One of the issues with modern diesel engines is the huge fuel pressure in the piping of the engine bay.
2,000 BAR – 29,000 PSI
"Common rail direct fuel injection is a direct fuel injection system for petrol and diesel engines. On diesel engines, it features a high-pressure (
2,000 BAR – 29,000 PSI) fuel rail feeding individual solenoid valves, as opposed to a low-pressure fuel pump feeding unit injectors or pump nozzles"
Not only will this propel diesel through body parts, likely to induce the need for long periods of surgery or even amputations, the pressure will find *all and any* weakness due to age, rust, vibration / pulsation induced cracking of lines and fittings, or simply due to people having worked on them incorrectly. Once these systems spring a leak that ignites you have a superb flame thrower running under the bonnet. (HINT: Think carefully before lifting the bonnet with your Halfords fire extinguisher in hand, it might be wise not to look....) For sure, shut down the engine at the ignition switch first. DO NOT open the bonnet if the engine's still running and generating fuel pressure from its usually mechanically driven high pressure pump!! Modern tech ehh?