* In the fuel tank: This is the most common location for modern Chevy 1500 trucks (generally from the mid-1980s onward). It's submerged in the fuel tank and inaccessible without dropping the tank.
* Mounted on the frame: Older Chevy 1500 trucks might have the fuel pump mounted on the frame rail, typically near the fuel tank. This is less common in modern vehicles.
To know for sure, you need to specify the year and model of your Chevy 1500. Once you provide that information, a more precise answer can be given. You can also consult your owner's manual or a repair manual specific to your truck's year and model.
