Could be a ground. Follow ground lead and assure connection to body is
clean and tight. For the ultimate ground, replace screw with a stainless
steel one, and paint over tightened connection to prevent
corrosion damage. Factory skimps and assumes as far as grounds go. Adding a
cable from engine block to frame is also a good idea.
We have had issues with Shell gasoline causing problems with
fuel gauge sending units. But from what I've gathered, this
was supposed be a localized problem in Alberta. Nevertheless,
we still are replacing lots of sending units. No recall on it that
I'm aware of, but if you are just out of warranty, you might want
to sit down with your local dealership service manager and
politely see if he can do anything to help you. "Goodwill"
warranty is alive and well.
The very first thing that I would do would be to crawl under the LS of the
vehicle, and unplug the fuel sender connector where it passes through the
floorboard. You will likely find that it is full of water, and that is
causing your problem. Dry it out with compressed air and apply some
dielectric grease before reconnecting, and you ought to be good to go.
If that doesn't fix it, then a new fuel level sensor will. That requires
fuel tank removal, and is probably best left for your dealer to take car of.
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