Final answer:
When manually gauging a tank, the fuel-finding paste should be applied to the steel tape at the level where the fuel is expected to be. By applying the paste at the expected fuel level, you can easily identify the amount of fuel in the tank.
Step-by-step explanation:
When manually gauging a tank, the fuel-finding paste should be applied to the steel tape at the level where the fuel is expected to be. The paste is a specialized substance that changes color when it comes in contact with fuel, allowing you to visually determine the fuel level on the tape. By applying the paste at the expected fuel level, you can easily identify the amount of fuel in the tank.