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What would make check engine light come back on a week after fuel pump replaced? on 2005 Chevrolet Uplander

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Mechanic ran diagnostic and concluded check engine light was caused by faulty fuel pump and sensor, replaced and after a week the light has come back on.
(1) Answer
(1) Comments
there is no code for the fuel pump. there is one for circuit issue but not the pump. a code never identifies a bad part, just a failed system.

get it re checked and correctly diaged.

Roy