Shop Kenworth W990 Fuel Tank Caps

Looking for the perfect fuel tank cap for your Kenworth W990? 4 State Trucks has you covered! Whether you need factory replacement or upgraded aftermarket locking or non-locking, vented, or non-vented gas caps, we've got the styles you're looking for.

Kenworth W990 Fuel Tank Caps

The Kenworth W990 Fuel Tank Caps product lineup includes a variety of replacement fuel caps and anti-siphon kits designed to fit Kenworth semi-trucks. These products help ensure a secure and leak-proof fuel system, which is essential for reliable performance and preventing fuel theft. Key features include: - Vented and non-vented fuel cap options in various sizes (2", 3.5", and 4") to accommodate different tank configurations - Leak-proof designs with rubber gaskets and anti-siphon features to prevent fuel loss and unauthorized access - Chrome, plastic, and brass finishes to complement the truck's appearance - Easy installation with standard thread patterns (11.5 TPI) for a seamless fit - Durable, high-quality construction to withstand the demands of on-road use These fuel tank caps are a critical component for Kenworth owners who want to maintain the integrity and security of their vehicle's fuel system. Whether replacing a worn or damaged cap or upgrading to a more secure option, this product lineup provides the necessary parts and accessories to keep your Kenworth running safely and efficiently.

Frequently Asked Questions About Kenworth W990 Fuel Tank Caps

Will these fuel tank caps fit my specific year model W990?

Our Kenworth W990 fuel tank caps are designed to fit all W990 models from 2018 to present. The W990 uses a standardized fuel tank opening across all model years, so you can be confident in compatibility. However, if your truck has aftermarket fuel tanks, we recommend measuring your tank opening diameter (typically 4 inches for standard Kenworth tanks) to ensure proper fitment.

What's the difference between locking and non-locking fuel caps, and which should I choose?

Locking fuel caps feature a key mechanism that prevents unauthorized access to your fuel tank, offering security against fuel theft and tampering. Non-locking caps provide quick, convenient access for frequent fueling. Most owner-operators and fleet managers prefer locking caps for added security, especially when parking overnight or in unsecured locations. Both types maintain the same seal quality and fuel system pressure requirements.

Are these caps made of aluminum or chrome-plated steel, and which material lasts longer?

We offer both aluminum and chrome-plated steel options. Aluminum caps are lighter weight, naturally corrosion-resistant, and maintain their appearance with minimal maintenance. Chrome-plated steel caps offer a brilliant mirror finish but require regular polishing to prevent pitting and rust, especially in harsh weather conditions. For longevity with less maintenance, aluminum is typically the better choice, while chrome provides the ultimate show-truck appearance when properly maintained.

Do I need any special tools or modifications to install these fuel caps?

No special tools or modifications are required. These fuel caps are direct replacements that install exactly like your factory cap. Simply turn counterclockwise to remove your old cap and install the new one by turning clockwise until you feel resistance, then an additional quarter turn. The entire process takes less than 30 seconds. All necessary gaskets and seals are included to ensure a proper, leak-free fit.

How do I know if my fuel cap needs replacement, and will these caps prevent check engine lights?

Common signs you need a new fuel cap include a persistent fuel smell, visible cracks or damage to the cap or gasket, difficulty tightening, or a check engine light related to EVAP system codes. Our replacement caps meet or exceed OEM specifications for proper fuel system pressure and vapor containment. A properly functioning fuel cap with intact seals will prevent EVAP-related check engine lights and maintain your truck's emissions compliance.