Delphi FP10517 Fuel Injection Pressure Regulator

Delphi FP10517 Fuel Pressure Regulator

The Delphi FP10517 fuel injection pressure regulator is a metal OE-style replacement built for precise fuel system control. It draws on Delphi’s long OE supply background and is suited for select Porsche applications that need stable fuel pressure at the rail.

Key Features

• Metal construction for fuel system durability
• Threaded inlet for secure connection
• Bolt-style outlet for application-specific mounting
• Single inlet and single outlet layout
• No gauge port
• Non-adjustable design for factory-style pressure regulation

Application Details

Compatible with 1989 Porsche 944, from engine 47K 02564, and 1987-1988 Porsche 924 with automatic transmission. This Delphi FP10517 fuel injection pressure regulator is a direct-fit service part for Porsche 944 and Porsche 924 fuel system repair where the original regulator has worn or failed.

This part cross-references Gates 21851 for the same application.

What It Helps Fix

• Fuel pressure that is too high or too low at the injection system
• Hard starting caused by inconsistent fuel delivery
• Rough idle related to unstable regulator operation
• Fuel mixture issues tied to pressure control problems
• Fuel system drivability complaints on Porsche 944 and Porsche 924 models

Installation Notes

Verify the threaded inlet, bolt outlet, and no-gauge-port configuration before installation. Confirm vehicle fitment by year, model, transmission, and engine note for the 1989 Porsche 944 application. Inspect related fuel lines, seals, and mounting points during replacement to ensure proper system sealing and pressure control.

Quality Assurance

Delphi builds aftermarket parts using OE heritage and engineering knowledge developed through supply relationships with major automakers. FP10517 is produced to support factory-style fuel pressure regulation in the specified Porsche applications.