1409391 | Genuine Cummins® 12V Doser Pump For ISB/QSB/EURO V

1. Emissions Control in Diesel Engines

In diesel trucks, buses, and heavy equipment, a doser pump is used in the SCR (Selective Catalytic Reduction) system.

It:

• Pumps Diesel Exhaust Fluid (DEF) from the DEF tank.
• Delivers the correct amount of DEF to the exhaust.
• Helps convert harmful nitrogen oxides (NOx) into harmless nitrogen and water.
• Enables the vehicle to meet emissions regulations.

Benefits

• Reduced emissions.
• Compliance with environmental standards.
• Improved engine operation.

2. Chemical Injection

In industrial and water-treatment systems, a doser pump:

• Injects chemicals at precise rates.
• Controls chemical concentration.
• Prevents over- or under-dosing.

Common uses:

• Water purification
• Chlorination systems
• pH control
• Boiler and cooling tower treatment

3. Fuel and Additive Dosing

Some engines and industrial systems use doser pumps to:

• Inject fuel additives.
• Supply fuel for regeneration of emission-control devices such as diesel particulate filters (DPFs).
• Improve combustion or system performance.

1. Check Engine Light or Warning Messages

• Check engine light illuminates.
• SCR, DEF, or emissions system warnings appear on the dashboard.
• Diagnostic trouble codes (DTCs) are stored in the engine computer.

2. Engine Derate (Reduced Power)

• The vehicle loses power.
• Maximum speed may be limited.
• The engine enters a protection mode due to emissions-system faults.

3. Increased Emissions

• The SCR system cannot reduce NOx emissions properly.
• The vehicle may fail an emissions test.

4. Abnormal DEF Consumption

• DEF level drops unusually fast (over-dosing).
• DEF level barely changes (under-dosing or no dosing).

5. Poor SCR Performance Faults

Common fault descriptions may include:

• Low DEF pressure
• DEF dosing malfunction
• SCR efficiency below threshold
• Dosing valve performance issues

6. Crystallized DEF Deposits

• White crystal deposits around DEF lines, fittings, or the injector.
• Can indicate leakage or improper dosing.

7. Difficulty Completing Regeneration

On some systems that use dosing for regeneration:

• Regeneration fails or takes longer than normal.
• DPF-related fault codes may appear.

8. Unusual Pump Noise

• Pump runs excessively.
• Clicking, grinding, or whining noises.
• No pump operation when commanded by diagnostics.