Best Fuel System Fittings of 2026

The EVIL ENERGY AN6 Adapter is a versatile fitting designed to connect AN6 flare lines to 1/4" NPT pipes. Made from durable 6061-T6 aluminum alloy with a sleek black anodized finish, it offers strength and corrosion resistance for long-lasting use. The AN6 side features a 37-degree flare seal, ensuring a tight, leak-resistant connection, while the NPT side uses tapered threads sealed at 60 degrees to prevent leaks when properly sealed with tape or sealant. This adapter is ideal for various systems like fuel, cooling, and power steering, making installation and maintenance easier for you with its straightforward wrench-friendly design.

The EVIL ENERGY 6AN Adapter is designed to connect a 6AN male flare fitting to a 3/8 inch hardline, making it easy for you to join different fuel system components. Its size is carefully crafted, with a 9/16 UNF thread on the 6AN side, so you should measure your hardline to ensure a perfect fit. Made from durable aluminum alloy with a brass ferrule, this adapter offers strength and reliability for your fuel delivery or engine modification needs. The sealing is secured by a 37-degree flare angle, which helps prevent leaks and keeps your system running smoothly. This adapter is ideal if you work with stainless steel or aluminum hardlines.

The EVIL ENERGY 6AN Fuel Adapter is designed with a 9/16-18 UNF thread size, making it easy for you to connect fuel lines securely. Its 37-degree flare seal helps ensure a tight, leak-free connection, which is important for maintaining fuel system safety. Made from durable aluminum alloy 6061-T6, this adapter offers strength and resistance to corrosion, so you can rely on it for long-lasting performance. It also handles high pressures up to 1,500 PSI and works in temperatures ranging from -40°F to 250°F, providing you with a reliable solution for various fuel system needs.

The EVIL ENERGY 6AN Adapter is designed to provide reliable connections in your fuel or cooler systems. With a precise 6AN thread size of 9/16 x 18 UNF, it ensures a secure fit that prevents leaks. The adapter can handle pressures up to 1500 PSI, giving you confidence in high-pressure environments. It also performs well in a wide temperature range from -40℉ to 250℉, making it suitable for various climates and conditions. Made from durable aluminum alloy 6061-T6 and featuring a black anodized finish, this adapter offers both strength and corrosion resistance for long-lasting use.

The EVIL ENERGY Quick-Disconnect Fitting is designed for optimal performance in your fuel system. Its 6AN thread size ensures a secure connection with a 3/8 inch and 5/16 inch inner diameter, making it versatile for various applications. The fitting features a 37-degree seal to prevent leaks, providing peace of mind while you drive. With a working pressure of 1500 psi and a wide temperature range from -40°F to 250°F, you can rely on it in extreme conditions. Made from durable aluminum alloy, this fitting combines strength with lightweight convenience, perfect for engine fuel rails and more.

Upgrade your engine fuel rail with the EVIL ENERGY Fuel Rail Fitting. This high-quality fitting is made of durable aluminum alloy and features a 6AN thread size, with a 3/8 inch and 5/16 inch spring lock. Thanks to its 37 degree angle seal, you can trust that this fitting will prevent any leakage. With a working pressure of 1500psi and a temperature range of -40°F to 176°F, this fitting is built to withstand tough conditions. Whether you're performing an LS swap or working on your transmission cooler, this fitting is versatile and can be used in various applications. Trust EVIL ENERGY for all your fuel system fitting needs.

The EVIL ENERGY 8AN Flare Cap is designed with a 3/4-16 UNF thread size, making it easy for you to fit securely onto compatible fuel lines. Its 37-degree angled seal ensures a tight, leak-free connection, keeping your system safe from fuel leaks. Made from durable 6061-T6 aluminum alloy with an anodized black finish, this cap offers long-lasting corrosion resistance and a sleek look. It can handle pressures up to 1500 PSI and works reliably in temperatures ranging from -65º F to 252º F, so you can trust it to perform well in various conditions.

The EVIL ENERGY 6AN Swivel Adapter is a versatile fitting designed to connect two female AN6 threads with a 9/16-18 UNF size. It can handle pressures up to 1,500 PSI, making it reliable for demanding fuel system applications. The adapter works well in a wide temperature range from -40℉ to 250℉, so you can trust it in harsh environments. Made from durable 6061-T6 aluminum alloy with a sleek black anodized finish, this fitting resists wear and corrosion. Its 360-degree swivel design lets you easily assemble and adjust connections without hassle, giving you flexibility and convenience during installation.

The EVIL ENERGY Pressure Adapter is designed to enhance your fuel system by allowing you to easily add a fuel pressure gauge or sensor. It features a male AN6 to female -6 connection with a 1/8" NPT gauge port, ensuring compatibility with various setups. The sealing mechanism utilizes a 37-degree angle for the AN flare and a tapered design for the NPT, providing a reliable and leak-free connection. Made from durable 6061-T6 aluminum alloy, this adapter can withstand a maximum working pressure of 1500 PSI and temperatures ranging from -40°F to 250°F, making it suitable for a wide range of applications.

The EVIL ENERGY 6AN Swivel Adapter offers a reliable and easy-to-use solution for your fuel system needs. Its 6AN thread size of 9/16-18 UNF ensures compatibility with a variety of fittings, making installation straightforward. Designed to handle pressures up to 1,500 PSI, this adapter is built for durability and safety under demanding conditions. You’ll appreciate its wide temperature tolerance, working effectively between -40°F and 250°F, so it performs well in both hot and cold environments. Made from strong aluminum alloy 6061-T6 with a black anodized finish, it resists corrosion and wear, giving you long-lasting performance. The 37-degree flare seal ensures a tight and secure connection, preventing leaks.