What is the reason for insufficient speed of the P1467 purge pump?

[McBeckett]

Purge pump failure may be caused by issues with the charcoal canister solenoid valve. Below is relevant information about purge pump failure: Impact of purge pump failure: Fuel vapor emissions are directly released into the atmosphere, causing air pollution. During normal engine operation, the engine may inhale pure air instead of fuel vapor, resulting in an overly lean air-fuel mixture. If the pump fails in a stuck or constantly open position, it can lead to excessive engine fuel consumption. Symptoms of failure: Difficulty starting the engine, and it is very prone to stalling. Frequent need for a second attempt to start, and the engine is very likely to stall again after starting. There may be unusual noises while driving the car. Specific symptoms include hearing a "clicking" sound sometimes when the engine is not idling. Increased fuel consumption, and a strong gasoline smell inside the car. The engine idle speed fluctuates irregularly, and there is a lack of power during acceleration. After the engine starts, the idle speed fluctuates rhythmically, and the vehicle lacks power during acceleration.