How do you change fuel sending unit on 2000 gmc Yukon?

Answer 1

Yesterday I did this on a 2000 GMC Sierra, so it is probably about the same. Disconnect the negative battery terminal. When the tank is empty or almost empty you must drop the tank. The EVAP (the EVAP is a plastic box right in front of and against the tank) must be removed (1 bolt 13mm) then unplug the 2 smaller fuel lines from the EVAP and let it hang there.

Unscrew the 3 small bolts holding the fuel fill tube after removing the gas cap. Support the tank and loosen the 2 bolts that hold the tank straps (15mm). It will be easier to remove the tank straps, they slip in a "T" slot. You will need to loosen a vent line and the ground strap also since it is attached to the fill tube.

Disconnect the 2 fuel lines at the front of the tank (where the EVAP box was). Lower the tank and reach the top of the tank and disconnect both electrical connectors. The tank should be able to be removed from the vehicle now, you will need to snake the rubber fill tube out from above the frame and then under the vehicle.

After the tank is out clean all the dirt and debris from around the fuel pump/sending unit then loosen the twist lock and pull the pump/sender/float from the tank.

Swap out the variable resistor by disconnecting the connectors (they have plastic plug/locks). Swap the float to the new sending unit and then reverse the above procedures to re-install.

I was able to do this myself in about 2.5 hours, it would be easier and faster with a lift and a helper. I bought this sender (variable resistor) from EBAY for $26 shipped. If your pump is working okay there is no need to swap the whole pump/sender/float assembly. I think dealership will charge $500-600 for parts and labor to change the whole assembly only.