Where doest the wire come from that energizes fuel pump relay on a 1989 Suburban TBI?

The wire that energizes the fuel pump relay on a 1989 Suburban TBI comes from the ignition switch. More specifically, it's a wire that's only hot when the ignition key is in the "ON" or "START" position. This wire provides the power needed to activate the relay, which in turn sends power to the fuel pump.

It's important to note that it's not a single, direct wire, but part of a circuit. You won't find a single wire labeled "fuel pump relay power". Tracing it will require a wiring diagram specific to your 1989 Suburban's year and engine (the TBI system was used on various engines). A Chilton's or Haynes repair manual for your vehicle would be invaluable for this. The diagram will show you the correct wire color and its path from the ignition switch to the relay.