Mercedes-Benz W204 W212 High Pressure Fuel Pump A27115004 - Used Original Parts

Diagnosis and Common Symptoms

In modern German direct injection engines, the high-pressure fuel pump (HPFP) is a critical mechanical component driven by the camshaft. When the internal plunger seals or the fuel volume control valve fail on this M271-era engine, the system loses the ability to maintain the required target rail pressure under load. Drivers will typically experience extended cranking times during cold starts, severe hesitation, engine misfires, and an immediate drop into limp mode to protect the catalytic converters. A prominent dashboard warning will be an illuminated Check Engine Light accompanied by common OBD2 fault codes such as P0087 (Fuel Rail/System Pressure Too Low), P0088 (Fuel Rail/System Pressure Too High), or P0191 (Fuel Rail Pressure Sensor Range/Performance). In severe cases of internal seal failure, fuel can bypass the pump housing and leak directly into the crankcase, causing a strong odor of gasoline in the engine oil—a condition that requires immediate repair to prevent catastrophic bearing failure.

Introduction

As a Senior Technician at M.S. Motor, I know firsthand that high-pressure fuel delivery components must meet strict factory specifications to avoid dangerous lean-burn conditions. This unit is a Genuine used high-pressure fuel pump that has been meticulously inspected and tested to ensure the internal regulator and mechanical plunger operate seamlessly under load. By choosing a verified Genuine replacement, you bypass the inconsistency of aftermarket alternatives and instantly restore precise direct injection pressure to your vehicle.

Product Details

• Brand: Mercedes-Benz
• Model Compatibility: W204 (C-Class), W212 (E-Class)
• Part Name: High Pressure Fuel Pump
• Part Number: A27115004
• Condition: Genuine Used (Tested Working)
• Notes: It is highly recommended to inspect the camshaft lobe and replace the mechanical roller tappet/follower during installation. Meticulously clean all fuel rail connections prior to assembly to prevent introducing microscopic debris into the direct injectors.