http://wiki.answers.com/Q/Where_is_the_smog_pump_0n_a_2000_chevy"
You PUSH IT!!
It depends on weather its 4x4 or 2 wheel drive there are 8 0n 4x4 and 6 on 2 wheel drive
Mounted on top and inside the fuel tank.
0n a 2007 it it 0.44
Passenger side lower front bottom corner.
Directly beneath the power steering pump on the passenger side of the engine.
it is on fuse-relay box (0n drivers side).it is number 409.
looking down from (ONTOP) of the engine they are behind the water pump
First they would have to make a 4.3 V-8 I think the small V-8 is a 4.6L
the pump is often located behind the plastic on the front passenger wheel well. when you fold back that plastic you will see the pump on the side of the windshield washer container.
They are junk, simple as that. I have one to change on Monday.
0n v6 engines and 2.2 four cylinder engines,the sending unit is next to oil filter.