Thegass gaugeon my 1997 Blazer 2dr 4.3 with 4wd fluctuates. From what I have read,this is caused by sulphur buildup on the contacts of the fuel sending unit. Wouldremoving it out and cleaning with electrical cleaning solvent solve the problem? That would be a cheap fix if it would work. A new sending unit sells for about $100.

 

It is possible, but the sulfur attacks the metal in the sensor grid. The sending unit itself shouldn't be $100... But I guess that depends on your location and where you are looking to buy it. I just wouldn't want to spend all of the time removing it for the repair to not be final.

 

And that's another reason for the recommendations that Kyle and I make for Techron Concentrate Plus fuel additive. It helps clean off and prevent the sulfur build-up on the sending unit in the tank.