Delphi FP10478 Fuel Injection Pressure Regulator

Fuel Pressure Control for Lexus and Toyota

Delphi FP10478 is a fuel injection pressure regulator built for precise fuel system control in select Lexus and Toyota applications. It uses a metal body, a push-in inlet, and a threaded outlet to support a secure OE-style fit on the fuel rail system.

Compatible with 1992-1997 Lexus SC300, 1993-1997 Lexus GS300, and 1993-1997 Toyota Supra, this regulator is specified for a 43 psi system pressure and is built from Delphi OE heritage knowledge developed through decades of supplier experience.

Key Features

• Delphi FP10478 fuel injection pressure regulator
• Metal construction for fuel system durability
• Push-in inlet and threaded outlet design
• Single inlet and single outlet configuration
• Bolt-on mounting type
• 43 psi system pressure specification
• No adjustable setting and no gauge port

Detailed Product Overview

This fuel injection pressure regulator helps maintain consistent fuel pressure delivery for the engine management system. Delphi FP10478 is engineered with OE-focused design knowledge and is a direct-fit style replacement for select Lexus GS300, Lexus SC300, and Toyota Supra fuel systems. The inlet measures 11.0 mm and the outlet measures 10.0 mm, supporting the specified connection style for the application.

This part cross-references Beck/Arnley 158-0969 and Gates 23028 for the same application.

What It Helps Solve

• Fuel pressure that is too high or too low
• Rough idle caused by unstable fuel delivery
• Hard starting related to pressure regulation issues
• Fuel mixture problems tied to inconsistent rail pressure
• Driveability concerns in Lexus SC300, Lexus GS300, and Toyota Supra applications

Installation Notes and Tips

Verify the inlet and outlet connection style, mounting location, and system pressure before installation. Confirm that the vehicle uses the specified 43 psi fuel system setup and compare the original regulator to Delphi FP10478 for port size and mounting alignment. For best results, inspect the surrounding fuel lines and seals during replacement.

Quality Assurance

Delphi draws on more than 100 years of OE experience and supplier knowledge from work with major automakers. That OE background is reflected in the design and specification of FP10478 for consistent aftermarket replacement performance.