized mounting hardware
Care & Maintenance
The TITAN XXL fuel tank is engineered for low-maintenance durability and long-term reliability.
Recommended Maintenance:
- Periodically inspect fuel lines, clamps, and mounting hardware
- Clean exterior surfaces using mild soap and water
- Avoid harsh chemicals or abrasive cleaners
- Check mounting hardware during routine maintenance intervals
- Inspect vent hoses and fittings periodically for proper operation
The corrosion-resistant polymer construction eliminates concerns about rust or corrosion over time.
Warranty Details
The TITAN XXL Replacement Fuel Tank is backed by a Lifetime Warranty for long-term peace of mind.
Warranty Coverage Includes:
- Manufacturing defects
- Material defects
- Structural integrity under normal operating conditions
Warranty Exclusions Include:
- Improper installation
- Misuse, abuse, or modifications
- Damage caused by accidents
- Use with non-approved fuels
According to the installation documentation, warranty registration must be completed within 60 days of receipt for warranty coverage to remain valid.
Terms to Know
- Cross-Linked Polyethylene (XLHDPE): A military-grade engineered polymer material known for exceptional strength, flexibility, and corrosion resistance.
- Direct-Fit Replacement Tank: A fuel tank designed to replace the factory tank without requiring modifications or fabrication.
- Low Fuel Trap Design: An internal engineering feature that maximizes usable fuel capacity.
- Internal Baffling: Internal tank dividers that help reduce fuel movement and sloshing during driving.
- OEM Sending Unit Compatibility: Allows the replacement tank to work with the truck’s factory fuel gauge and fuel monitoring system.
Whether you tow heavy equipment, travel cross-country, or simply want greater fuel independence from your Cummins-powered RAM truck, the TITAN XXL 50-Gallon Replacement Fuel Tank delivers the extended range, rugged durability, and premium engineering serious diesel owners demand. Built tough and designed for real-world use, it’s a long-term upgrade that helps keep your truck moving farther with confidence.