How Do You Replace A Fuel Sending Unit In A GMC Sonoma?
The fuel-sending unit on your GMC Sonoma is located inside the fuel tank. This unit is equipped with an arm that extends down into the tank and connects, through a variable resistor, with the fuel gauge on your instrument panel. In many cases, problems with the variable resistor makes replacement of the sending unit necessary. Open the glove box compartment and locate the fuel pump relay behind the plastic cover in the upper left corner. This applies to 1995-97 2.2L engine models. For any other model go to step 5. Unplug the relay on the far left. Start the engine until it stalls. Disconnect the black, negative battery cable. Then go to the next section. Locate the Schrader valve on the inline of the fuel rail, right before the first fuel injector. The valve is similar to an air valve on a bicycle tire. Cover the valve with a shop rag to catch the squirt of fuel as you depress the stem inside the valve with a small screwdriver. Remove the black, negative battery cable. Loosen the fuel
