Buy Mercedes-Benz GL350 Diesel Exhaust Fluid (DEF) Pumps

The Diesel Exhaust Fluid (DEF) Pump is a crucial component in modern diesel engines equipped with emission control systems. Also known as the urea pump or AdBlue pump, it delivers DEF into the exhaust stream to reduce harmful nitrogen oxide (NOx) emissions. By injecting DEF into the Selective Catalytic Reduction (SCR) system, the pump helps convert NOx gases into harmless nitrogen and water vapor, ensuring the vehicle complies with environmental regulations.

A malfunctioning DEF Pump can lead to several noticeable issues:

illuminated Warning Lights: The check engine light or a DEF system warning may appear on the dashboard.
Reduced Engine Performance: The vehicle might experience a loss of power or enter a limp mode to prevent damage.
Increased Emissions: Failing to inject DEF properly can result in higher NOx emissions.
Unusual Noises: Grinding or whining sounds from the DEF tank area may indicate pump problems.
Poor Fuel Economy: Inefficient emission control can lead to decreased fuel efficiency.

When the DEF Pump fails or malfunctions, specific diagnostic trouble codes (DTCs) may be stored in the vehicle's computer system:

P20E8: Reductant Pressure Too Low
P20E9: Reductant Pressure Too High
P204C: Reductant Pressure Sensor Circuit Low
P204D: Reductant Pressure Sensor Circuit High
P204F: Reductant System Performance

These codes help technicians identify issues related to the DEF delivery system for timely repairs.

Proper maintenance of the DEF Pump ensures longevity and optimal performance:

Use Quality DEF: Always fill the DEF tank with high-quality, certified diesel exhaust fluid to prevent contamination.
Keep the System Clean: Regularly check and clean the DEF tank cap and surrounding areas to avoid dirt ingress.
Monitor DEF Levels: Refill the DEF tank before it becomes empty to prevent air from entering the system.
Protect Against Freezing: In cold climates, ensure the DEF system heaters are functioning to prevent fluid freezing.
Schedule Regular Inspections: Have the emission control system inspected during routine maintenance to detect early signs of wear or damage.

When replacing the DEF Pump, careful installation is essential:

Follow Manufacturer Instructions: Use the guidelines provided by the vehicle manufacturer for proper installation procedures.
Handle with Care: Avoid contaminating the pump or DEF lines with dirt or debris during installation.
Check Connections: Ensure all electrical connectors and hoses are securely attached and free from damage.
Prime the System: After installation, prime the DEF system if required to remove any air pockets.
Verify Operation: Test the system to confirm the new pump is functioning correctly and there are no leaks.

The DEF Pump plays a significant role in reducing the environmental footprint of diesel engines:

Emission Reduction: By facilitating the breakdown of NOx emissions, it helps decrease air pollution and contributes to cleaner air quality.
Regulatory Compliance: Proper functioning ensures the vehicle meets emission standards set by environmental agencies.

Various terms are used interchangeably with DEF Pump:

Urea Pump
AdBlue Pump (commonly used in Europe)
SCR Injection Pump
Emission Reduction Pump
Reductant Pump

Understanding these synonyms can aid in identifying the correct component for maintenance or replacement.