The FC980 from Cleveland Tank is a vented, locking diesel fuel cap built for fuel systems that rely on the cap itself to relieve tank pressure and admit air as fuel is drawn down — rather than a separate equalizer line. It has a 3.00-inch nominal diameter and female threads at 8 threads per inch (8 TPI), machined from lightweight, corrosion-resistant aluminum for long service life over a standard steel cap. The integrated lock helps deter fuel theft and tampering, while the vented design prevents the vacuum lock that can starve a fuel system of a properly working vent path. At 1.0 lb and 3.0 x 3.0 x 2.0 inches, it’s a direct-fit replacement for diesel fuel tanks specifying a 3.00-inch, 8 TPI female-thread vented cap.

The FC1014 from Cleveland Tank is a brass diesel fuel cap sized at 2.50 inches in diameter, filling the gap between Cleveland Tank’s smaller 2″ and larger 3″/4″ caps. It has a female thread design at 8 threads per inch (8 TPI), non-locking and non-vented, built from brass for extra rigidity and durability over a standard aluminum cap. It resists leaks, cracks, and fuel contamination, and holds up well to repeated fueling cycles and rough handling. At 1.0 lb and 3.0 x 3.0 x 2.0 inches, the FC1014 is a direct-fit replacement for diesel fuel systems specifying a 2.50-inch, 8 TPI female-thread brass cap.