quick question
 

Hi I have an 02 ss and am planning on replacing my evap purge solenoid. Now do I have to releave the pressure on the fuel lines by taking the gas cap off then take off the solenoid or does it matter?

There's a schrader valve that you can use to relieve the pressure

are you removing your fuel lines to replace the solenoid? if so then yes otherwise idk y you would need to relieve fuel line pressure