Can coolant get in the fuel system of a diesel engine?

Yes, coolant can enter the fuel system of a diesel engine, though it is uncommon. This typically occurs due to a failure in the engine's head gasket, fuel cooler, or a cracked engine block, allowing coolant to leak into the fuel lines. Such contamination can lead to severe engine damage, including fuel system malfunction and poor combustion. If coolant contamination is suspected, it's crucial to diagnose and repair the issue promptly.