i have a 1997 pontiac montana i am haveing trouble with the gas guage reading from empty to full i had it at the shop and they said it was the sending unit in the tank i recently changed the whole tank and unit my self before i changed the tank the guage always read full now the tank always reads empty and the indicator light is on as it should when i turn the van on the guage does move to 1/4 tank and goes right back to empty i have filled the tank and it still reads empty any suggestions would be apriciated
Keebler

 

High sulphur content in gasoline makes lots of GM gas guages go to ZERO. My Corvette has the same problem. Had the sending unit replaced in the Vette under warranty but it came back about 2 years later. Adding a large bottle of TECHRON for a few tanks should clear up the sulpher ozidation enough to make the guage read again. Techron is added to Chevron and Texaco gas. Costs MORE but do you want to read your guage or not? Also the guage in my Montana is very INNACURATE. Shows full for a LONG TIME then when it goes to half full you are over 3/4 empty. Have the overhead display which I reset every fillup so I can track how much gas I'm USING.