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Try cleaning the fitting for the overboost switch where it come out of the intake manifold and make sure you are getting boost to the aneroid control on the fuel pump. Sound like you maybe bumped someting or broke a plastic line. They tend to get brittle with age.
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Mark
82 300SD 110k
91 Caprice SS
92 Jetta TD
97 Cadillac Concours(300hp)
84 Celebrity 4.3L diesel
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