Ford Maverick opened the fuel tank cover to inhale black smoke in Songshan Lake Music Fountain Square due to the failure of fuel tank ventilation system and insufficient engine combustion.

1. Car oil circuit is blocked: If the car oil circuit is blocked and the oil cannot flow, it will cause excessive pressure and heat in the oil tank, which will lead to black smoke.

2. Fault in the ventilation system of the oil tank: The air in the oil tank needs to circulate through the ventilation system. If the ventilation system fails, it will cause excessive pressure and heat in the oil tank, which will lead to black smoke.

3. Insufficient engine combustion: If the engine is not fully burned, the exhaust gas generated by combustion may be incomplete, which may lead to the phenomenon of black smoke.