Kenworth T700 Fuel Tank Caps

Frequently Asked Questions About Kenworth T700 Fuel Tank Caps

Will this fuel tank cap fit my Kenworth T700 correctly?

Fuel tank caps vary by thread size, locking mechanism, and vent design, so it is important to check your existing cap's specifications or your tank's neck diameter before ordering. If you are unsure, comparing the part number of your original cap to the listing details or reaching out to our sales team can help confirm a proper fit for your specific T700 configuration.

Do I need a locking or non-locking fuel cap?

Many fleets and owner-operators prefer locking fuel caps to help deter fuel theft and tampering, especially for trucks that sit overnight at truck stops or rest areas. Non-locking caps are typically lighter and simpler but offer no theft protection. Consider how and where your truck is parked most often when deciding which style makes sense for you.

What materials are these fuel tank caps made from, and how do they hold up?

Fuel tank caps are commonly available in chrome-plated steel, aluminum, or durable plastic composites. Chrome and aluminum options tend to resist corrosion better and hold up well in wet or salted road conditions, while also matching the look of polished fuel tanks. Plastic caps are often more budget-friendly but may show wear sooner under constant sun and road exposure.

How do I know if my fuel cap needs a vented or non-vented design?

Vented caps allow air to enter the tank as fuel is drawn out, which helps prevent vacuum lock and fuel delivery issues. Most diesel fuel systems on the Kenworth T700 require a vented cap, but it is still worth verifying your original cap's design before replacing it, since installing the wrong type can lead to fuel flow or pressure problems.

Is installation something I can do myself, or should a professional handle it?

Replacing a fuel tank cap is generally a straightforward job that most owner-operators and shop technicians can handle without special tools, since it typically just threads or locks onto the existing fuel neck. If your cap includes a locking mechanism or a tethered strap, double check that it seats and seals properly to avoid fuel vapor leaks or moisture getting into the tank.