My 2002 is a 2.2L and the Water Pump is on the (standing in front of the car looking aft-towards the back) left hand side. Locate the Serpinetine Belt and it's right underneath and just aft of the alternator pulley.
Off the water pump
yes
in the gas tank, inside the sending unit.
GM vehicles do not use inertia/reset switches.
I'd guess 4 hours of labor would about cover the job. It's worth it.
Pay a mechanic to replace it
under the hood right next to air filter
1.5 hr
Take it out and put a new one in!
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