Welcome to AF km26.
WHat year is your grand am ???
Check the fuse and relays first!!!
Then depending on your cars year you could have a bad wire harness to the fuel pump.
I'd try this first then worry about getting to the pump replacement.
With a full tank isnt that hard if you cant get the fuel out.
Use a large board on a floor jack and use that to lower the tank once you loosen the tank straps and multiple fuel lines and vents.
Then you can syphone out the gas if needed.
I've done then and not drained the tank,
but it is nice to have it empty to clean out any crap that's fallen into the tank over the year(s).
Good Luck