{"product_id":"gm-genuine-parts-locking-fuel-tank-cap-gt139l-25060147-oem-threaded-replacement-rubber-gasket-optional-check-valve","title":"GM GENUINE PARTS locking fuel tank cap GT139L (25060147) — OEM threaded replacement, rubber gasket \u0026 optional check valve","description":"\u003cstrong\u003eGM Genuine Parts GT139L (25060147) is an OEM locking fuel tank cap that seals the filler neck and adds theft deterrence while matching factory fit and function.\u003c\/strong\u003e\n\n\u003cp\u003eThis locking fuel cap is an original-equipment replacement made to GM specifications for vehicles that require a threaded locking cap. It combines a rubber gasket for a liquid-tight seal with an optional pressure check valve to equalize tank air pressure. Built to the same dimensional and material standards as the factory part, the GT139L restores proper sealing, prevents contaminants from entering the tank, and limits unauthorized fuel access.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the GT139L maintain a secure seal?\u003c\/h3\u003e\n\u003cp\u003eThe cap uses a molded rubber gasket and precision threads to create a reliable, liquid-tight barrier between the fuel tank and the environment. Proper sealing helps prevent fuel loss, keeps moisture and dirt out of the filler neck, and preserves onboard vapor control systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRubber gasket forms a tight contact with the filler neck sealing surface.\u003c\/li\u003e\n  \u003cli\u003eThreaded design matches factory engagement depth and torque.\u003c\/li\u003e\n  \u003cli\u003eDurable materials resist fuel and weather exposure over time.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDoes this cap include a pressure or check valve?\u003c\/h3\u003e\n\u003cp\u003eSome GT139L caps include an internal check valve that responds to differential pressure inside the tank. The valve allows air movement to equalize pressure as needed while retaining a sealed barrier against liquid fuel and contaminants.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCheck-valve operation admits or vents air depending on tank pressure.\u003c\/li\u003e\n  \u003cli\u003eHelps maintain proper evaporative system performance when applicable.\u003c\/li\u003e\n  \u003cli\u003eValve design is integrated without compromising the locking mechanism.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat security benefits does the locking feature provide?\u003c\/h3\u003e\n\u003cp\u003eThe integrated lock deters fuel theft and unauthorized access at the filler. It’s a simple mechanical way to protect fuel and peace of mind, particularly for vehicles parked in public or unattended locations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eKeyed lock secures the cap to the filler neck to prevent removal.\u003c\/li\u003e\n  \u003cli\u003eSame key options and replacement keys available through GM dealers.\u003c\/li\u003e\n  \u003cli\u003eLock housing and shank built to resist tampering and corrosion.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this cap fit my GM vehicle and how do I install it?\u003c\/h3\u003e\n\u003cp\u003eGT139L is a vehicle-specific part designed to match the original equipment cap on qualifying GM models. Installation is straightforward: thread the cap onto the filler neck until the gasket seats, then lock if applicable. Always verify part number compatibility with your VIN or vehicle year\/model before purchase.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect-fit replacement for the corresponding GM part number 25060147.\u003c\/li\u003e\n  \u003cli\u003eNo special tools required for standard installation—hand-tighten per factory guidance.\u003c\/li\u003e\n  \u003cli\u003eConfirm fit by cross-referencing GM part listings or dealer lookup.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The GM Genuine Parts GT139L locking fuel cap is intended for owners and technicians who need a factory-equivalent replacement for a GM vehicle that originally used a threaded locking fuel cap. It suits drivers who want to restore proper sealing and evaporative function, reduce the risk of fuel theft, or replace a worn or damaged cap with a GM-specified component. Ideal for maintenance shops, fleet managers, and vehicle owners seeking OEM fit, reliable sealing performance, and a built-in locking option.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is GT139L (25060147) a direct replacement for my GM car?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—GT139L is an OEM part intended as a direct replacement. Confirm compatibility using your vehicle year, model, and VIN or GM part lookup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I install this locking fuel cap myself?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Thread the cap until the gasket seats and engage the lock if present. No special tools are typically required.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GM GENUINE PARTS","offers":[{"title":"Default Title","offer_id":48086759964830,"sku":"B000C9STDY","price":52.67,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/gm-genuine-parts-gt139l-front-view.jpg?v=1785903832","url":"https:\/\/northtrailauto.ca\/products\/gm-genuine-parts-locking-fuel-tank-cap-gt139l-25060147-oem-threaded-replacement-rubber-gasket-optional-check-valve","provider":"North Trail Auto","version":"1.0","type":"link"}