Shop Freightliner FL70 - FL80 Fuel Tank Caps

Discover our top-quality selection of Freightliner FL70-FL80 fuel tank caps! Explore durable gas caps made from premium aluminum and stainless steel. Choose from lockable and vented options to find your perfect match. Don't forget to get replacement seals and gaskets for a complete solution.

Freightliner FL70-FL80 Fuel Tank Caps

The Freightliner FL70-FL80 Fuel Tank Caps product lineup offers a wide selection of replacement and upgrade options for the fuel tank caps on these popular semi-truck models. Whether you're looking to prevent leaks, add security, or improve ventilation, you'll find a variety of high-quality fuel caps to choose from. The product lineup features caps in different sizes, materials, and styles to suit your specific needs, including brass, aluminum, and locking options. Maximize your fuel efficiency and protect against potential spills or siphoning with the durable and reliable fuel tank caps in this product lineup. Upgrade your Freightliner with the perfect fuel cap solution to keep your truck running at its best.

Frequently Asked Questions About Freightliner FL70-FL80 Fuel Tank Caps

What years and models are these fuel tank caps compatible with?

These fuel tank caps are designed specifically for Freightliner FL70 and FL80 models manufactured from 1994 through 2007. They fit both aluminum and steel fuel tanks with standard 4-inch openings. If your truck has aftermarket tanks or non-standard filler necks, we recommend measuring your current cap diameter before ordering to ensure proper fitment.

Are these caps vented or non-vented, and which type do I need?

Both vented and non-vented options are available. Vented caps are required for diesel fuel tanks to prevent vacuum buildup and allow proper fuel flow. Most FL70 and FL80 models use vented caps as the primary cap and may use a non-vented cap on the secondary tank. Check your original equipment specifications or look for vent holes in your current cap to determine which type you need.

What's the difference between locking and non-locking caps, and are the locks durable?

Locking caps feature a built-in cylinder lock mechanism to prevent fuel theft and tampering. The locks are made from corrosion-resistant materials and typically come with two keys. Non-locking caps use a standard quarter-turn design. While locking caps add security, they require regular lubrication with graphite spray to prevent sticking, especially in harsh weather conditions.

Will these caps seal properly to prevent fuel leaks and vapor emissions?

Quality fuel tank caps feature heavy-duty rubber O-ring seals designed to meet or exceed OEM specifications for vapor containment and leak prevention. Look for caps that are EPA and CARB compliant for emissions standards. Replace the cap if you notice fuel odors, visible leaks around the filler neck, or if your check engine light indicates an EVAP system issue.

How difficult is installation, and what should I watch out for?

Installation is straightforward and requires no tools - simply remove the old cap by turning counterclockwise and install the new cap with a firm clockwise quarter-turn until it clicks. Common issues include cross-threading (avoided by starting slowly and ensuring proper alignment) and over-tightening (stop when you feel resistance and hear the click). Clean the filler neck threads before installation to ensure a proper seal.