Upgrade your truck’s range, capability, and convenience with the TITAN XXL 40-Gallon Replacement Fuel Tank for the 2018–2021 Ford F-150 Power Stroke Diesel. Designed as a direct-fit replacement for the factory fuel tank, this extra-capacity mid-ship 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, work remote job sites, or simply want fewer fuel stops during daily driving, the TITAN XXL tank delivers the added range and confidence diesel truck owner's demand. Built from TITAN’s legendary military-grade cross-linked polymer and backed by a Lifetime Warranty, this fuel tank upgrade is engineered for maximum durability, long-term reliability, and real-world performance.
Key Features
- 40-Gallon Usable Fuel Capacity – Adds approximately 14 gallons over the factory tank for extended driving range and fewer fuel stops
- Direct-Fit Bolt-In Design – Engineered specifically for Ford F150 Power Stroke models with no cutting or fabrication required
- Military-Grade Polymer Construction – Corrosion-resistant cross-linked polymer material is tougher than steel and built to last
- Maintains Factory Functionality – Compatible with the OEM sending unit while retaining accurate fuel gauge operation
Features & Benefits
The TITAN XXL Replacement Fuel Tank is designed for diesel truck owners who rely on their vehicles for towing, hauling, long-distance travel, and demanding daily use. By increasing fuel capacity from the factory 26 gallons to a full 40 gallons of usable fuel, this system allows drivers to stay on the road longer with fewer interruptions for refueling.
Unlike auxiliary fuel systems that consume valuable bed space, the TITAN XXL replaces the factory mid-ship fuel tank while maintaining your truck’s clean, factory-style appearance and bed usability. This makes it an ideal solution for work trucks, towing applications, overlanding setups, and daily driven diesel pickups.
Constructed from TITAN’s exclusive military-grade cross-linked polymer, this replacement tank is engineered to outperform traditional steel and aluminum tanks in both durability and longevity. With a material thickness of at least ¼-inch, the tank resists corrosion, impacts, cracking, and harsh environmental conditions that can shorten the lifespan of metal tanks.
The seamless molded design eliminates welds entirely, removing one of the most common failure points found in conventional fuel tanks. TITAN’s advanced polymer construction also helps absorb impacts without permanent deformation, providing long-term reliability even under demanding driving conditions.
This tank features TITAN’s exclusive low fuel trap design, ensuring all 40 gallons remain usable capacity. Unlike some oversized fuel tanks that advertise inflated numbers with inaccessible reserve fuel, TITAN prioritizes real-world usability and accurate capacity expectations.
Additional engineering advantages include minimal hang-down below the stock tank location—approximately only 1¾ inches lower than factory—helping preserve ground clearance and off-road capability.
The tank includes black-coated galvanized steel mounting straps for enhanced corrosion resistance and long-term support. It is also compatible with many aftermarket fuel system upgrades including Fleece, AirDog, and FASS systems.
Fuel Gauge & Distance-to-Empty Information
Fuel Gauge Accuracy
Your factory in-dash fuel gauge will continue to operate accurately after installation. Because the TITAN tank holds more fuel than stock, the gauge will simply remain on “Full” longer before beginning to drop.
Distance-to-Empty (DTE) / Range Display
Programming is not required for proper tank operation. However, drivers who want the truck’s Distance-to-Empty display to reflect the increased fuel capacity may update the vehicle computer using compatible programming tools.
Programming Options
- 2011–2026 Ford Trucks: Compatible with the TITAN Tech programmer available directly from TITAN Fuel Tanks
Third-party software and programming tools are independent of TITAN Fuel Tanks.
Installation Information
The TITAN XXL tank is engineered as a direct-fit replacement for the factory fuel tank, making installation straightforward and vehicle-specific.
Vehicle Fitment:
- 2018–2021 Ford F150
- Crew Cab
- 5.5-foot bed
- Power Stroke Diesel models only
Installation Features:
- Direct bolt-in installation
- No cutting, welding, or fabrication required
- Utilizes the factory/OE sending unit
- Minimal hang-down below factory tank location
Additional Compatibility Notes:
- Will not interfere with most powered running boards, air bag systems, or common truck accessories
- Compatible with aftermarket fuel systems such as Fleece, AirDog, and FASS
Fuel Type:
What’s Included
- TITAN XXL 40-Gallon Replacement Fuel Tank
- Black-coated galvanized steel mounting straps
- Installation hardware
- Integrated low fuel trap system
- Installation instructions
Care & Maintenance
The TITAN XXL fuel tank is engineered for low-maintenance durability and long-term reliability.
Recommended Maintenance:
- Periodically inspect mounting hardware and fuel connections
- Clean exterior surfaces using mild soap and water
- Avoid harsh chemicals or abrasive cleaners
- Inspect fuel system components during regular vehicle maintenance intervals
The corrosion-resistant polymer construction helps eliminate concerns about rust or corrosion over time.
Warranty Details
The TITAN XXL Replacement Fuel Tank is backed by a Lifetime Warranty for long-term confidence and peace of mind.
Warranty Coverage Includes:
- Manufacturing defects
- Material defects
- Structural integrity under normal operating conditions
Warranty Exclusions Include:
- Improper installation
- Misuse or abuse
- Damage caused by accidents or modifications
- Use with non-approved fuels
Terms to Know
- Cross-Linked Polymer: A military-grade engineered plastic material designed for exceptional impact resistance, 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 tank design that helps maximize usable fuel capacity by reducing inaccessible fuel.
- OEM Sending Unit Compatibility: Allows the tank to work with the vehicle’s factory fuel level monitoring system.
- Distance-to-Empty (DTE): The vehicle’s estimated driving range display based on current fuel levels and fuel economy.
Whether you’re towing heavy trailers, traveling long distances, or simply looking for greater fuel independence, the TITAN XXL 40-Gallon Replacement Fuel Tank gives your Ford F150 Power Stroke the extended range and reliability serious diesel owners demand. Built tough, engineered for performance, and designed for real-world usability, it’s a premium upgrade that keeps you moving farther with confidence.