Frequently Asked Questions About International LoneStar Fuel Tank Caps

Will these fuel tank caps fit my specific year International LoneStar?

Our International LoneStar fuel tank caps are designed to fit 2008-2020 LoneStar models. However, International made minor changes to tank configurations over the years. For 2008-2012 models, verify your tank has a standard 4-inch opening. For 2013+ models, most caps are universally compatible, but ProStar-equipped LoneStars may require different threading. Always check your existing cap's part number or contact us with your VIN for exact fitment confirmation.

What's the difference between locking and non-locking fuel caps, and which should I choose?

Locking fuel caps feature a key mechanism that prevents fuel theft and tampering, essential for overnight parking or unsecured lots. Non-locking caps offer quicker access for frequent fueling but provide no security. Most drivers choose locking caps for peace of mind, especially given rising fuel costs. Our locking caps come with 2 keys and use a universal International key pattern, making replacement keys readily available at truck stops.

Are these caps made of plastic or metal, and how long do they typically last?

We offer both aluminum and high-grade polymer options. Aluminum caps resist UV damage and last 5-7 years on average but can corrode in salt-heavy regions. Polymer caps are lighter, won't corrode, and typically last 3-5 years but may fade in extreme sun exposure. Both meet DOT regulations and include quality gaskets that maintain proper tank pressure. Chrome-plated options are available for show trucks but require more maintenance to prevent pitting.

How do I know if my fuel cap is failing and needs replacement?

Common signs include: check engine light with codes P0455 or P0457 (indicating vapor leaks), strong fuel odor around the tank, visible cracks in the cap or gasket, difficulty threading the cap, or excessive play when installed. A failing cap can trigger emissions warnings and reduce fuel economy by 1-2%. Test your cap by checking if it clicks 3-4 times when tightening - fewer clicks often indicate worn threads or gasket compression issues.

Can I install these myself, and are there any special considerations?

Installation takes under 5 minutes and requires no tools. Simply unscrew your old cap counterclockwise and thread the new one clockwise until you hear 3-4 clicks. Important: clean the tank neck threads with a rag first to prevent debris from damaging the new gasket. For dual-tank setups, replace both caps simultaneously to maintain equal tank pressure. Never over-tighten beyond the clicking point, as this can damage the gasket and cause premature failure.