gas guage problem!
Instructor
Joined: Apr 2003
Posts: 236
Likes: 0
From: Houston Texas
Alot of members have had this problem including myself. If you have a chevron where you live start using it because it has Techron. If not just buy a bottle of Techron and it should clear the problem right up. Many think that sulfites from lesser grade gasoline collect on the sending unit and interfere with the signal. 
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
Originally Posted by cnusa
hello new here. have a 98 and the gas gauge is going from full to empty and back to full again. any ideas thanks
This happened to me and caused me to lose one of the turn-signal indicators. Turn signals operated fine, I just lost the indicator. Changed the bulb and still nothing. Then I looked closely at the previously mentioned connectors. I noticed that one side of one clip had come loose. I reclipped it and viola, turn signal works fine.
It's probably a long shot, but if all else checks out, it's worth a look and costs nothing but time to fix.
Good luck,
GUSTO
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I have a 98 and had the same problem. Try running a couple of treatments of Chevron Techron fuel system addative. I ran two bottles through and switched brands of fuel to 93 octane High tier fuel. Problem seems to be resolved.
BC
BC
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Burning Brakes
Joined: Oct 2004
Posts: 925
Likes: 4
From: EXTON PA
98 corvette
I am not a tech, but when I brought my used c5 vette i had the gas guage problem. I went to my auto parts store and used a good fuel injector cleaner, not stp, Lucus or Chevron product did the trick
Pro
Joined: Feb 2004
Posts: 657
Likes: 1
From: michigan
Originally Posted by 1stGlance
I had the same problem with my 2K vert - they replaced both sending units (under extended warrenty) and all is well again. Cost was around 1400. ugh 