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A fuel pump switch? Never heard of one in all these years working on Pontiac since 1872. Gall a GM parts dearler and ask them. They will tell you the same story I just told you. The pump runs off the relay only
The electric fuel pump's operation on that vehicle is triggered by the powertrain control module, activated by a relay (likley located under the hood in the power distribution center, if not check the fire wall and underhood near the fenders) and protected by a fuse (the fuse is likely located in the fuse block that is under the dash, if not it will be under the hood in the power distribution center).
First clarify stock ELECTRIC fuel pump in tank and you say CARBURATOR. If its not EFI , something is not right. Check for a 20A fuel pump fuse, with a 12V test light. IGN ON The oil pressure switch is on the engine block engine type unknown ). It the engine loses oil pressure (i.e. stalls) the fuel pump will shut off. Hope this helps.
yes the fuel pump is in the gas tank but before you change it checkout the fuel pump relay and fuses first there should be a fuel pump relay in the fuse box under the hood and also checkout all of the fuses under dash on the driver side it could even be the fuse to you sending unit