What should you do if the engine does not start after an attempted start with a ground fire?

The correct approach in the event of a ground fire after an unsuccessful engine start is to vacate the aircraft and call for help. This response is in line with safety protocols for handling potential fire hazards. Continuing to crank the engine, as suggested in your answer, can actually exacerbate the situation by introducing more fuel into the engine, which might worsen the fire or cause an explosion.

Vacating the aircraft prioritizes personal safety and ensures that you're at a safe distance from the potential fire. Calling for help allows trained personnel to handle the situation appropriately, using the proper fire suppression methods such as a fire extinguisher designed for aircraft fires.

In this scenario, shutting off all electrical devices is a wise step to take in preventing further ignition sources, but it should follow vacating the aircraft quickly to guarantee safety. Using an external fire extinguisher is also important but is generally handled by trained personnel rather than the pilot attempting to manage the situation themselves.