How to solve the slight steam leakage reported by the commander's car

The commander's car reported a slight steam leak, which can be solved in the following ways:

First, you can remove the plastic hose of the vacuum pump on the activated carbon tank, and then check whether there are any common faults in the relay. If the relay has common faults, please remove and replace the relay.

The harm caused by the leakage of the exhaust system makes it difficult to start the automobile engine when it is not idling or idling, and the exhaust pipe emits black smoke: when the filter device at the air inlet below the activated carbon tank is blocked by dust and residue, the gasoline and diesel vapor filtered by the activated carbon can be saturated into gasoline and diesel liquid, and then enter the cylinder according to the air outlet above the electronic throttle valve, resulting in excessive mixture.

Exhaust emission exceeds the standard, and fuel consumption increases: under the normal operation of EVAP, if the gas passage at the lower end of the activated carbon tank is blocked, the intake passage of the automobile engine can't normally suck in fresh air, and at the same time, the gasoline and diesel vapor adsorbed in the activated carbon tank can't be taken away immediately, and the gas can only enter through the bypass valve of the oil cover, which makes the oil in the automobile fuel tank in a negative pressure state, which increases the volatilization rate of the gasoline in the automobile fuel tank.