High-pressure pump MERCEDES Classe C (W203) 270 CDI 170 hp

The high-pressure pump is the heart of the Mercedes-Benz OM651 2.1-liter diesel engine, found in models like the 270 CDI with 170 horsepower. This category covers remanufactured and exchange-standard pumps designed to restore fuel delivery precision after wear or failure. Whether you’re a professional mechanic, a stranded driver, or a hands-on enthusiast, this section helps you locate the exact replacement for your vehicle’s motorization, avoiding costly misfits.

Our range is built around wholesale partnerships with leading suppliers, ensuring each high-pressure pump meets the OM651’s demanding specifications. The pumps are sourced from remanufacturing specialists who restore original performance through rigorous testing, including pressure curve validation and leak checks. This approach delivers consistent quality without the premium of a brand-new OEM unit.

Professional uses by trade

Different users approach high-pressure pump replacement with distinct priorities. Garages focus on turnaround time and compatibility, while DIYers seek clarity on installation steps. German buyers often prioritize long-term reliability and ease of sourcing. Understanding these needs helps streamline the selection process for everyone involved.

• Le garagiste independant : Replace the pump during scheduled maintenance to prevent unexpected breakdowns, ensuring customer vehicles return on time with restored power.
• Le garagiste independant : Stock exchange-standard pumps to reduce downtime for common OM651 failures, balancing inventory costs with service reliability.
• L'automobiliste depanne : Diagnose symptoms like rough idling or white smoke by checking the high-pressure pump’s pressure output before committing to a replacement.
• L'automobiliste depanne : Order a remanufactured pump as a direct swap to avoid the hassle of core returns or core deposits when possible.
• Le passionne qui fait lui-meme : Verify the pump’s compatibility with your 270 CDI’s motor code (OM651) before purchasing, using the vehicle’s VIN or engine sticker.
• Le passionne qui fait lui-meme : Follow a step-by-step guide to remove the old pump and install the new one, ensuring proper torque on fittings to prevent leaks.
• Der deutsche Kaeufer (DACH) : Prioritize pumps with long warranties and clear return policies, as German regulations favor consumer protection in automotive repairs.

Range comparison

Below, you’ll find the two high-pressure pump references compatible with the Mercedes-Benz 270 CDI 170 hp OM651 engine. Each option is presented with its key attributes to simplify your selection process.

How to choose

Selecting the right high-pressure pump involves more than matching the part number. Consider factors like the pump’s condition, packaging for storage, and the supplier’s return policy to avoid costly mistakes.

1. Opt for exchange-standard pumps when immediate availability is critical, as they require no core deposit and ship ready to install.
2. Choose remanufactured pumps for high-mileage engines, as they often include upgraded components like reinforced housings or improved seals.
3. Verify the pump’s pressure curve matches the OM651’s specifications to ensure consistent fuel delivery and prevent engine stress.
4. Prioritize suppliers with a transparent return process for defective units, reducing the risk of downtime during busy repair seasons.
5. Check the packaging for moisture barriers and anti-corrosion measures, as these extend shelf life in workshop storage.
6. Confirm the pump’s compatibility with your vehicle’s production year, as minor design changes may affect fitment.
7. Select pumps from suppliers with a track record in diesel applications, as they understand the unique demands of OM651 engines.

Storage & logistics

Storing high-pressure pumps requires protection from humidity, temperature fluctuations, and physical damage. Keep units in their original packaging until installation, and store them off the floor to avoid contamination from workshop debris. For bulk orders, use climate-controlled shelving to prevent seal degradation. Always handle pumps by the housing to avoid damaging sensitive internal components, and inspect for leaks or corrosion before installation. A well-organized inventory system ensures FIFO rotation, reducing the risk of expired stock.

Since 2026, we’ve seen too many OM651 pumps fail prematurely due to neglected fuel filters or poor-quality diesel. Our remanufactured units undergo pressure testing to 2,000 bar, ensuring they meet the engine’s demands. We stand by our pumps because we’ve tested them under real-world conditions—no shortcuts, no surprises.— autoKUR team

Related categories

Browse our other ranges:

• 30 CDI AMG 231 hp
• 320 CDI 224 hp
• 220 CDI 150 hp
• 220 CDI 143 hp
• 220 CDI 136 hp
• 200 CDI 122 hp

Useful references

For regulatory and sector references, see Reglement (UE) 461/2010 — pieces de rechange et garantie constructeur.