Why doesn't the urea pump make noise after the engine is turned off?

1 Answers
DelEllie
07/25/25 8:17am
The noise after the urea pump stops is due to the urea being drawn back. The pump needs to run for a while during driving. If the vehicle is started cold and not driven for long, the urea pump will not make noise. Here are specific details about the urea pump: 1. Introduction: 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. 2. Composition: It mainly consists of a motor, supply pump, reverse pump, switch valve, pressure chamber, throttle hole, etc.
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