It does not have one. Check the fuel pump relay and fuse first. Chevy had wiring problems at the fuel pump sending unit connector on the top of the fuel tank. CHECK IT. It may just have a bad pump too.
There are several things that needs to be done for a tune up on a 1996 Chevrolet Suburban. Some things that need to be done are an oil change, replacing spark plugs and plug wires, and a new distributor cap, rotor, PCV valve, air and fuel filters.