When filling RV's the service valve on the tank and ___________________________ should be shut off to eliminate all ignition sources

• A. the battery and alternator
• B. appliance pilots and ignition system
• C. the exhaust system
• D. the fuel line valve

Answer: (B)

Propane safety hinges on removing any possible flame or spark near the fill area. When you’re filling an RV’s propane tank, shutting off the service valve on the tank is essential, and you must also turn off all appliance pilots and the ignition system. Those pilots and ignition devices are direct sources of flame or sparks that could ignite leaking propane, so silencing them minimizes the risk of ignition during the fill. The other options don’t address this immediate ignition-source risk: a battery/alternator is part of the electrical system but isn’t as targeted to preventing ignition from propane leaks; the exhaust system isn’t an ignition source; and the fuel line valve alone stops gas flow but doesn’t remove potential sparks from pilots or igniters.