Where is the fuel pump relay on a 2500 gmc 1990 vandura?

In a 1990 GMC Vandura 2500, the fuel pump relay is typically located in the fuse box under the dashboard on the driver's side. It may also be found in the engine compartment near the battery, depending on the specific wiring and options of the vehicle. Always refer to the vehicle's service manual for the exact location and diagram.