Delphi HM10109 Direct Injection High Pressure Fuel Pump

Direct Injection Fuel Pump for Mercedes-Benz and INFINITI

Delphi HM10109 is a standard replacement direct injection high pressure fuel pump for gas applications. Built with OE heritage from a supplier to major automakers, it brings factory-style fit and function to select Mercedes-Benz and INFINITI models.

Compatible with Mercedes-Benz C300, E300, GLC300, Metris, Sprinter 1500, Sprinter 2500, and INFINITI Q50 and Q60 applications, this pump is designed for direct injection fuel systems that require precise high-pressure delivery. The Delphi HM10109 also cross-references Bosch 66804 for the same application.

Key Features

• Direct injection high pressure fuel pump for gas engines
• Mechanical pump design with metal housing
• External mounting style with threaded outlet connection
• Hose inlet with 0.313 in. outside diameter
• Outlet fitting thread size: M14-1.5
• Gasket or seal included; mounting hardware not included
• Blade terminals, 2-terminal male connection
• Standard replacement grade for OE-style service

Detailed Description

The Delphi HM10109 is built for direct injection fuel delivery on select Mercedes-Benz and INFINITI vehicles. It uses a mechanical, external pump layout with a silver metal housing, threaded outlet ports, and a hose-style inlet to match the original system architecture. The included gasket or seal supports proper sealing during replacement, while the blade terminal design and two-terminal male connection follow common OE service configurations.

This part number is used across multiple late-model applications, including Fits 2015-2018 Mercedes-Benz C300, N/A; Fits 2016-2018 Mercedes-Benz C350e, N/A; Fits 2017-2019 Mercedes-Benz E300, N/A; Fits 2016-2019 Mercedes-Benz GLC300, N/A; Fits 2016-2023 Mercedes-Benz Metris, N/A; Fits 2019-2023 Mercedes-Benz Sprinter 1500, N/A; Fits 2019-2023 Mercedes-Benz Sprinter 2500, N/A; Fits 2016-2019 INFINITI Q50, N/A; and Fits 2017-2018 INFINITI Q60, N/A. It also fits 2018-2020 Mercedes-Benz GLC350e, 2017-2020 Mercedes-Benz SLC300, and 2016 Mercedes-Benz SLK300, N/A.

What This Pump Helps Address

• Hard starting caused by low high-pressure fuel delivery
• Fuel pressure loss in direct injection systems
• Engine hesitation or stumble under load
• Driveability issues tied to a worn mechanical fuel pump
• Fuel system faults on select Mercedes-Benz and INFINITI models

Installation Notes and Tips

Verify the outlet thread size, inlet style, and terminal configuration before installation. Inspect the sealing surface and replace any damaged fuel system seals during service. Because mounting hardware and wiring harness are not included, reuse or source the correct vehicle-specific components as needed. Confirm exact vehicle application by year, make, and model before ordering.

Quality Assurance

Delphi draws on more than 100 years of OE experience and a broad aftermarket portfolio built from original equipment knowledge. The HM10109 is a standard replacement fuel pump engineered to meet the needs of select Mercedes-Benz and INFINITI direct injection applications.