What will prevent the ignition of gasoline fumes if the engine backfires?

To prevent the ignition of gasoline fumes during an engine backfire, several measures can be implemented. These include ensuring the engine is properly tuned and maintained to minimize backfire occurrences, using a well-designed exhaust system that reduces the chances of flames reaching the fuel vapors, and employing flame arrestors in the intake and exhaust systems. Additionally, proper ventilation in areas where gasoline is used can help disperse fumes and decrease the risk of ignition.