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On any mechanical injected old style diesel, like an 82 Benz 240 or 300, when they get old the break off pressure of the injectors gradually drops off from 1800psi + new to 1500 psi or so depending on age and mileage.
Just shimming or replacing the springs in the injectors and getting the break off pressures near new again will make a huge difference in performance and economy due to better fuel atomization.
regards
mech
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