Delphi FP10423 Fuel Injection Pressure Regulator

Fuel Pressure Control for OE Applications

The Delphi FP10423 fuel injection pressure regulator is built for precise fuel system control in select Infiniti and Nissan applications. With a metal body, 44 system pressure rating, and OE-informed engineering, it supports stable fuel delivery for consistent engine operation.

Compatible with 1997-2001 Infiniti Q45 and 1998-2001 Nissan Altima applications, the Delphi FP10423 is a direct-fit fuel injection pressure regulator for vehicles that require accurate pressure management in the fuel rail system.

Key Features

• Metal construction for fuel system durability
• 44 system pressure specification
• One push-in inlet and one hose outlet
• Bolt-on mounting style
• No gauge port and non-adjustable design
• OE-based engineering from Delphi, a long-time supplier to major automakers

Product Details

The Delphi FP10423 is a fuel injection pressure regulator designed to maintain the correct fuel pressure for the engine management system. It uses a 11.0 mm push-in inlet and a 9.0 mm hose outlet, with a single inlet and outlet layout that matches the original fuel system configuration on supported vehicles. This part number is commonly searched as Delphi FP10423 fuel pressure regulator for Infiniti Q45 and Nissan Altima fuel injection repair.

This part cross-references Beck/Arnley 158-0912 and Gates 23035 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 pressure regulation problems
• Fuel smell or rich-running symptoms from regulator failure
• Driveability issues tied to inconsistent injector pressure

Installation Notes

Verify inlet and outlet port sizes, mounting style, and system pressure before installation. This regulator uses a bolt mount, a push-in inlet, and a hose outlet, so the fuel line connections must match the original setup. Confirm vehicle application by year and model before ordering the Delphi FP10423.

Quality Assurance

Delphi draws on more than a century of OE experience and supplier knowledge used by major automakers. That OE heritage is reflected in the FP10423 fuel injection pressure regulator through application-focused design and material selection for supported Infiniti and Nissan fuel systems.