to me it sounds like a fuel pump. When there is less fuel the fuel pump has to work harder to pump the gas then when it has plenty of gas a good mechanic would graph the wave form of the fuel pump and find out how many rpm the pump is turning at at a 1/4 tank or less and see that the pump is already on the way out.
2009 Turbo Cobalt SS
traded in 2005 SS/SC
Dragracing is for fast cars, autocross is for fast drivers.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
This car looks fast even standing still!