Here's a pic of what happens to the sender.
Should be 3 little fingers on each of those two tabs. They're all worn away.

 

Got it! I'll let you know how it turns out. But at $25 a bottle, this stuff better do something.

 

Holy Moly...the Counter Guy didn't cut you a break on that? **** the bed!!! I feel terrible trying to tell someone that stuff is $25.00. I keep ours marked down to $18.50 per bottle. While $18.50 is still high, it sure ain't as high as $25.00.

You may need to schmooze the guy a little.

 

I know... and he even made me pay for my DTRL bulb, I was used to them handing it to me and telling me not to worry about it. But I guess GM is hurting for income right now, so I consider paying full price as my charitable act for the day.

 

So after the special GM injector cleaner, the gas gauge moves a little slower making it look as though I am using less gas (however I don't really know if it is any more accurate), but it still only reads as high as 3/4 tank when I fill up. I feel like it might be more accurate just because it doesn't jump from 3/4 tank to 1/2 tank after a day of driving and now it slowly decreases. Either way, it was worth a shot.

 

After all that...it sounds like to me..that you may have a bad fuel guage in your instrument cluster. That is quite common. You may be getting the ol' run-around by your dealer or the Service Advisor.

 

I just had the gauges replaced two weeks ago under under the GM recall/warranty. The service tech said it was the fuel level sensor, but I really don't feel like buying a new one then dropping the tank so my gauge will read "FULL" when I fill up.

 

this is what i did. https://www.performancetrucks.net/fo...d.php?t=422461