EVIL ENERGY EFI Fuel Pressure Regulator Kit Adjustable 20-120 PSI — Black Aluminum with Gauge & AN6 Hose

EVIL ENERGY's adjustable EFI fuel pressure regulator kit is a complete aluminum regulator system (20–120 PSI) with gauge, fittings, and AN6 CPE fuel hose for fine-tuning fuel pressure on most gasoline EFI applications.

This all-in-one kit provides a versatile, serviceable solution for restoring consistent fuel delivery, supporting gasoline and ethanol-blended fuels (regulator only), and accommodating different pressure requirements with an included replacement spring and a top-mounted adjustment screw. The aluminum regulator body is finished in black and ships with a mechanical gauge, multiple AN fittings, a length of AN6 CPE fuel line (gasoline-rated), and installation accessories to simplify plumbing into existing EFI systems.

How do I set the regulator to the correct fuel pressure?

Adjusting pressure is done with the set screw atop the regulator and by swapping springs to change the operating range. The kit comes pre-fitted with a spring for 20–75 PSI and a stronger spring for 75–120 PSI; turn the adjustment screw clockwise to raise pressure and counterclockwise to lower it.

• Use the pre-installed spring for 20–75 PSI tuning and swap to the included replacement spring for 75–120 PSI ranges.
• Monitor the included mechanical gauge while making incremental adjustments to avoid over-pressurizing.
• Seal threaded gauge ports with the supplied tape and tighten fittings to specified torque values.

Will this regulator work with my fuel type and car?

The regulator body is chemically compatible with gasoline, E85 and ethanol blends, but the supplied CPE fuel line is rated only for gasoline. It’s suitable for most EFI systems, from street cars to many performance setups, but verify hose compatibility if you plan to run high-ethanol fuels.

• Regulator materials accept gasoline and alcohol/ethanol blends; use ethanol-compatible hoses when required.
• AN fittings and included adapters cover common plumbing configurations for EFI return systems.
• Professional installation is recommended for custom or high-pressure fuel systems.

What hardware and fittings are included in the kit?

The kit is comprehensive, supplying a regulator, gauge, extra spring, a variety of AN fittings, a length of AN6 CPE fuel hose, and small installation tools. That makes it ready for many common installs without immediate additional purchases.

• One regulator, one mechanical pressure gauge, and one replacement spring for higher pressure ranges.
• AN6 hose, AN6-to-AN6 ORB and AN6-to-AN10 ORB fittings, straight/90°/45° AN6 fittings, and an AN10 port plug.
• Includes Allen key, thread sealant tape, and a hose separator clamp for clean routing.

How should I install this regulator safely?

Installation requires careful sealing of NPT gauge threads and proper routing of fuel lines to avoid heat and abrasion. Use the supplied sealant tape on threaded gauge ports, tighten fittings correctly, and have a qualified technician perform the work if you’re not experienced with fuel-system plumbing.

• Always use the supplied thread sealant tape for the gauge port and any NPT threads.
• Keep the CPE hose away from exhaust components and use the hose clamp to secure routing.
• Pressure-test the system after installation and check for leaks before starting the engine.

Who this is for: This EVIL ENERGY kit suits DIY mechanics and tuners who want a compact, adjustable EFI return-style regulator with a visible gauge. It’s ideal for automotive enthusiasts upgrading fuel delivery, repairing inconsistent pressure, or building custom EFI systems—provided you match hose compatibility to your chosen fuel. If you run high-ethanol content fuels or require stainless braided lines, plan to replace the included CPE hose with ethanol-rated alternatives.