Answer:
Both Technician A and Technician B are correct. When working with fuel, it is important to take the appropriate safety precautions to prevent the fuel vapors from igniting. This includes working in a well-ventilated area, away from any open flames or sparks. However, even in a well-ventilated area, there is still the risk of the fuel vapors igniting if they are exposed to an open flame or spark.
To minimize the risk of fire or explosion, Technician B suggests working in a tightly closed shop. By working in a tightly closed shop, the fuel vapors are less likely to escape and ignite, reducing the risk of fire or explosion.
In conclusion, it is important to follow both Technician A's and Technician B's advice when working with fuel. By taking appropriate safety precautions and working in a tightly closed shop, the risk of fire or explosion can be greatly reduced.