How do you remove a Chevy blazer filler neck?

Remove all fasteners behind the filler neck door that attach the upper filler neck assembly to the car body. Remove ground strap if applicable. Loosen and slide clamps up from tank end of filler neck then wiggle the filler hose assembly off the tank and out. Take care not to allow dirt and crud to enter the tank. Removing the clamp on the tank end of the filler neck assembly will be a test of your dexterity skills but it can be done.