Where is the urea pump filter screen located?
2 Answers
The urea filter screen is located on the urea pump of the vehicle. Below is an introduction to the function and structure of the urea pump: Function of the urea pump: It extracts the urea solution from the urea tank and maintains a certain pressure, then delivers it to the injection unit to meet the flow and pressure requirements of the injection metering system. When supplying liquid to the urea injection system, the motor drives the supply pump to transport the urea solution from the urea tank to the pressure chamber. A portion of the urea solution is used for injection, while another portion returns to the urea tank through the throttle orifice. Structure of the urea pump: The urea pump mainly consists of a motor, supply pump, reverse pump, switch valve, pressure chamber, throttle orifice, etc. The pump has two working states: supply and emptying.
As a seasoned diesel vehicle driver with over a decade of experience, I've encountered urea pump filter clogging issues several times. The filter location varies by vehicle, but it's commonly found near the urea pump, such as under the engine compartment or on one side of the fuel tank. In my experience with Volkswagen or Ford models, the filter is mostly integrated into the pump unit, and you can spot a small filter element by removing the pump cover or protective casing. Whenever it gets clogged, the vehicle triggers an emission fault light, experiences power loss, and consumes more fuel. I've developed a habit of inspecting the filter every 30,000 kilometers, using an air gun to blow away dust buildup, which saves a lot of trouble. If you can't locate it, first check the user manual or go straight to a repair shop—don't delay. Prolonged clogging can damage the entire SCR system, preventing urea injection and causing failure in environmental tests, which could lead to significant losses.
