can the fuel tank pressure sensor be installed without a new fuel pump? on 2001 Oldsmobile Alero

pep boys say i need a new fuel tank pressure sensor but have to buy the fuel pump too. The pressure sensor is sold separately for 35.00 so I dont know why I need a new fuel pump too?

Asked by for the 2001 Oldsmobile Alero
Instructions in the manual say the fuel tank has to be removed to replace the sensor but the three wire sensor may be available separately from the dealer at a fraction of the cost of replacing the whole unit.