1994 bonneville ssei fuel pump problems

hi there i got a 1994 pontiac bonneviile 3.8 s/c it was parked for two years try to stated but didnt turn on so i disconnected the fuel lines connected to the injectors try to started and fuel didnt come out so i was thinking that my fuel pump didnt work i put new gas in it and nothing so if somebody can tell me how to change my fuel pump out do i need to take the whole tank out or is should i just take the back seat off please i need help thank you

Welcome to AF, the gas is dead after 2 years, Check for fuel pressure at the rail, if ok, spray carb cleaner into the intake see if it kicks, can't just expect to cold start a car that sat 2 years.