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What are the reasons for the urea pump failing to build pressure?

2 Answers

MiguelDella

07/29/25 7:52pm

Failure of the urea pump to build pressure may be due to issues with the post-processing control system or urea pipe joints. Introduction to the urea pump: The urea pump is an important component of the urea solution injection metering system. Its main function is to extract urea solution from the urea tank, maintain a certain pressure, and then deliver it to the injection unit to meet the flow and pressure requirements of the injection metering system. Function of the urea pump: The urea pump pumps urea solution from the urea tank and transports it to the nozzle through the delivery pipeline. It has advantages such as good safety, low fuel consumption, and excellent sulfur resistance.

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DeCora

08/14/25 3:35pm

Last time my car's urea pump failed to build pressure, which was quite a headache. Common causes include urea crystallization clogging the pipes—that liquid tends to solidify in cold weather and block the pump inlet, preventing pressure buildup; electrical issues such as a blown fuse or a faulty relay, cutting off power and rendering it inoperable; the pump itself aging, wearing out, or the motor malfunctioning, making it unable to pump the liquid; or sensor failures like temperature or pressure sensors malfunctioning, which can also disrupt control signals. I recommend first checking if the urea fluid level is sufficient and the quality is pure, as diluted or inferior-quality urea can easily cause problems. Regular cleaning of the urea nozzle and filter is essential to avoid buildup. If the pump fails to build pressure, the car might display a fault code—it's best to get it checked at a repair shop promptly to avoid affecting the emission system. Driving safety is paramount, so don’t risk driving if there’s an issue.

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