Shop Kenworth T660 Fuel Tank Caps

Check out our diverse selection of Kenworth T660 fuel tank caps at 4 State Trucks! Whether you're looking for a locking fuel cap, anti-siphon fuel cap, or chrome plated fuel cap, we've got you covered. With a focus on quality and durability, our fuel tank caps ensure a perfect fit and reliable performance.

Kenworth T660 Fuel Tank Caps

The Kenworth T660 Fuel Tank Caps product lineup offers a comprehensive selection of durable and stylish fuel tank covers for the popular Kenworth T660 semi-truck. This product lineup features a variety of options, including chrome plastic, polished billet aluminum, and locking fuel caps, providing both functional and aesthetic upgrades for your Kenworth T660. Whether you're looking to enhance the appearance of your truck or ensure secure fuel access, this product lineup has the perfect fuel tank cap solution to meet your needs. Highlights include anti-siphon protection, vented designs, and easy-to-use key lock mechanisms, ensuring your fuel tank is both secure and well-ventilated. Upgrade your Kenworth T660 with the high-quality fuel tank caps found in this product lineup and achieve a customized, professional look for your semi-truck.

Frequently Asked Questions About Kenworth T660 Fuel Tank Caps

Will these fuel tank caps fit my specific year Kenworth T660?

Our fuel tank caps are designed to fit Kenworth T660 models from 2008-2016. The standard tank opening size is 4 inches in diameter with 8 threads per inch. However, some aftermarket tanks may have different specifications. We recommend measuring your current cap or tank opening before ordering. If you're unsure, contact us with your VIN and we'll help verify compatibility.

What's the difference between locking and non-locking fuel caps?

Locking fuel caps feature a built-in lock mechanism that requires a key to open, providing security against fuel theft and tampering. Non-locking caps use a standard twist-on design for quick access. Locking caps typically add about $15-25 to the price but offer peace of mind, especially for drivers who park in unsecured areas. Both types use the same thread pattern and seal equally well when properly installed.

Are these caps made of plastic or metal, and which is better?

We carry both aluminum and heavy-duty polymer caps. Aluminum caps are more durable, resist UV damage better, and typically last 5-7 years. They're ideal for harsh weather conditions but cost more. Polymer caps are lighter, more affordable, and work well for most applications, lasting 3-5 years with proper care. Both materials meet DOT requirements and create proper vapor seals when correctly installed.

How do I know if my fuel cap needs replacing?

Replace your fuel cap if you notice: a strong fuel smell near the tank, the check engine light coming on (often code P0442 or P0456), difficulty removing or installing the cap, visible cracks or damage to the gasket, or if the cap doesn't click when tightening. A faulty cap can cause fuel evaporation, reduced fuel economy, and emissions test failures. Most caps should be replaced every 50,000-100,000 miles as preventive maintenance.

Can I install these myself, or do I need special tools?

Installation is straightforward and requires no special tools. Simply unscrew your old cap counter-clockwise and screw the new one on clockwise until you hear 3-4 clicks. The entire process takes under 5 minutes. Make sure the tank opening and new cap threads are clean before installation. Apply a thin layer of diesel fuel to the gasket for easier installation and better sealing. If your old cap is stuck, use penetrating oil and let it sit for 10 minutes before removal.