Technician A says the gas cap is equipped with a pressure release valve that opens if there is excess vapor pressure in the fuel tank. This prevents tank ballooning. Technician B says the gas cap is equipped with a vacuum relief valve that opens if there is an excessive amount of vacuum in the fuel tank. This prevents tank collapse. Who is correct?

Question

Quizplus · Accepted Answer

Both Technician A and Technician B are correct. The gas cap is designed with both a pressure release valve to prevent tank ballooning from excess vapor pressure and a vacuum relief valve to prevent tank collapse from excessive vacuum.

Technician a Says the Gas Cap Is Equipped with a Pressure