How do you depressurise a high fuel system?

To depressurize a high fuel system, first, ensure the engine is turned off and cool. Locate the fuel pump relay or fuse and remove it to prevent the pump from activating. Then, carefully relieve the pressure by loosening the fuel filler cap to allow air in, followed by disconnecting the fuel line at the fuel rail or injector, using a rag to catch any spilled fuel. Always follow safety protocols and consult the vehicle’s service manual for specific procedures.