Delphi FP10666 Fuel Injection Pressure Regulator

Fuel Pressure Control for Lexus and Toyota

The Delphi FP10666 fuel injection pressure regulator is built for in-tank fuel system applications that require stable 38 psi system pressure. With a metal body, push-in inlet, returnless outlet, and clamp mounting, it is a direct-fit style replacement for select Lexus and Toyota models, including Lexus GS F, RC F, and Toyota Avalon applications.

Key Features

• Metal construction for fuel system durability
• Fixed-pressure design set at 38 psi
• Push-in inlet with returnless outlet configuration
• Clamp-mounted, in-tank style regulator
• No gauge port and no adjustment provision
• OE-focused design backed by Delphi’s aftermarket engineering experience

Application Details

Delphi FP10666 is a fuel injection pressure regulator for select Lexus and Toyota vehicles with in-tank fuel delivery systems. It is listed for applications such as 2015-2017 Lexus RC F, 2018-2019 Lexus RC F, 2020-2022 Lexus RC F, 2018-2019 Lexus LC500, 2020-2021 Lexus LC500, 2016-2017 Lexus GS F, 2020 Lexus GS F, 2013-2017 Toyota Avalon, and 2018 Toyota Avalon. This part cross-references Dorman OE Solutions 800-607 and Standard Ignition PR495 for the same application.

What It Helps Address

• Fuel pressure that is too high or too low in the in-tank system
• Hard starting caused by unstable fuel delivery
• Rough idle related to inconsistent injector pressure
• Fuel trim issues tied to pressure regulation faults
• Driveability complaints on Lexus RC F, GS F, LC500, and Toyota Avalon models

Installation Notes and Tips

Verify the vehicle’s fuel tank configuration, inlet style, and stamped reference number before installation. This regulator is not adjustable and does not include a gauge port. Confirm the OE-style 38 psi specification and match the application notes, including in-tank and O-ring requirements where listed for the vehicle.

Quality Assurance

Delphi draws on more than 100 years of OE experience and supplier knowledge used by major automakers. That OE heritage is reflected in the FP10666’s materials, fitment focus, and fuel system design for Lexus and Toyota applications.