Why does the Chery New A3 still have negative pressure after replacing the fuel tank cap?

1 Answers
VanPresley
07/30/25 1:28am
The reasons why the Chery New A3 still has negative pressure after replacing the fuel tank cap are detailed below: The pressure inside the fuel tank is lower than the external pressure: The negative pressure in the fuel tank is generated when the control valve opens and the fuel pump draws fuel, reducing the fuel volume. Excessive negative pressure warning: However, excessive negative pressure is also a sign of malfunction. The fuel tank not only has an EVAP system but also a breather valve, which opens to compensate for the pressure inside the tank when there is excessive negative pressure, preventing the tank from being sucked in. If this valve fails, the negative pressure in the fuel tank can become very high, making it difficult to even remove the fuel tank cap. If this phenomenon occurs, it should be addressed immediately.
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