My fuel gauge in my 07 H3 was acting strange, coming down from 3/4 tank to 1/4 tank then back up intermittently. I took it to the dealer and they said this was a common problem and was due to high sulfur content in the gasoline now days, especially from Valero. Apparently, the sulfur builds up and affects the sending unit. They said the fix was to add a fuel cleaner and sold me a GM fuel cleaner for 27 dollars to mix with the gas at my next fill up. Anyone else experience the similar problems? Thanks, Mezlan

 

Nope..you are the first..I didn't realize They used their own refined gasoline..usually it ALL comes from a common BULK facility and then the additives are added for the specific brand..

 

I found this and was wondering if anybody else has tried it!

"GM has just issued a TSB
on this problem that applies to ALL GM vehicles and
blames the high incidence of sending unit failures
on high levels of sulfur in gasoline. The sulfur
corrodes the sliding resistor mechanism and
produces erratic and inaccurate gauge readings. To
address this problem, GM has released a FUEL
TANK ADDITIVE.
According to GM TSB #06-00-89-07BB, you should
purchase a bottle of GM Fuel System Treatment
Plus (part #88861011 for GM brand, 88861013 for
AC Delco brand, and 88861012 in Canada) and add
it to your tank at every oil change. The additive
cleans the sulfur corrosion from the sending unit
and prevents new corrosion by laying down a
protective film. The additive also removes engine
deposits."