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.Â
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Aluminum Locking
Diesel Fuel Cap –
3.00″ DiameterAluminum Locking Diesel Fuel Cap, 3.00 Inch Diameter (Part Number FC022-69) by Cleveland Tank. Heavy-duty locking fuel cap machined from lightweight, corrosion-resistant aluminum to resist leaks, cracks, and fuel contamination. Features a 3.00-inch nominal diameter with female threads at 8 threads per inch (8 TPI), a non-vented design, and a built-in locking mechanism to help deter fuel theft and tampering. Weighs 1.0 lb with overall dimensions of 3.0 x 3.0 x 2.0 inches. Designed as a direct-fit replacement diesel fuel tank cap for fuel systems requiring a 3.00-inch female-thread, 8 TPI fitting. Suited for fleet, vocational, and commercial truck fuel tank applications where a secure, weather-tight, anti-corrosion locking fuel cap is needed.
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Aluminum Locking
Diesel Fuel Cap –
3.00″ DiameterAluminum Locking Diesel Fuel Cap, 3.00 Inch Diameter (Part Number FC0183-6) by Cleveland Tank. Heavy-duty locking fuel cap machined from lightweight, corrosion-resistant aluminum to resist leaks, cracks, and fuel contamination. Features a 3.00-inch nominal diameter with female threads at 8 threads per inch (8 TPI), a non-vented design, and a built-in locking mechanism to help deter fuel theft and tampering. Weighs 1.0 lb with overall dimensions of 3.0 x 3.0 x 2.0 inches. Designed as a direct-fit replacement diesel fuel tank cap for fuel systems requiring a 3.00-inch female-thread, 8 TPI fitting. Suited for fleet, vocational, and commercial truck fuel tank applications where a secure, weather-tight, anti-corrosion locking fuel cap is needed.
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Aluminum Locking
Diesel Fuel Cap –
3.00″ DiameterThe 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.
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Aluminum Locking
Diesel Fuel Cap –
4.00″ DiameterThe FC01404 from Cleveland Tank is a 4.00-inch locking diesel fuel cap for fuel systems that need a larger-diameter cap than the standard 3.00-inch size. Machined from lightweight, corrosion-resistant aluminum, it has female threads at 8 threads per inch (8 TPI) and a non-vented, locking design that ships with two keys included. The lock deters fuel theft and tampering, while the aluminum body resists the rust and pitting that shorten the life of a steel cap. At 1.0 lb and 4.0 x 4.0 x 2.0 inches, the FC01404 is a direct-fit replacement for diesel fuel tanks and fuel systems specifying a 4.00-inch, 8 TPI female-thread fitting.
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Aluminum Non-Locking
Diesel Fuel Cap –
2.00″ DiameterThe FC01683 from Cleveland Tank is a 2.00-inch diesel fuel cap sized for smaller fuel system openings than Cleveland Tank’s standard 3- and 4-inch caps. It has a female thread design at 11.25 threads per inch (11.25 TPI) — a finer pitch than the 8 TPI spec used on the larger caps in the line — so getting the thread count right matters for a proper seal. Machined from lightweight, corrosion-resistant aluminum, it resists the rust and pitting that shorten the life of a steel cap. This is a non-locking, non-vented cap, built for diesel fuel systems that don’t require a keyed lock. At 1.0 lb and 2.0 x 2.0 x 2.0 inches, the FC01683 is a direct-fit replacement for diesel fuel tanks specifying a 2.00-inch, 11.25 TPI female-thread cap.
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Aluminum Non-Locking
Diesel Fuel Cap –
2.125″ DiameterThe FC01015 from Cleveland Tank is a 2.125-inch diesel fuel cap built for fuel systems that don’t call for a locking closure. It has a female thread design at 8 threads per inch (8 TPI), matching the thread pitch used across Cleveland Tank’s larger locking caps, so it’s easy to spec correctly even though the diameter is smaller. Machined from lightweight, corrosion-resistant aluminum, it resists the rust and pitting that shorten the life of a steel cap. Non-locking and non-vented, the FC01015 is a straightforward, direct-fit replacement for diesel fuel tanks specifying a 2.125-inch, 8 TPI female-thread cap. It weighs 1.0 lb.
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Aluminum Non-Locking
Diesel Fuel Cap –
3.00″ DiameterThe FC1086 from Cleveland Tank is a 3.00-inch diesel fuel cap for fuel systems that don’t require a locking closure. It shares the same 3.00-inch diameter and 8 TPI female thread as Cleveland Tank’s locking caps in this size, so fitment is identical — it’s simply the non-locking option. Machined from lightweight, corrosion-resistant aluminum, it resists the rust and pitting that shorten the life of a steel cap. Non-vented as well, the FC1086 is a straightforward, direct-fit replacement for diesel fuel tanks specifying a 3.00-inch, 8 TPI female-thread cap. It weighs 1.0 lb.
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Aluminum Non-Locking
Diesel Fuel Cap –
3.00″ DiameterThe FC1349AD from Cleveland Tank is a 3.00-inch diesel fuel cap machined from lightweight, corrosion-resistant aluminum, built to resist leaks, cracks, and contamination over years of service. It has a female thread design at 8 threads per inch (8 TPI), non-locking and non-vented, for diesel fuel systems specifying a standard 3.00-inch, 8 TPI female-thread cap. Weighing 1.0 lb at 3.0 x 3.0 x 2.0 inches, it installs as a direct-fit replacement without any modification to the tank opening — a simple, no-hardware swap for a cracked, corroded, or missing OE cap.
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Aluminum Non-Locking
Diesel Fuel Cap –
4.00″ DiameterThe FC01015VNT from Cleveland Tank is a vented, non-locking diesel fuel cap built 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), machined from lightweight, corrosion-resistant aluminum. Fitting a non-vented cap on this type of system risks vacuum lock, so the FC01015VNT is specced to avoid that while keeping the tank sealed against leaks and contamination. It weighs 1.0 lb at 4.0 x 4.0 x 2.0 inches and installs as a direct-fit replacement for diesel fuel tanks specifying a 4.00-inch, 8 TPI vented cap.
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