Shop Kenworth T600 Fuel Tank Caps

Need a new fuel tank cap for your Kenworth T600? We've got a variety of locking, non-locking, vented, and non-vented options. Shop our collection online now!

Kenworth T600 Fuel Tank Caps

Protecting your fuel is just as important as how much you carry. This lineup of fuel tank caps for the Kenworth T600 gives you solid options to keep your fuel system secure, sealed, and running right. Whether you 're after a basic non-locking cap, a vented model for proper airflow, or a tamper-resistant locking cap to guard against theft and siphoning there 's a cap here that fits your needs. These caps are built from tough materials like aluminum and brass, so they hold up to the elements, vibration, and daily wear. A good cap does more than just close the tank it helps prevent leaks, keeps contaminants out, and ensures your fuel stays where it belongs. That means better efficiency, less waste, and more peace of mind when you're parked overnight or fueling up at a busy stop. If you're replacing a worn-out cap or upgrading for extra security, these fuel tank caps are a simple fix with big benefits. Lock it down, seal it tight, and keep your Kenworth T600 ready for the next run.

Frequently Asked Questions About Kenworth T600 Fuel Tank Caps

Will these fuel tank caps fit my specific year Kenworth T600?

Our fuel tank caps are designed to fit Kenworth T600 models from 1985 through 2007. However, there are two main tank neck sizes: 2-inch and 4-inch diameter openings. Before ordering, measure your existing cap or tank opening to ensure proper fitment. Most T600s manufactured after 1995 use the 4-inch caps, while earlier models typically use 2-inch caps. If you're unsure, contact us with your VIN and we'll help identify the correct size.

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

Vented caps allow air to enter the tank as fuel is consumed, preventing vacuum buildup that can restrict fuel flow. Non-vented caps create a complete seal. Most Kenworth T600s require vented caps for proper operation, especially models with single tank setups. Using the wrong type can cause engine performance issues, fuel pump strain, or tank deformation. Check your owner's manual or existing cap for "vented" markings, or look for small vent holes near the cap's seal.

Are locking fuel caps worth the extra cost for my T600?

Locking fuel caps provide essential theft prevention, especially for owner-operators and fleet vehicles parked in unsecured areas. With diesel prices fluctuating, a quality locking cap typically pays for itself by preventing just one theft incident. Our locking caps feature durable brass tumblers and come with two keys. They maintain the same venting properties as standard caps while adding security. Many drivers report them as a worthwhile investment for peace of mind during overnight stops.

How do I know if my fuel cap seal needs replacement?

A failing fuel cap seal typically shows these signs: strong fuel odor around the tank area, visible fuel staining below the cap, difficulty maintaining tank pressure, or check engine lights related to EVAP system codes. For T600s, we recommend replacing caps every 3-5 years or when the rubber seal shows cracking, compression set, or hardening. A proper seal prevents fuel contamination, reduces emissions, and maintains optimal fuel system pressure.

Can I use aftermarket chrome or aluminum caps without affecting performance?

Yes, quality aftermarket caps in chrome or aluminum finishes work perfectly on T600s when properly specified. The key is ensuring they match your tank's thread pattern, diameter, and venting requirements. Our chrome and aluminum caps use the same internal components as OEM caps but offer enhanced appearance and corrosion resistance. They're particularly popular for show trucks or drivers wanting to upgrade their truck's appearance without compromising functionality.