What is the reason for the continuous exhaust of the urea pump?
4 Answers
The continuous exhaust of the urea pump is mainly due to the blockage of the filter screen, which reduces the suction capacity of the urea pump and the ability to treat exhaust gases. Therefore, it is recommended to replace it. The urea pump is gas-assisted, and if the urea pump does not spray gas, it usually means it is not spraying the urea solution. This is a very common phenomenon, mainly caused by urea pump crystallization or blockage of the air solenoid valve. The reasons for severe car shaking and inability to accelerate are as follows: 1. Dirty air filter: The air filter is designed to protect the engine and reduce wear, generally requiring replacement every 10,000 kilometers. If not replaced in time, insufficient air intake can cause low idle speed and engine shaking. Simply replacing the filter can solve the problem. 2. Broken high-voltage line: A broken high-voltage line refers to the breakage of the wire core, which can affect ignition and cause engine shaking. Use a multimeter to measure the resistance and replace the one with significantly higher resistance. 3. Spark plug lifespan: Spark plugs have a lifespan. After 30,000 to 40,000 kilometers, their ignition efficiency significantly decreases, which can affect ignition. This is the most common fault, and replacing all the spark plugs can resolve the issue.
Last year when I was driving a diesel car, I encountered the issue of the urea pump continuously venting, which was really stressful at the time. Usually, this could be due to air entering the urea system, such as from aging pipes or loose connections causing leaks. Additionally, pump failures are also common, like stuck internal valves or damaged diaphragms, which can cause unstable urea pressure and continuous venting. Another possibility is poor-quality urea solution, leading to crystallization that clogs the system's pipes or nozzles, forcing the pump to constantly vent to relieve pressure. I recommend first checking the vehicle's dashboard for any fault codes, as sometimes it's just a sensor misreporting. If the venting doesn't stop, the car's emissions may not meet standards, and fuel consumption could increase, so it's best to promptly visit a professional repair shop for a thorough inspection. Don't overlook this small issue—it not only affects the environment but also makes driving uneasy. Always use genuine urea and perform regular maintenance to avoid similar troubles.
As an ordinary car owner, the constant venting of the urea pump is indeed frustrating. There are many possible reasons for this. It could be a system design issue, such as the installation position of the urea pump allowing air bubbles to enter. It might also be that the urea tank wasn't sealed properly, letting air seep in. Another common cause is a faulty pump control unit sending wrong signals that keep the pump venting. If venting happens too frequently, the car's warning light may come on, acceleration may weaken, and fuel consumption may increase. I experienced this myself once—later, a mechanic used a diagnostic tool and found a leak at a pipe connection. My advice: don't try to fix it yourself blindly. First, get it checked at a 4S shop to see if it's a minor issue. Don't underestimate this problem—continuous venting wastes urea and causes pollution. Repair costs are usually not high, so fixing it early ensures peace of mind while driving.
When I first got into car modifications, I encountered a situation where the urea pump kept venting, which is quite common. Common causes include an overloaded urea pump, such as using unqualified solution or diluted mixture, leading to crystallization that blocks the system. Residual air inside the system or low temperatures reducing pump efficiency can also cause venting. I recommend letting the system self-check for a few minutes after starting the car. If the venting is minimal, it might be normal, but if it persists, it's time for a check-up. Avoid parking in low-temperature environments for extended periods. For a simple fix, you can try emptying the urea tank and refilling it with fresh solution, but avoid forcing any operations to prevent damaging the emission control system.
