Since there is no ignition event, there would be no explosion. Although a bullet might be very hot for a few moments after it is fired (due to the friction and the explosion that propelled it in the first place), its temperature would be far too low to ignite anything.

Does a flamethrower kill you instantly?

Contrary to what we've seen in the movies, the weapon designed to clear the enemy out hard-to-reach areas, like bunkers, caves, and tunnels. By burning up the oxygen in the area, the flamethrower quickly knocked the enemy out of the fight. It was designed primarily to incapacitate, not kill.

How long does it take to die by flamethrower?

According to retired Marine Willie Woody, the average life expectancy of a flamethrower trooper on the battlefield was five minutes. Since the fuel tanks weren't constructed of bulletproof materials, the tanks just made bigger targets. If struck by a hot round in the right spot, the result could be a massive explosion.