Wheres the sending unit for gas guage on 1994 chevy truck?

SOURCE: i have a 2005 chevy silverado 1500 2wd 5.3. my

Check the wire behind the guage.If not tight it will make the hand bounce.

SOURCE: where is oil sending unit on 2005 chevy truck 5.3

rear of engine on top near the firewall

SOURCE: Where is oil sending unit on 2003 Chevy Avalanche

It's at the very back of the block, top-center, under the intake manifold.

SOURCE: 1982 chevy truck with dual gas tanks with guage or tank problems

all you need to do is listen to hear the tank switching valve is working. It will make a soft noise under the rear cab section with the key on with the engine off. zif you do hear it sounding the switch your tank unit for that one tank you try to switch to is a fault. Sorry no illustrated diagrams are on hand, just knowledge

SOURCE: Replaced Fuel Sending unit on 1986 Chevy Truck

Check the ground wire at the wiring harness at the fuel tank. If it has a good connection then check the power wires to the tank. You may have a bad pigtail going to the tank. A replacement harness is available at NAPA.