During the start sequence, you must turn on the ____________ __________ switches in order to supply fuel to the engines.

• A. Prime pump
• B. Ignition switch
• C. Fuel control switch
• D. Start switch

Answer: (A)

The key idea is that priming is what gets fuel into the engine so it can start. The primer pump is used during the start sequence to push a small amount of fuel from the tanks into the intake or fuel lines, creating a ready-to-burn mixture. This helps overcome fuel line vapor, delays, or any initial fuel starvation, making ignition possible. Once the engine fires and runs, the primer is turned off (or its function ends) and the engine draws fuel through the normal system.

The other switches don’t deliver fuel for starting: the ignition switch provides spark; the start switch energizes the starter to spin the engine; and the fuel control switch regulates fuel flow during normal operation, not the initial priming needed to start.