Fuel Systems

Our fuel system products fit Ford F-150, Super Duty F-250 and F-350, Dodge Ram 1500, Ram 2500 and 3500, Chevy Silverado 1500, Silverado 2500HD and 3500HD, GMC Sierra 1500, Sierra 2500HD and 3500HD, Toyota Tacoma, Toyota Tundra, and Nissan Titan. Whether you need a Titan auxiliary fuel tank for your Super Duty, an AirDog fuel air separation system for your Cummins, a FASS drop-in fuel system for your Duramax, or a replacement fuel tank for your Ram 2500 crew cab — we carry the exact tank and fuel system configuration for your truck's year, model, cab size, and bed length.

Auxiliary Fuel Tanks, Diesel Fuel Pumps, High Idle Modules & Fuel Filtration

Our Titan fuel tank lineup includes direct-fit replacement fuel tanks and auxiliary fuel tanks for Super Duty, Ram 2500/3500, Silverado HD, Sierra HD, and Titan XD — with capacities ranging from 40 to 60+ gallons for the best auxiliary fuel tank setup for long-range towing. For diesel fuel system protection, we stock AirDog fuel air separation systems for Cummins 5.9L and 6.7L, FASS drop-in fuel systems for Duramax and Power Stroke, and high-performance fuel pumps that deliver clean, air-free fuel to your injectors under heavy load.

Keep your diesel running clean with diesel fuel filter kits from aFe Power, including ProGuard diesel filter master packs for Ram 6.7L Cummins, Super Duty 6.7L Power Stroke, and GM HD 6.6L Duramax. We also carry high idle control modules from BD Diesel for Super Duty, Ram 2500/3500, and GM HD — essential for cold-weather idling and PTO-driven work equipment.

Our fuel systems collection also includes Edelbrock carburetors, intake manifolds, fuel line kits, and carburetor accessories for classic truck and muscle car builds. For related diesel performance upgrades, browse our Exhaust systems, Air Intake Systems, and Programmers for tuners and monitors. Check your engine vitals with Gauges including EGT, boost, and fuel pressure gauges. All fuel system products are part of our broader Performance collection.

For auxiliary fuel storage tanks and portable fuel containers for your truck bed, check out Commercial. Pair your fuel system upgrade with a lift or leveling kit from Suspension, or add a towing setup from Towing to complete your long-range hauling build.

What's Included in Our Truck Fuel Systems Collection

• Replacement fuel tanks — direct-fit Titan fuel tanks for Super Duty, Ram 2500/3500, Silverado HD, Sierra HD, Titan XD, and Ram 1500 EcoDiesel in crew cab, mega cab, and cab & chassis configurations with 6.5-foot and 8-foot bed options
• Auxiliary fuel tanks — Titan Travel Trekker 40-gallon and 50-gallon auxiliary tanks and auxiliary fuel tank kits for Super Duty cab & chassis and long-range towing builds
• Fuel air separation systems — AirDog and FASS fuel air separation systems for Cummins 5.9L/6.7L, Duramax 6.6L LBZ/LLY/LML/LMM/L5P, and Power Stroke 6.0L/6.4L/6.7L
• Drop-in fuel systems — FASS drop-in fuel pumps for Super Duty, Ram 2500/3500, and GM HD with direct-fit installation and no drilling required
• Diesel fuel filters — aFe ProGuard diesel filter master packs and individual fuel filters for Ram 6.7L Cummins, Super Duty 6.7L Power Stroke, and GM 6.6L Duramax
• High idle control modules — BD Diesel high idle controllers for Super Duty, Ram 2500/3500, and GM HD for cold-weather idling and PTO applications
• High-performance fuel pumps — aftermarket fuel pumps for GM, Ford, and Ram diesel and gas applications
• Carburetors & fuel accessories — Edelbrock carburetors, intake manifolds, fuel line kits, throttle cables, and calibration kits for classic truck and muscle car builds

Why Choose Lethal Auto

Every fuel tank and fuel system product at Lethal Auto is matched to your truck's exact year, make, model, cab configuration, and bed length — with verified fitment and a lowest price guarantee across Canada. Whether you are building the best auxiliary fuel tank setup for long-range towing or upgrading your diesel fuel filter kit on a Ram 2500 6.7 Cummins, our team is available Monday to Friday at 306-717-3959 to help you find the right fit.

Frequently Asked Questions

What is an auxiliary fuel tank and how does it work on a truck?

An auxiliary fuel tank is a secondary fuel tank installed in the truck bed or mounted under the chassis that feeds directly into the factory fuel tank through a gravity-feed or transfer pump system. It extends your driving range significantly — a 50-gallon auxiliary tank on a Super Duty can add over 500 kilometres of range before needing to refuel. Titan Travel Trekker auxiliary tanks are the most popular option for long-distance towing and remote work site applications.

What is the difference between an AirDog and FASS fuel system for diesel trucks?

Both AirDog and FASS systems remove air, water, and contaminants from diesel fuel before it reaches your injection system — but they differ in design. AirDog systems use a two-stage filtration process with a water separator and fuel filter, while FASS drop-in systems replace the factory fuel module entirely for a cleaner installation. AirDog is popular for Cummins-powered trucks, while FASS is widely used on Duramax and Power Stroke applications.

Do diesel trucks need a fuel air separation system?

Diesel injection systems are highly sensitive to air and water contamination in fuel. A fuel air separation system removes dissolved air, water vapour, and particulates that the factory fuel system cannot filter out — reducing injector wear, improving throttle response, and preventing hard starts in cold Canadian winters. Trucks that tow heavy, idle frequently, or use biodiesel blends benefit the most from an aftermarket fuel air separation system.

What is the best way to extend fuel range on a diesel truck for towing?

Installing an auxiliary fuel tank is the most effective way to extend range on a diesel truck used for towing. A Titan auxiliary fuel tank adds 40 to 50 gallons of capacity that feeds directly into your factory tank. Pairing an auxiliary tank with a fuel air separation system like an AirDog or FASS further improves fuel delivery efficiency under heavy towing loads. For towing-specific upgrades, pair your fuel system with a proper hitch setup from our Towing collection.

What does a high idle control module do on a diesel truck?

A high idle control module raises the engine idle speed on a diesel truck to maintain operating temperature and battery charge during extended idling — especially useful in cold Canadian winters when trucks sit running on job sites or during PTO-driven equipment operation. BD Diesel high idle controllers are available for Super Duty 6.7L, Ram 2500/3500 Cummins, and GM HD Duramax, and activate automatically based on engine temperature or manual switch input.

How often should you change the fuel filter on a diesel truck?

Most diesel truck manufacturers recommend changing the fuel filter every 24,000 to 40,000 kilometres, depending on the engine and driving conditions. Trucks that tow frequently, idle for long periods, or operate in dusty environments should change fuel filters closer to the 24,000-kilometre mark. Using an aFe ProGuard diesel filter master pack for your Ram Cummins, Super Duty Power Stroke, or GM Duramax ensures you have matched filters ready for your next service interval.