If your has it it is in line with the fuel pump.
At 56-60 psi fuel pressure GM put it there to help dampen the pulses of fuel comming out of the pump.
It is located on the fuel pump out let line in the fuel tank.
I cant remember what year that started in but I think it was 94 or 96.
If you had your pump out you would see it if your had 1. The outside shell was black and the inner rubber was orange