I keep my car on a full tank of gas because not know how much gas I have.I set my trip miles to 0 after each fill up and around 100 miles I refill tank,well I went to 145 miles and the gage droped down to a half a tank and started working not sure if it was the right amound of gas doe but it was working. but when I put more gas in the same thing after 145 miles it start working again.well now the other day I had to take a long trip and filled up and about 45 minutes later the gas gage droped down to emty while driving 70 mph and a few minutes later shot back to full and the same thing on my way bach home.could this be a bad sending unit or in my dash board?
Gas gage stays on full while car is running on 2000 Buick LeSabre
by 712joker in Paducah, KY on September 09, 2012
ANSWER by goodguy , September 09, 2012
probably a bad level sensor in the gas tank
ANSWER by glenntrotter01 , September 09, 2012
could bee what goodguy said or a short in the wireing be carefull .
ANSWER by globalhelper , September 09, 2012
have a gauge sweep done on gauges to see if its a gauge or wiring issue b4 repl sending unit