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one of my friends C5 Vett is having problem with the fuel gauge it reads full but then it will go down and then later it goes back up and so on what might the problem be please help thanks
Typical actually, try throwing in a bottle of Techtron from Autozone or some other automotive store. Then only buy Top Tier fuels (see toptier.com for who they are in your area. Hopefully this will clear it up.
You have the sulphur on the sending unit problem. Probably in the right tank. Use the large 20oz bottle of Techron and do it a few more times. Should HELP but not entirely fix the problem. And use Chevron or Texaco gas that have Techron in it. Seafoam in the TANK may also help. Just do ONE at a TIME. BIGHANK