What happens if the fuel pressure is not relieved before changing a fuel filter?

When changing a fuel filter, it is crucial to relieve the fuel pressure beforehand to prevent fuel from spraying out. If the pressure is not relieved, the pressurized fuel can burst from the fuel lines or filter connections when they are loosened. This can lead to uncontrolled fuel spray, which not only poses a significant safety hazard but also increases the risk of fire or severe injury. Ensuring that the fuel system is depressurized minimizes these risks and allows for a safer and cleaner replacement process. This safety protocol is vital to maintain a secure working environment while performing maintenance tasks.