Delphi FP10422 Fuel Injection Pressure Regulator

Fuel Pressure Control for Toyota Applications

The Delphi FP10422 fuel injection pressure regulator is built for Toyota fuel systems that require stable 42 psi system pressure. With OE-based engineering and a metal body, it supports consistent fuel delivery for select Tacoma, Tundra, 4Runner, and FJ Cruiser applications.

Compatible With 2005-2011 Toyota Tacoma and 2005-2011 Toyota Tundra, this regulator is a direct-fit service part for common fuel pressure concerns. The FP10422 also fits 2003-2009 Toyota 4Runner and 2007-2009 Toyota FJ Cruiser applications.

Key Features

• Delphi FP10422 fuel injection pressure regulator
• Metal construction for fuel system durability
• Fixed-pressure design with 42 psi system pressure
• 1 push-in inlet and 1 hose outlet
• Bolt-on mounting style
• No gauge port and no adjustment provision
• Inlet port diameter: 11.0 mm (0.43 in)
• Outlet port diameter: 8.0 mm (0.31 in)

Detailed Description

The Delphi FP10422 is a fuel injection pressure regulator engineered for Toyota fuel delivery systems that depend on controlled pressure at the rail. Delphi draws on more than a century of OE experience, and that heritage is reflected in the regulator’s metal construction, fixed 42 psi calibration, and application-specific fitment. If you are servicing a Toyota Tacoma fuel pressure regulator, Toyota Tundra fuel pressure regulator, or related Toyota fuel system component, this part provides the correct style of replacement for the listed vehicles.

This part cross-references Standard Ignition PR358 for the same application.

Common Issues It Can Address

• Fuel pressure that is too high or too low
• Hard starting caused by unstable fuel delivery
• Rough idle related to inconsistent rail pressure
• Fuel smell or rich-running symptoms tied to regulator failure
• Driveability problems on Toyota Tacoma, Tundra, 4Runner, or FJ Cruiser fuel systems

Installation Notes and Tips

• Verify the vehicle build date before ordering; some 2012 Toyota Tacoma and 2012 Toyota Tundra applications are limited by production cutoff dates.
• Confirm inlet and outlet port sizes before installation: 11.0 mm inlet and 8.0 mm outlet.
• Inspect fuel hoses, clamps, and sealing surfaces during replacement to help prevent leaks.
• Use the vehicle service procedure for fuel system depressurization before removing the old regulator.

Quality Assurance

Delphi builds this regulator using OE-based knowledge developed through supplier experience with major automakers. The FP10422 is made as a metal fuel system component with fixed-pressure operation for the listed Toyota applications.