Fuel Caps for Diesel Fuel Tanks

Cleveland Tank proudly offers a large selection of both non-locking and locking fuel caps for diesel fuel tank applications. Every cap features durable heavy-duty construction and is engineered to resist leaks, cracks and contamination to your fuel system.

Brass Non-Locking
Fuel Cap – 4.00″ Diameter

The FC1005 from Cleveland Tank is a vented brass diesel fuel cap for fuel systems that rely on the cap itself — not a separate equalizer line — to let air into the tank as fuel is drawn down. It has a 4.00-inch diameter and female threads at 8 threads per inch (8 TPI), non-locking, built from brass for extra rigidity and durability over a standard aluminum cap. Fitting a non-vented cap on this type of system risks vacuum lock, so the FC1005 is specced to avoid that while still resisting leaks, cracks, and contamination. At 1.0 lb and 4.0 x 4.0 x 2.0 inches, it’s a direct-fit replacement for diesel fuel systems specifying a 4.00-inch, 8 TPI vented brass cap.
Steel Non-Locking
Diesel Fuel Cap –
2.88″ Diameter

The FC-6NV from Cleveland Tank is a steel diesel fuel cap, built from a heavier, more impact-resistant material than Cleveland Tank’s aluminum or brass caps for applications where maximum toughness matters more than weight or corrosion resistance. It has a 2.88-inch diameter with a male thread design at 8 threads per inch (8 TPI), non-locking and non-vented. The male thread fits a female-threaded tank neck, the opposite of most caps in the lineup, so confirm thread gender before ordering. At 1.0 lb and 2.50 x 2.50 x 2.0 inches, the FC-6NV is a direct-fit replacement for diesel fuel systems specifying a 2.88-inch, male 8 TPI steel cap.
Steel Non-Locking
Diesel Fuel Cap –
2.88″ Diameter

The FC-6V from Cleveland Tank is a vented steel diesel fuel cap for fuel systems that rely on the cap itself — not a separate equalizer line — to let air into the tank as fuel is drawn down. It has a 2.88-inch diameter with a male thread design at 8 threads per inch (8 TPI), non-locking, built from steel for maximum impact resistance where corrosion isn’t the primary concern. Fitting a non-vented cap on this type of system risks vacuum lock, so the FC-6V is specced to avoid that. The male thread fits a female-threaded tank neck, the opposite of most caps in the lineup, so confirm thread gender before ordering. At 1.0 lb and 2.50 x 2.50 x 2.0 inches, it’s a direct-fit replacement for diesel fuel systems specifying a 2.88-inch, male 8 TPI vented steel cap.