Delphi FP10548 Fuel Injection Pressure Regulator

Fuel Pressure Control for Hyundai and Kia

The Delphi FP10548 fuel injection pressure regulator is built for precise fuel system control in select Hyundai Sonata and Kia Optima applications. It uses a metal body, a push-in inlet, and a hose-style outlet to support a secure OE-style connection in the fuel delivery system.

With a fixed 50 system pressure rating and no gauge port or adjustability, this regulator is made for direct replacement use where consistent fuel pressure is required. Delphi’s OE heritage and supplier experience are reflected in the design and material selection of the FP10548.

Key Features

• Metal construction for fuel system durability
• Push-in inlet with 13.0 mm inlet port diameter
• Hose outlet with 8.0 mm outlet port diameter
• Fixed 50 system pressure specification
• Clamp mounting type for secure installation
• No gauge port and no adjustable setting
• Fits 2006-2010 Hyundai Sonata
• Fits 2006-2010 Kia Optima

Detailed Description

Delphi FP10548 is a fuel injection pressure regulator engineered for vehicles that require stable fuel pressure at the fuel rail or delivery circuit. The metal housing, single inlet and outlet configuration, and OE-style port sizing help maintain proper fuel flow characteristics in the application. This part cross-references Beck/Arnley 158-0747 and Dorman - OE Solutions 800-502 for the same application. The FP10548 is a practical replacement choice for 2006-2010 Hyundai Sonata and 2006-2010 Kia Optima models where the original regulator has failed or fuel pressure control has become inconsistent.

Common Issues This Part May Address

• Hard starting caused by unstable fuel pressure
• Rough idle related to fuel delivery irregularities
• Fuel pressure loss after shutdown
• Engine hesitation during acceleration
• Fuel system performance problems tied to a worn regulator

Installation Notes and Tips

Verify inlet and outlet port sizes, mounting style, and system pressure before installation. Confirm the vehicle application for 2006-2010 Hyundai Sonata or 2006-2010 Kia Optima and inspect fuel lines, clamps, and sealing surfaces for wear before fitting the new regulator. Because this unit is not adjustable and does not include a gauge port, system verification should be performed with the vehicle’s fuel system configuration in mind.

Quality Assurance

Delphi draws on more than a century of OE experience and supplier knowledge used by major automakers, with that background reflected in the FP10548 replacement design.