Introducing the wrong fuel into a vehicle, specifically adding petrol to a diesel engine, initiates a cascade of potentially damaging effects. The primary issue stems from the differing properties of the fuels. Petrol, designed for spark ignition, possesses a lower viscosity and lubrication capability compared to diesel, which relies on compression ignition and inherent lubricity. The presence of petrol compromises the diesel fuel’s ability to properly lubricate the high-pressure fuel pump and injectors, leading to increased friction and accelerated wear.
The ramifications of this misfueling event are substantial. The reduced lubrication can quickly cause seizing or premature failure of critical fuel system components. Furthermore, petrol’s lower flash point can disrupt the controlled combustion process within the diesel engine, resulting in knocking, misfires, and a significant reduction in power output. Over time, internal engine damage, such as scored cylinder walls or damaged pistons, can occur, necessitating costly repairs or even complete engine replacement. Historically, this type of error was more prevalent due to nozzle size similarities; modern designs aim to mitigate the risk with size discrepancies, but vigilance remains essential.
