My fuel gauge in my 2002 Blazer sticks at 1/4 tank and sometimes bounces all over the place when tank is half full. What is causing this. If it is the sending unit what does this cost to fix.

 

My fuel gauge in my 2002 Blazer sticks at 1/4 tank and sometimes bounces all over the place when tank is half full. What is causing this. If it is the sending unit what does this cost to fix.

 

It is a sending unit problem. The sending unit itself can be replaced separately, but it requires dropping the fuel tank.

 

thank you. Seems like this is a common problem. Should have been a recall. Are the the replacement sending units from gm better than the originals with this problem

 

They have been updated. The life of the sending unit can be prolonged with the use of Top Tier fuel and/or using GM Fuel System Treatment at each oil change. It is the sulfur in the non-Top Tier fuels that causes problems with the resistance grid in the sending unit. GM isn't the only manufacturer with this problem either. I have seen quite a few other manufacturers with this problem on mid to late 90's vehicles.

It's not a recall because it is not an immediate safety problem. You can always fill up more frequently to avoid running out of fuel.