{"product_id":"lnkvorx-fuel-rail-cap-set-5-pack-12-14-16-18-20mm-carbon-steel-injector-block-off-caps-for-diesel-diagnostics","title":"Lnkvorx Fuel Rail Cap Set — 5-Pack 12\/14\/16\/18\/20mm Carbon Steel Injector Block-Off Caps for Diesel Diagnostics","description":"\u003cp\u003e\u003cstrong\u003eLnkvorx 5 Pack 10810 Fuel Rail Cap Set is a steel injector rail block-off kit with five common sizes (12, 14, 16, 18, 20mm) to seal diesel fuel lines for testing and maintenance.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBuilt from full carbon steel and supplied in five metric thread sizes, this Lnkvorx kit gives diesel techs and DIY mechanics the adapters needed to cap common-rail injector lines, isolate cylinders, and diagnose fuel-return or injector issues without resorting to improvised plugs. The set ships with M12x1.5, M14x1.5, M16x1.5, M18x1.5 and M20x1.5 fittings so it covers many Ford, Cummins and Duramax applications and other engines using these thread standards.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles and engines will these caps fit?\u003c\/h3\u003e\n\u003cp\u003eThese block-off caps match common injector line nut thread sizes used across multiple diesel models. They are not limited to one make; check thread size for confirmation.\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), Duramax 6.6L (2006–2010).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do these caps help diagnose injector or fuel-return problems?\u003c\/h3\u003e\n\u003cp\u003eBy sealing the fuel rail at a single cylinder, the caps let you observe pressure changes and fuel return behavior one cylinder at a time. That isolation helps pinpoint high or low return flow, internal injector leaks, or cylinders that change engine behavior when blocked.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstall one cap at a time on the disconnected injector line and restart to observe fuel pressure and engine response.\u003c\/li\u003e\n  \u003cli\u003eAn increased rail pressure or altered running indicates the capped cylinder was returning excessive fuel or leaking internally.\u003c\/li\u003e\n  \u003cli\u003eRepeat across cylinders to compare readings and identify inconsistent injectors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the materials and build features I should expect?\u003c\/h3\u003e\n\u003cp\u003eThese Lnkvorx caps are machined from full carbon steel for strength and repeatable sealing under diesel pressures. Thread specifications follow a 1.5mm pitch across sizes so they match the common injector line nut threads they’re intended to replace.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFull carbon steel construction for durability and repeated workshop use.\u003c\/li\u003e\n  \u003cli\u003eInternal threads sized precisely to M12\/M14\/M16\/M18\/M20 with 1.5mm pitch.\u003c\/li\u003e\n  \u003cli\u003eDesigned as block-off caps (not pressure regulators) for testing and sealing during diagnostics.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre these caps easy to use for a home mechanic?\u003c\/h3\u003e\n\u003cp\u003eYes — the workflow is straightforward: remove an injector line one cylinder at a time, install the matching cap, then observe changes. The instructions are simple and the set’s range of sizes means you usually won’t need improvised fittings.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOne-cylinder-at-a-time method reduces misdiagnosis from combined returns.\u003c\/li\u003e\n  \u003cli\u003eWorks with standard hand tools used to remove injector line nuts.\u003c\/li\u003e\n  \u003cli\u003eMultiple caps let you test multiple cylinders without delay when diagnosing intermittent problems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Lnkvorx 5 Pack 10810 Fuel Rail Cap Set is aimed at diesel mechanics, service shops, mobile technicians, and experienced DIYers who work on Ford, Cummins, Duramax or other diesel engines using M12–M20 injector line threads. It’s intended for diagnostic isolation and temporary sealing during troubleshooting and should be used with appropriate safety practices and fuel-system knowledge.\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 I use these caps on non-listed diesel engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes if the injector line nut thread matches M12\/M14\/M16\/M18\/M20 with 1.5mm pitch. Always confirm thread size before use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these caps permanent fittings?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. They are block-off caps for diagnostic or temporary sealing use and not meant as permanent fuel system repairs.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Lnkvorx","offers":[{"title":"Default Title","offer_id":48085711028382,"sku":"B0DLWW2LQF","price":43.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/lnkvorx-5-pack-front-layout.jpg?v=1785876949","url":"https:\/\/northtrailauto.ca\/products\/lnkvorx-fuel-rail-cap-set-5-pack-12-14-16-18-20mm-carbon-steel-injector-block-off-caps-for-diesel-diagnostics","provider":"North Trail Auto","version":"1.0","type":"link"}