Delphi FP10456 Fuel Injection Pressure Regulator

Fuel Pressure Control for Mazda Protege

The Delphi FP10456 fuel injection pressure regulator is built for precise fuel system control in 1995-1998 Mazda Protege applications. It uses OE-based engineering and metal construction to help maintain the specified 44 psi system pressure for consistent injector performance.

Compatible with 1995-1998 Mazda Protege fuel injection systems, this regulator features a push-in inlet, hose outlet, and bolt-on mounting for a direct replacement approach. Delphi’s OE heritage and supplier experience are reflected in the design and material selection of the FP10456.

Key Features

• Fuel injection pressure regulator for air and fuel delivery systems
• Metal construction for durability in engine bay conditions
• Set system pressure: 44 psi
• Push-in inlet with 11.0 mm inlet port diameter
• Hose outlet with 8.0 mm outlet port diameter
• Bolt mounting type for secure installation
• No gauge port and non-adjustable design

Detailed Description

Delphi FP10456 is a fuel injection pressure regulator engineered for Mazda Protege models from 1995 through 1998. It helps regulate fuel pressure at the rail or delivery point so the injection system can maintain stable fuel flow under changing engine demand. The regulator’s 44 psi system pressure specification, single inlet, and single outlet configuration make it a focused replacement part for the listed application. This part cross-references Dorman OE Solutions 800-354 for the same application.

What It Helps Address

• Fuel pressure that is too high or too low
• Rough idle caused by unstable fuel delivery
• Hard starting related to inconsistent injector pressure
• Fuel trim issues tied to pressure regulation problems
• Driveability concerns in a 1995-1998 Mazda Protege fuel system

Installation Notes and Tips

Verify inlet and outlet port sizes, mounting style, and system pressure before installation. The FP10456 uses a push-in inlet and hose outlet, so hose condition and seal integrity should be checked during replacement. Confirm the vehicle’s fuel system specification matches the 44 psi regulator rating before service.

Quality Assurance

Delphi builds aftermarket parts using OE experience and knowledge developed through long-term supplier relationships with major automakers. The FP10456 reflects that OE-based approach in its materials, fitment focus, and pressure specification.