EVIL ENERGY Adjustable 6AN Fuel Pressure Regulator 30–70 PSI, Black - EFI Bypass with Gauge

EVIL ENERGY's 6AN adjustable bypass fuel pressure regulator delivers stable, tunable fuel pressure for gasoline and ethanol EFI systems, adjustable from 30 to 70 PSI.

Built for tuners, performance hobbyists, and engine builders, this compact black bypass regulator controls fuel pressure precisely for aftermarket EFI setups. It accepts gasoline and E85 (avoid diesel), includes mounting hardware and fittings for common EFI plumbing, and ships with a gauge so you can dial in pressure at the rail. The design prioritizes leak-free connections when installed per instructions and features a top-mounted set screw for quick adjustment.

How do I set and adjust the regulator's fuel pressure?

Adjusting pressure is done with the knurled set screw on the top of the regulator. Turn clockwise to increase pressure and counterclockwise to decrease it; verify readings with the included gauge while the engine or fuel pump is running.

• Adjustment range: 30–70 PSI
• Top-mounted set screw for quick tuning
• Use the supplied pressure gauge port with thread sealant tape
• Confirm pressure under operating conditions to avoid lean/rich issues

Which fuels and systems is this regulator compatible with?

This bypass regulator is designed for EFI systems and is compatible with gasoline, E85 and alcohol/ethanol blends. It is not compatible with diesel, and take care with some braided fuel lines—nylon-braided lines included are not recommended for continuous E85 use.

• Fits most EFI applications as a bypass/return-style regulator
• Compatible fuels: gasoline, E85, alcohol/ethanol
• Not for diesel fuel systems
• Avoid nylon-braided supplied hose for long-term E85 exposure

What fittings and parts come with the regulator, and how should I connect them?

The kit includes multiple AN fittings, port plugs, a mounting bracket and braided fuel hose to simplify installation in popular setups. Some included M-type fittings are intended for fuel rail connections only—do not thread them directly into the regulator body or leaks may occur.

• Included: regulator, pressure gauge, bracket, AN6 port plugs, ORB and barb fittings, 6AN-to-M fittings, 3 braided fuel lines
• Use thread sealant tape on the NPT gauge port when installing
• 6AN-to-M12x1.25 and 6AN-to-M14x1.5 fittings: only for fuel rail use
• Follow torque and sealing best practices to prevent leaks

Who is this for? EVIL ENERGY's adjustable 6AN EFI bypass regulator is aimed at automotive enthusiasts, street/track tuners, and anyone installing or upgrading an EFI fuel system who needs a dependable, user-adjustable way to control rail pressure between 30 and 70 PSI. It suits aftermarket fuel rails, return-style systems and custom plumbing where a compact, serviceable regulator with included fittings and gauge speeds installation and setup.