A generic answer without a lot of details........
Gas engines have to generate a vacuum in order to overcome the throttle of the intake. This determines their air/ fuel mixture.
Diesels generate little to no vacuum in their intake, if fact, most of the time there is pressure. They use as much air as you can pump into them. That is what makes them a more efficient design.
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Sam
84 300SD 350K+ miles ( Blue Belle )
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