Where is the fuel pump reset switch located on a 1999 gmc sierra pickup?

There is no fuel pump reset switch on a 1999 GMC Sierra (or virtually any modern vehicle). Fuel pumps are controlled by the engine computer and don't have a manual reset button. If you're experiencing fuel pump issues, the problem lies elsewhere and requires professional diagnosis. Possible issues include:

* Faulty fuel pump: This is the most common cause.

* Fuel pump relay: A malfunctioning relay can prevent the pump from operating.

* Clogged fuel filter: A restricted fuel filter can starve the engine of fuel.

* Wiring problems: Damaged or corroded wiring can interrupt the power supply to the pump.

* Engine control module (ECM) issue: A problem with the computer itself could be preventing the pump from engaging.

If your GMC Sierra isn't starting or running properly, you'll need to have it checked by a mechanic or auto electrician to diagnose the specific problem. Attempting to "reset" something that doesn't exist could waste your time and potentially cause further damage.