Today I had my fuel gauge go from 1/2 tank to "E" instantly, and stay there, while accelrating moderately. I had heard about this problem, so I stopped at a gas station, and added 5 gals. of premium 93 octane Citgo gas (to change up from my usual Sunoco Ultra 94). Restarted the car, and gauge worked fine. Stopped at a different Sunoco station that I've never used before, to top off with Ultra and further mix the gas.


Question for those having the erratic fuel gauge reading:

According to the GM Bulletin below, it seems that no sensor replacement is needed. Has anyone had this PCM reporgramming done? What does it change, aside from the fuel sensor?


Erratic Fuel Gauge Reading (Reprogram the PCM) #02-06-04-010

Erratic Fuel Gauge Reading (Reprogram the PCM)
2002 Chevrolet Corvette

Condition
Some owners may comment about the fuel gauge intermittently indicating an empty reading and then return to the correct fuel level indication.

Cause
This condition may result when fuel blends containing aggressive sulphur compounds react with the fuel sender assembly, which may result in voltage spikes being induced on the fuel level signal to the PCM. Use of another fuel blend may reverse this reaction and return the system to normal operation.

Correction
Reprogram the PCM with the new service calibration which is available in the January 2002, Techline TIS 2000 release. Use the TIS 01/2002 or later data update.