I know that Ricardo spent a lot of time on this already much appreciation, but I still need help.

This is a short clip of how the fuel gauge works. The tank is almost full. The needle goes up to full then goes down to almost half. When it's almost empty it stay on the mark for a few seconds the goes up to quarter.

Fuel guage.mp4

As I've said many times, the fuel gauge issues have a common cause: poor quality of the PCB. Copper tracks are very thin and they crack from vibration, corrosion, etc. Critical areas are:

• around yellow connector
• around fuel gauge connections

As a rule of thumb, the more mass a component has, the more prone to cracking the copper tracks are. Same goes for solder joints.

It seems you've had advice on this before. What have you checked? What have you done?

Does the sender react to different levels of fuel? Do the power and ground wires show any shorts or drops? Are there any of the problems RicardoM has mentioned? Does the gauge react to direct application of voltage, be it through the circuit or at the gauge itself?

 

On a note of curiosity about the specific symptom. I wonder how much the heat of a damaged, warming circuit would affect the resistance of the whole circuit. Considering that, as conductors warm up their resistance increases. Could this have some effect on a failing circuit with an area of less conductor material than expected?

Thanks guys for your prompt input.  I have checked for cracked solder joints and did find some.  I did not check for any damaged copper tracks. Will do over the weekend.  I forgot to mention that  my clock and fuel dash lights are not working. Please bare with me on this.

Cheers

21 minutes ago, spoil_kid123 said:

Thanks guys for your prompt input.  I have checked for cracked solder joints and did find some.  I did not check for any damaged copper tracks. Will do over the weekend.  I forgot to mention that  my clock and fuel dash lights are not working. Please bare with me on this.

Cheers

Take your time

Check out those tracks, joints and bulbs, they could explain all your issues or none of them. As the former are common problems it's not much effort to investigate.

If that yields nothing, it's time to move on to the rest of the circuit(s).