fuel pump replacement on 1997 GMC 1500 Pickup

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
how is the "cam ring retainer" removed to acces the fuel pump for replacemetnt.
is it just twist and turn or is there a tool that is needed.
(1) Answer
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I'm sure GM have a special tool but I have always used a screw driver and tap the ring counter clockwise to remove it. On reassemble ensure the sealing gasket/O Ring is properly installed or it will result in a Evaporative Emission failure.