Cressida 1985 Fuel guage no longer gives warning light when tank almost empty. Guage remains on "full" and only strats operating when about 20 litres have been used. Is a wiring diagram available? Have a feeling it may be a faulty earth connection somewhere under the dash.? Thanks Albert

Digital gauge also gets its input for fuel level from a float in the tank. Here the culprit can be that float because the error is systematic i.e., full on empty and empty on full/half. If the reading was erratic then it was something to do with IC in the bars display panel.

u either have a bad level sensor in the tank or the guage is bad. u need to get wiring diagram and find connector for fuel sending unit and jump wires to trick guage into thinking it is full if it still say empty u need instrument cluster if it goes to full it level sensor in the tank

A loose connection on the sending unit could cause the problem but also moisture in the tank in cold weather could also be a factor in which i would add fuel line antifreeze to a full tank of fuel..........Hope this helps you out.

I had a 2001 silverado 2500 h.d. with the same problems. I took it to a gear head and he found that the emergency brake cable was loose causing it to trigger the warning light on the dash. As far as the low fuel guage I took it back to the gear head and he found that the float in the gas tank was broken causing the low fuel light to come on. The float wasnt a big deal until I lost track of mileage and ran the tank dry.

When testing a fuel guage you should disconnect the wires to it,guage should read over full,ground the float wire,turn off key then turn back on should read empty.You have to cycle the key for guage to move.If still inop the wire is broken in the harness between the tank and the dash.Voltage on the float wire is low.When tested with a test light it will barely light the light and pulsate.This test indicates the wiring is good.

sounds like fuel pump is good the floater may need replacing or the wire that reads the floater may be loose

or sending unit is worn or faulty

Hi
We have the same truck that does the same thing.
The fuel sender in tank is faulty. It is in your gas tank. Common chevrolet problem.

It sounds like problem with either gage or sender unit in fuel tank.
What warning massage from computer.

you can check to see if your guage is getting electricity to it with a test light first and foremost, and then use a wire to directly give it electricity without it being connected to the harness itself and see if it moves too, if it moves with giving it electricity then it's not the guage itself... then check the wires at the tank to see if the harness is getting electricity there. if it is and the guage isn't moving when you wiggle the harness, drop the tank and replace the assembly as a unit that goes inside the tank that has the float attached that makes the guage work.