Does the 2012 impala have the same access panel to the fuel pump in the trunk or under the seat as the earlier years? Or does the tank absolutely have to be dropped?
If your model Impala is a LS, which I believe this applies to all models that year, the fuel pump is located in the engine compartment on the drivers side closest for the radiator end of the block. You can remove the fuel shroud shield on the top and access the fuel tails that need to be removed. You should be able to remove the pulp by removing just a few bolts. You also may be able to locate a repair manual at your local auto parts store that can ensure you have the exact location.
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