EVIL ENERGY EFI Fuel Pressure Regulator Kit Adjustable 20–120 PSI with Gauge, AN Fittings & PTFE Hose (Black)

EVIL ENERGY's adjustable EFI fuel pressure regulator kit delivers precise, tunable fuel pressure control (20–120 PSI) with a built-in gauge and complete AN fittings for universal EFI installations.

This all-in-one kit is designed for aftermarket and performance fuel systems that require accurate bypass regulation of gasoline, E85 and other alcohol/ethanol blends (not for diesel). The aluminum regulator is adjustable across a broad range, comes with a pressure gauge and a full assortment of AN fittings and PTFE hose so you can route and tune fuel pressure for carbureted replacements, EFI conversions, or upgraded injectors.

How do I adjust and read fuel pressure with this kit?

Adjustment is straightforward: use the included Allen key to change preload on the regulator spring, and observe pressure on the integrated gauge. A replacement spring is supplied so you can alter spring rates for higher or lower baseline pressure ranges when tuning.

• Adjustment range: 20–120 PSI for broad compatibility
• Included pressure gauge for direct readings under load
• Allen key and spare spring for on-vehicle tuning
• Use thread sealant tape on NPT gauge port when installing

What parts and fittings come with the EVIL ENERGY regulator kit?

The package includes everything needed to plumb and seal the regulator into most EFI systems: the regulator body, gauge, PTFE fuel hose, multiple AN fittings and ORB adapters, plus a hose separator clamp to keep lines neat and secure. This assortment reduces the need for additional purchases and simplifies installation when upgrading or replacing an existing regulator.

• 1x fuel pressure regulator and 1x pressure gauge
• 1x AN6 PTFE fuel line and multiple AN6/AN10 ORB fittings
• 2x AN6 straight, 2x 90°, 2x 45° fittings for routing flexibility
• Accessory pack: replacement spring, AN10 port plug, Allen key, sealant tape, hose clamp

Will this regulator work with my fuel type and vehicle?

It accepts gasoline and alcohol/ethanol fuels including E85, but is not compatible with diesel. The kit is intended for most EFI applications—universal in fit—but professional installation is recommended for correct plumbing, safe mounting, and leak-free sealing.

• Compatible: gasoline, E85, alcohol/ethanol fuels
• Not compatible: diesel fuel or systems requiring diesel-rated components
• Nylon braided line in kit is not E85-safe—use provided PTFE hose for alcohol blends
• Professional installation advised to ensure safe, leak-free operation

How does the kit help during performance tuning or injector upgrades?

Maintaining consistent fuel pressure is critical when upgrading injectors or increasing engine output. This regulator’s wide adjustment range and included gauge let tuners set precise rail pressure to match fueling targets, stabilize idle and transient response, and prevent over- or under-fueling under boost or high load.

• Wide pressure window supports various injector sizes and boost levels
• On-vehicle gauge simplifies live tuning and verification
• Multiple fittings help route the return line cleanly in tight engine bays
• Replacement spring allows quick changes in spring rate for tuning setups

Who is this for? EVIL ENERGY's Adjustable EFI Fuel Pressure Regulator Kit is aimed at DIY enthusiasts, professional tuners, and shop technicians upgrading fuel systems on performance cars, street builds, or EFI conversions. If you need a compact, adjustable regulator with comprehensive fittings and a visible gauge for accurate tuning—especially with gasoline or ethanol fuels—this kit provides a versatile, ready-to-install solution. Note: have a qualified technician perform installation if you’re unsure about fuel system work.