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?

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Answer 1

Some gasoline cars do as well. This is typically with direct injection engines which use a common rail injection system, where there is a very high pressure line that feeds off to individual injectors in each cylinder. Because the pressure is so high, you couldn’t run without a return line or else you would end up burning out the fuel pump pretty quickly.