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Diesels have no manifold vacuum as gas engines do. That is because they have no throttle plate (atleast not since the 76 240D).
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Will a turbo diesel produce some vacuum when the turbo is spinning? It seems like it would?
Also, as fas as I can tell, a gas engine is given air when you put your foot on the gas, and the amount of fuel necessary is then added (metered). With a diesel, your foot sends the engine fuel. Is this (basic) description correct?
And finally, exactly why does a diesel engine produce no vacuum?