{"product_id":"evil-energy-6an-male-to-5-16-quick-disconnect-fuel-rail-adapter-2-pack-aluminum-1500-psi","title":"EVIL ENERGY 6AN Male to 5\/16\" Quick-Disconnect Fuel Rail Adapter — 2-Pack Aluminum, 1500 PSI","description":"\u003cstrong\u003eEVIL ENERGY 6AN male to 5\/16\" quick-disconnect EFI fuel rail fitting is a durable aluminum adapter pair that converts a 6AN 37° flare thread to a 5\/16\" quick-disconnect female inlet for EFI fuel rails and related systems.\u003c\/strong\u003e\n\n\u003cp\u003eThis kit contains two precision-machined 6061-T6 aluminum adapters designed for high-pressure fuel applications. Each adapter threads into a 6AN (9\/16-18 UNF) port and accepts a 5\/16\" quick-disconnect female fuel line, with a 37° flare sealing surface to help prevent leaks. Rated for up to 1500 psi and a broad temperature range from -40°F to 250°F, these fittings suit common automotive use-cases like fuel rails, LS swaps, return lines and fuel sensors.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these adapters connect to my existing fuel system?\u003c\/h3\u003e\n\u003cp\u003eThe adapters screw into standard 6AN (9\/16-18 UNF) flare ports and receive a 5\/16\" quick-disconnect female line. The 37° flare provides the sealing interface while the internal bore matches 5\/16\" ID lines for smooth flow. Installation is straightforward with appropriate tools and thread seal precautions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThreads: 6AN (9\/16-18 UNF) male\u003c\/li\u003e\n  \u003cli\u003eOutlet: 5\/16\" quick-disconnect female inlet\u003c\/li\u003e\n  \u003cli\u003eSealing: 37° flare angle to reduce leak risk\u003c\/li\u003e\n  \u003cli\u003eIncludes two matching adapters for paired installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre these fittings strong enough for high-pressure EFI systems?\u003c\/h3\u003e\n\u003cp\u003eYes — the fittings are CNC-machined from 6061-T6 aluminum, a material commonly used in automotive fluid fittings for its strength-to-weight ratio. With a working pressure rating of 1500 psi and a wide operating temperature window, they handle typical EFI, return, and sensor-line pressures encountered in performance and street applications.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMaterial: aluminum alloy 6061-T6 for corrosion resistance and durability\u003c\/li\u003e\n  \u003cli\u003eWorking pressure: rated up to 1500 psi\u003c\/li\u003e\n  \u003cli\u003eTemperature range: -40°F to 250°F for varied environments\u003c\/li\u003e\n  \u003cli\u003ePrecision flare sealing reduces chance of fuel seepage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat vehicles and setups commonly use this adapter?\u003c\/h3\u003e\n\u003cp\u003eThese adapters are versatile for many gasoline and EFI configurations where a 6AN port must accept a 5\/16\" quick-disconnect line. Typical applications include aftermarket fuel rails, LS engine swaps, transmission cooler feed\/return lines, and aftermarket fuel sensor installations. They’re also suitable when converting or adapting between hose sizes during custom plumbing work.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFuel rails and aftermarket EFI systems (including LS swaps)\u003c\/li\u003e\n  \u003cli\u003eFuel return lines and sensor plumbing\u003c\/li\u003e\n  \u003cli\u003eTransmission cooler and other fluid lines with compatible fittings\u003c\/li\u003e\n  \u003cli\u003eCustom plumbing projects needing 6AN to 5\/16\" conversion\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I know before installing these adapters?\u003c\/h3\u003e\n\u003cp\u003ePrepare compatible threads, ensure correct torque, and inspect sealing surfaces before use. Use proper thread sealant if required for your application (avoid sealants that can contaminate fuel), and check manufacturer guidance for torque specs on aluminum fittings. Pressure-test the system after installation to confirm leak-free connections.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCheck port threads: 9\/16-18 UNF (6AN standard)\u003c\/li\u003e\n  \u003cli\u003eInspect 37° flare for nicks or debris before assembly\u003c\/li\u003e\n  \u003cli\u003eUse recommended torque and compatible thread sealant if needed\u003c\/li\u003e\n  \u003cli\u003ePerform a pressure\/leak test after installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? These EVIL ENERGY aluminum adapters are aimed at mechanics, tuners, and do-it-yourself automotive enthusiasts who need a reliable 6AN-to-5\/16\" quick-disconnect solution for fuel rails, LS swaps, return lines, and sensor plumbing. They’re ideal for anyone seeking lightweight, corrosion-resistant fittings rated for high-pressure EFI systems and short-run custom plumbing tasks.\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: What thread size fits the EVIL ENERGY adapter?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The adapter uses a 6AN male thread, which is 9\/16-18 UNF, and accepts a 5\/16\" quick-disconnect female line.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can these fittings handle EFI system pressure?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. They’re rated to 1500 psi and made from 6061-T6 aluminum for high-pressure EFI use.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"EVIL ENERGY","offers":[{"title":"Default Title","offer_id":48087060414622,"sku":"B0BNN62JQ8","price":29.88,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/evil-energy-front-view-adapter-pair_e76fc4bc-38b0-481e-b469-8dde809e2a84.jpg?v=1785915798","url":"https:\/\/northtrailauto.ca\/products\/evil-energy-6an-male-to-5-16-quick-disconnect-fuel-rail-adapter-2-pack-aluminum-1500-psi","provider":"North Trail Auto","version":"1.0","type":"link"}