Looking at the engine from the front of the truck it is in a plastic distribution box directly behind the battery. The cover simply pops off and inside the cover is a list of the fuses and relays. In a pinch there are two more relays of the same type as the start relay that you could substitute until you can purchase a replacement. I bought mine as O'Reilly's autoparts for less than $15.00.
where is the fuel pump reset button or relay switch located on a gmc sierra 2003 and how do i get to it?
There is none.
That would be inside the polar control unit
The 2003 GMC Sierra-2500HD has 16 valves.
The 2003 GMC Sierra-1500 has a V6 engine.
The 2003 GMC Sierra-2500HD has a V8 engine.
The 2003 GMC Sierra-1500 has 12 valves.
The 2003 GMC Sierra-1500 is a gas-powered vehicle.
The 2003 GMC Sierra-2500HD is a gas-powered vehicle.
The 2003 GMC Sierra-1500 has overhead valves (OHV).
The 2003 GMC Sierra-2500HD has overhead valves (OHV).
The 2003 GMC Sierra-1500 has a 5-speed manual.