usually not with regular ammunition. Military target range example will use machine gun firing mix of incenderary, tracer, hard ball, 15 to 30 rounds on regular vehicle gas tank targeted will get a fire going, sometimes violent Whoosh but rarely explosion as seen on TV, Movies. 60 minutes TV demonstratin of Chevy Pickups blowing up when hit from side was false, GM sued and TV spokesman had to apoligize on air , broadcast the Ohio Fire Marshall report and the libel suit evidence found in salvage yard- was high power model rockets attached to tank with radio trigger, 2 scenes not aired were bad timed but footage was archived, ordered seen by court- explosion of vehicle happened obviously way before side impact vehicle had hit. Since the TV show was doing a pyrotechnic 'stunt' on a race track that was also used public events the fire marshalls office had to be there , record cleanup efforts, disposal to licensed by state salvage yard--and that meant state employee report was 'open record" with info of rocket used , salvage yard address. SO, movies use pyrotechnic/flaming and explosive charges on the sacrificed vehicles, timers and remote triggers, police will use M14 or old BAR Road Blocker with military ammo a few times for real, more often on firing range and will let burnout awhile, fire dept practice vehicle fire response and foamite extinguisher use. Gasoline vapors can 'explode' at low rate, blow out gasoline tanks or gas cans to get nasty burns- dangerous and especially with some dried weeds on shoulders, car with flat tire pulled over so catylitic convertor causes fire.