The AEM adjustable fuel pressure regulator is designed for EFI fuel systems and provides precise fuel pressure control under both vacuum and boost conditions. It is ideal for motorsport, drag racing and other high-performance engine builds where a stable fuel supply is essential. The regulator supports fuel systems for engines producing up to 1,000 horsepower.
The regulator features a 1:1 vacuum/boost reference ratio, meaning fuel pressure increases in direct proportion to boost pressure. This maintains a constant pressure differential across the injectors and ensures accurate fuel delivery in both naturally aspirated and turbocharged engines. Fuel pressure is adjustable from 20 PSI up to the maximum capacity of the fuel pump.
The housing is CNC-machined from 6061-T6 aluminium with a black anodised finish. The patented interchangeable discharge port allows the regulator's flow capacity to be matched to different fuel pumps, providing optimum performance across a wide range of EFI fuel systems.
Specifications:
Type: EFI return regulator (bypass)
Material: CNC-machined 6061-T6 aluminium
Finish: Black anodised
Adjustable fuel pressure: 20 PSI to the fuel pump's maximum capacity
Pressure reference: 1:1 vacuum/boost reference
Power capacity: Up to 1,000 HP
Fuel compatibility: Petrol, E85 and alcohol-based fuels
Inlets: 2 x AN6 ORB (2 x 9/16"-18 UNF)
Return port: 1 x AN6 ORB (9/16"-18 UNF)
Return connection: 90° banjo fitting with hose barb for the original return hose
Mounting: Directly to compatible fuel rail
Application: EFI fuel systems
Part number: 25-304BK
Fits:
Acura CL 2.2 (F22B1) (1997)
Honda Accord 2.2 (F22B1/F22B2) (1994-1997)
Honda Civic EX 1.6 VTEC (D16Y8) (1996-2000)
Honda Del Sol Si 1.6 VTEC (D16Y8) (1996-1997)
Honda CR-V 2.0 (B20B4) (1997-1998)
Fits engine codes:
B20B4 / D16Y8 / F22B1 / F22B2
