{"product_id":"lnkvorx-fuel-rail-cap-set-5-pack-m12-m14-m16-m18-m20mm-carbon-steel-injector-block-off-kit","title":"Lnkvorx Fuel Rail Cap Set 5-Pack (M12\/M14\/M16\/M18\/M20mm) Carbon-Steel Injector Block-Off Kit","description":"\u003cp\u003e\u003cstrong\u003eLnkvorx 5-pack fuel rail cap set is a carbon-steel injector block-off kit with five thread sizes (12, 14, 16, 18, 20mm) to seal diesel common rails and isolate injectors for diagnostics and maintenance.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis kit provides a compact, durable way to temporarily cap fuel rail outlets on many diesel engines so you can test return flow, locate leaking injectors, or prevent fuel loss during service. Each cap is internally threaded with a 1.5 thread pitch and sized to match common fuel line nuts used on popular diesel platforms. The set is designed for repeated shop use and works with a range of Ford, Cummins and Duramax engines as well as other vehicles with matching thread dimensions.\u003c\/p\u003e\n\n\u003ch3\u003eWhich engines and models will these caps fit?\u003c\/h3\u003e\n\u003cp\u003eThese caps cover a broad set of diesel engines by matching nut diameters and thread pitch rather than vehicle brand alone. They suit several Ford Power Stroke, Cummins, and Duramax applications and will fit any vehicle with the same metric thread sizes.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e12mm (M12 x1.5) — fits Ford 6.4L (2008–2010).\u003c\/li\u003e\n  \u003cli\u003e14mm (M14 x1.5) — fits Ford 6.7L (2011–2022), Cummins 5.9L (2003–2009), Duramax 6.6L (2001–2005, 2017–2022).\u003c\/li\u003e\n  \u003cli\u003e16mm (M16 x1.5) — fits Cummins 6.7L (2019–2022).\u003c\/li\u003e\n  \u003cli\u003e18mm (M18 x1.5) — fits Duramax 6.6L (2011–2016).\u003c\/li\u003e\n  \u003cli\u003e20mm (M20 x1.5) — fits Cummins 6.7L (2007–2018) and Duramax 6.6L (2006–2010).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I use these fuel rail caps for injector diagnostics?\u003c\/h3\u003e\n\u003cp\u003eInstall one cap at a time on the fuel rail after removing the injector supply line to isolate the cylinder under test. With the cap installed, restart or crank the engine briefly and observe fuel pressure or return flow readings; a higher-than-expected pressure or reduced return indicates the injector is sealing differently from the others.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRemove one injector supply line at a time to avoid fuel hazards.\u003c\/li\u003e\n  \u003cli\u003eThread the matching cap onto the rail outlet until snug; hand-tighten, then a light wrench turn if needed.\u003c\/li\u003e\n  \u003cli\u003eMonitor fuel pressure and compare return volume per cylinder to identify anomalies.\u003c\/li\u003e\n  \u003cli\u003eUse multiple caps when testing several injectors simultaneously for clearer results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the caps made of and how durable are they?\u003c\/h3\u003e\n\u003cp\u003eEach cap is machined from carbon steel for strength and repeated shop use. The metal construction resists deformation under typical fuel system pressures and offers a longer service life versus softer materials, though routine inspection for thread wear is recommended.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFull carbon-steel body for toughness and durability.\u003c\/li\u003e\n  \u003cli\u003eStandard Mx1.5 internal threads to match common fuel line nuts.\u003c\/li\u003e\n  \u003cli\u003eSuitable for repeated diagnostic cycles and garage environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre there safety or usage tips I should follow?\u003c\/h3\u003e\n\u003cp\u003eWork in a well-ventilated area and relieve rail pressure before disconnecting lines to reduce fuel spray risk. Avoid using the caps as permanent seals — they are diagnostic and service tools, not long-term replacements for proper fittings. Keep a rag and drip pan handy and dispose of fuel safely.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRelieve fuel rail pressure before disconnecting lines.\u003c\/li\u003e\n  \u003cli\u003eWear eye protection and gloves when working with diesel fuel.\u003c\/li\u003e\n  \u003cli\u003eDo not use caps as permanent fittings; always replace with proper lines or plugs for road use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Lnkvorx 5-pack fuel rail cap set is aimed at diesel mechanics, fleet technicians, and experienced DIYers who service Cummins, Ford Power Stroke and Duramax engines or any diesel with matching thread sizes. If you regularly diagnose injector issues, need a reliable workshop diagnostic kit, or want a compact set to troubleshoot fuel return and injector leaks, this kit offers the thread sizes and build quality to make those tasks faster and safer.\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: Can these caps be used as permanent fuel line plugs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. They are designed for diagnostic and temporary service use, not long-term sealing on operating vehicles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do the caps fit non-listed diesel engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, if the fuel line nut matches the cap's metric size and M1.5 thread pitch they will fit other diesel models.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Lnkvorx","offers":[{"title":"Default Title","offer_id":55167213338967,"sku":"B0DLWW2LQF","price":41.79,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/lnkvorx-front-packaging-fuel-rail-cap-set.jpg?v=1790378632","url":"https:\/\/britishgarage.co.uk\/products\/lnkvorx-fuel-rail-cap-set-5-pack-m12-m14-m16-m18-m20mm-carbon-steel-injector-block-off-kit","provider":"British Garage","version":"1.0","type":"link"}