What happens if the metal nozzle is not in contact with the vehicle's filler neck during refueling?

When the metal nozzle is not in contact with the vehicle's filler neck during refueling, it can lead to an increase in the risk of static electricity build-up. This is particularly concerning because static electricity can accumulate due to the movement of fuel, which generates friction. If the metal nozzle is properly grounded by being in contact with the filler neck, it can help dissipate any static charges safely. Without this grounding effect, there is a higher chance that static electricity could discharge as a spark, posing a fire hazard in the vicinity of flammable fuel vapors. Thus, ensuring that the metal nozzle maintains contact with the vehicle's filler neck is important for safety during the refueling process.