Lock in safety, seal in fuel. When you're putting in the miles, the last thing you want is a leaky fuel cap or the risk of theft at a rest stop.

Functional Freightliner Classic Fuel Tank Caps

Our aftermarket fuel tank caps for the Freightliner Classic are built to keep your diesel secure, your aluminum fuel tank sealed tight, and your rig ready for the long haul. Whether you’re after locking, non-locking, or vented caps, we’ve got solid options that fit like a glove and perform under pressure.

Why upgrade?

- Stop potential fuel loss with tight, leak-resistant seals - Protect your tank with locking or non-locking cap options to help deter theft and siphoning - Choose vented options for proper pressure regulation - Built tough from corrosion-resistant aluminum or composite materials - Fast install with direct-fit compatibility—no fuss, no tools needed

Secure Your Fuel System Today

We carry fuel caps from trusted brands like Leak Defender and BESTfit, so you’re getting quality you can count on. Pair your purchase with additional fuel tank accessories stylish, vinyl Classic fuel tank bras and covers. Don’t wait for a bad seal or fuel thief to cost you time and money.