Avoid any aftermarket fuel pumps,they are junk and do not last.Bosch,Airtex and Carter are 3 to stay away from.Napa's fuel pumps are made by Airtex.Delphi pumps are the best for GMs,any places that sell AC Delco parts,Carquest and the dealer are three places to get a Delphi pump.Also replace the fuel filter,it is part of the warranty on the new fuel pump