Eli5: Why do Diesel engines have a return line back to the diesel storage tank?

Question

Eli5: Why do Diesel engines have a return line back to the diesel storage tank?

In: 0

Answer 1

For older diesels with purely mechanical injectors the moving parts in the injector are lubricated by diesel that then flows back to the tank via the return line. You are unlikely to find such a design in a remotely modern car though.