Th fuel relay in most situations will be under the hood in the fuse box. It will be black and square with numbers on the top of it. Often the numbers on other relays such as your horn will be able to be put in the place of your fuel relay to determine if it is truly the relay that went out.
The fuel pump relay switch looks like the normal electric switch. The function of fuel pump relay switch is turn the fuel pump on.
Most are cubical in shape.
http://www.partsamerica.com/ProductList.aspx?parttype=493&ptset=A&searchfor=Fuel+Pump+Relay
It does not have a fuel pump switch. It has a relay and a fuse for the fuel pump.
you look in the relay box
the fuel pump relay is located behind the battery.There should be 2 relays, they look alike, but if you look closely it has fuel pump relay on the top.
Swap the fuel pump relay with another like relay.
that doesn't sound like the fuel pump relay...sounds like the fuel filter. look on the cross member immediately in front of the fuel tank
Black square near a second relay (for AC), under the bonnet , firewall passenger side.
usually a small black box on the firewall (back of engine compartment)
Swap the relay with another like relay.
Swap the fuel pump relay with another like relay in the fuse/relay center. If the problem with the fuel pump goes away, the relay was bad. If not, knowing GM fuel pumps, the fuel pump is the problem.