A dude got 50% off his car after his trunk basically exploded while filling up at a gas station. Surveillance footage from Brazil captured the moment half of his car disappeared in a split second. Allegedly, the Volkswagen was fitting with an illegal propane gas tank that was not compatible with the natural gas tank that the car was running on.
The reddit user u/MasterFubar breaks down exactly what he thinks caused the crazy explosion:
The natural gas tank was legal, the propane tank was not.
Propane is subsidized in Brazil, because it's used for cooking. Some people who have natural gas tanks fit a propane tank in parallel, so they can switch to cheaper propane while driving.
The problem is that propane liquefies under pressure, while natural gas does not. This means propane tanks actually hold liquefied propane at a relatively low pressure, while natural gas tanks are much stronger and hold gas at a much higher pressure. The driver forgot to close the valve between the two gas lines as he filled up, so the high pressure natural gas went into the propane tank and blew it up.