What must be shut off when filling RVs to eliminate all ignition sources?

When filling recreational vehicles (RVs) with propane, it is critical to eliminate all ignition sources to ensure safety during the dispensing process. The correct answer is that appliance pilots and ignition systems must be shut off.

This is vital because the ignition sources, such as pilot lights and electronic ignition systems, pose a significant risk of igniting any escaping propane gas during the filling process. Propane is highly flammable, and even a small spark from an appliance can lead to a dangerous situation.

While shutting off the main engine and power connections are good safety practices, they do not specifically address the immediate risks associated with the propane filling process. Appliances that are on and have live ignition sources can ignite fuel vapors, which is why they must be turned off. Therefore, ensuring that all appliance pilots and ignition systems are disabled creates a safer environment for filling the RV with propane.