follow up qustion.would defective calpak computer chip shut down fuel pump?
fuel pump is new. ecm is new rebuilt calpak is from old ecm 1990 CADILLAC SEDAN DEVILLE
i believe you can look into this, find your fuel pump relay and see if its getting energized from the pcm, if it is then your problem is the relay or after it. can also try the green fuel pump priming connector, put 12v to it and see if pump runs
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