Buick Rainer Fuel Gauge

[welscher08]

Everyone, I have a guy at work i work with, and his Rainer has an issue with his fuel gauge. I can't remember when he fills it if it stays at 1/4 of a tank or empty. I believe a 1/4, but he fills it with gas and then it doesn't go to full. After driving it a day it will show full, as it should. Then be fine the rest of the tank. Is this the sending unit in the tank? Or the gauge? Any ideas?

 

I also read about Chevron's Techron, where you put a bottle in your tank and how it claims it can fill fuel gauge readings, do you think this would help/cure the problem? I told him its worth a shot and we can try it.

 

If the sending unit what does that usually run and can you do it yourself, drop the tank i assume? It doesn't bother him terrible, but enough if it was something we could do to fix pretty easy, like most would. Thanks for the help in advance. Ryan