Need to change fuel pump for 99 chevy blazer how do i do it and where is the fuel pump located

Pump is in fuel tank need to drop the tank to replace ur working under the truck need to drain tank jack and support vehicle dissconnect the vent/filler tube connections support the tank and unbolt tank support straps slowly lower tank disconnect the fuel lines and elect connections than drop tank all the way down on top of tank will see ring pry up on lock ring and slowly using a brass or non conductive drift pin turn lock to remove fuel pump remove -install and replace is reverse

First you need to relive the fule system of pressure. do this by finding your fule pump relay disconecting it and start the car. it will sputer, this is reliveing fule pressure.once it stops sputering your ready to get the fule pump out. it is located in the fule tank. the tank is held on by 2 straps your going to have to take off. once you do that drop the tank and the pump will be on top of it.