EVIL ENERGY 6AN Male to 3/8" & 5/16" Quick-Disconnect Fuel Fitting — Dual Outlet Aluminum, 1500 psi

EVIL ENERGY 6AN male to 3/8" & 5/16" quick-disconnect fuel fitting is a dual-size aluminum adapter that converts a 6AN male flare to two common quick-disconnect female fuel lines for fast, leak-resistant service connections.

This compact adapter streamlines fuel-system work on performance engines and swaps by combining a 6AN (9/16-18UNF) threaded flare inlet with two push-to-connect female outlets sized for 3/8" and 5/16" lines. Built from 6061-T6 aluminum and engineered for high-pressure use, the fitting integrates a 37° flare sealing surface and a plastic spring lock to help prevent accidental disconnection. It’s designed for applications like fuel rails, return lines, transmission coolers, and inline fuel sensors where reliable, serviceable connections matter.

How does this adapter maintain a leak-resistant fuel connection?

The fitting uses a 37° flare seat on the 6AN male thread to create a metal-on-metal seal when torqued correctly, minimizing potential leakage paths. The quick-disconnect female ends capture tubing with a plastic spring lock to secure lines during vibration-prone operation.

• 6AN male thread dimension: 9/16-18UNF for standard flare fittings
• 37° flare sealing angle for established fuel-system compatibility
• Plastic spring-lock mechanism on quick-disconnect ends for retention
• Dual outlet sizes: accepts 3/8" and 5/16" inner-diameter fuel lines

What pressure and temperature limits should I expect?

This adapter is rated for high-pressure fuel systems up to 1500 psi, making it suitable for many EFI and performance applications. The temperature tolerance spans from -40°F to 250°F, allowing use in both cold-start scenarios and under-bonnet heat exposure.

• Working pressure: up to 1500 psi
• Operating temperature range: -40°F to 250°F
• Appropriate for most gasoline and compatible fuel-system environments

What materials and construction details improve durability?

The main body is machined from 6061-T6 aluminum for a high strength-to-weight ratio and corrosion resistance in automotive environments. The quick-disconnect spring lock is molded from durable plastic to reduce wear on mating push fittings while keeping connections secure.

• Body: anodizable 6061-T6 aluminum for strength and corrosion resistance
• Lock: reinforced plastic spring for consistent engagement
• Precision-machined flare seat and threads for repeatable sealing

Which installations and setups is this fitting suited for?

It’s designed for retrofits, LS swaps and other projects where you need to adapt a 6AN feed to factory-style quick-disconnect fuel lines. The dual outlet sizes let you connect common OEM and aftermarket hose diameters without fabricating custom adapters.

• Fuel rails and injector return setups on EFI engines
• Transmission cooler feed/return adaptations requiring quick disconnects
• Integrating inline fuel sensors or flow meters into a 6AN line
• Performance swaps where space and serviceability are priorities

Who is this for: This EVIL ENERGY adapter is intended for automotive technicians, engine builders, and hobbyists working on high-performance or converted vehicles that require reliable, serviceable fuel connections. If you need to route a 6AN supply into factory-style 3/8" or 5/16" quick-disconnect hoses without welding or custom fittings, this piece simplifies plumbing while offering pressure and temperature ratings suitable for many EFI and aftermarket fuel-system applications.