What is the reason for the non-working purge pump in the new three-cylinder Excelle?
2 Answers
New three-cylinder Excelle purge pump not working is caused by purge pump failure. Control gas concentration: The main function of the carbon canister purge pump is to blow fuel vapor from the carbon canister into the intake pipe and control the concentration of the combustible mixture. Damage to the purge pump will prevent fuel vapor in the carbon canister from entering the cylinder, causing the engine's combustible mixture concentration to decrease, thereby affecting the vehicle's power output. Purge pump damage: If the carbon canister is filled with fuel vapor but the purge pump fails to blow it out, this will affect the recycling of subsequent fuel vapor, naturally leading to increased vehicle fuel consumption. If the purge pump is damaged, fuel vapor will be directly discharged into the atmosphere (since the carbon canister is already full at this point), and a noticeable gasoline smell can be detected in the vehicle's exhaust.
The purge pump is a component in the emission system that handles fuel tank vapor to ensure compliance with emission standards and engine efficiency. I've driven many car models, including this Excelle three-cylinder, and encountered similar issues. The most common causes are: a blown fuse, especially check the position marked "Purge" in the fuse box; poor wire contact or short circuit, leading to signal transmission interruption; damage to the pump motor itself or seized bearings; ECU control failure, where the signal fails to trigger the pump activation. The dashboard will illuminate a warning light to indicate the issue. During inspection, first check if the fuse is intact—if not, simply replace it; otherwise, professional diagnostic tools are needed to scan for fault codes and check for voltage abnormalities. Don't ignore this problem, as it can increase exhaust pollution, affect annual inspections, and fuel consumption. It's recommended to schedule a comprehensive inspection at a 4S shop—technicians can use a multimeter to identify the root cause. Personal lesson: during regular maintenance, have them check these electrical components to avoid major troubles.
