Frequently Asked Questions About International S2100-S2300 Fuel Tank Caps

Will these fuel tank caps fit my specific International S2100 or S2300 model year?

These fuel tank caps are designed to fit International S2100 and S2300 models from 1989 through 2010. However, International used two different tank neck sizes during this period - 2.25" and 2.5" diameter openings. Before ordering, measure your tank opening or check your existing cap for size markings. Most 1989-1999 models use the 2.25" size, while 2000-2010 models typically use the 2.5" size, though exceptions exist based on tank manufacturer.

Are these caps vented or non-vented, and which type do I need?

Both vented and non-vented options are available. Vented caps are required for trucks without a separate tank vent system and allow air to enter as fuel is consumed, preventing vacuum lock. Non-vented caps are used when your truck has a dedicated tank vent line. Check your tank for a separate vent tube near the filler neck - if present, use a non-vented cap. If no separate vent exists, you need a vented cap. Using the wrong type can cause fuel delivery problems or tank damage.

What's the difference between locking and non-locking caps, and are the locks durable?

Locking caps feature a key cylinder mechanism to prevent fuel theft and tampering. The locks use either a standard fleet key system or unique keys depending on the model. Based on customer feedback, the lock mechanisms hold up well to daily use for 3-5 years with proper maintenance. Apply a small amount of graphite lubricant to the lock cylinder every 6 months to prevent sticking. Non-locking caps use a simple twist-on design and are ideal if security isn't a concern or if you prefer quicker access.

Are these caps made of plastic or metal, and which material lasts longer?

We offer both aluminum and heavy-duty polymer options. Aluminum caps provide excellent durability and resist fuel vapors indefinitely, typically lasting 10+ years. They're ideal for harsh climates but can corrode if exposed to road salt without regular cleaning. Polymer caps are lighter, won't dent, and resist corrosion but may need replacement every 5-7 years due to UV degradation. Both materials feature fuel-resistant gaskets that should be inspected annually and replaced every 2-3 years to maintain a proper seal.

Can I install these myself, and what should I watch out for?

Installation is straightforward and takes about 5 minutes with no special tools required. First, clean the tank neck threads thoroughly to remove any dirt or old fuel residue. Check that the rubber gasket is properly seated in the cap's groove and apply a thin layer of fuel-resistant lubricant to the gasket. Thread the cap on by hand, turning clockwise until the gasket makes contact, then tighten an additional 1/4 turn - over-tightening can damage the gasket. For locking caps, test the lock mechanism before installation to ensure smooth operation.