My check engine light stays on until fuel level approaches a quarter tank.

Hello, are you sure it's a check engine light you're speaking of? If so, it's best to get a professional assessment as to why it's coming on. When a light illuminates to indicate a trouble detected or warning, there is a code related to that light turning on that will share more information as to what is wrong with the vehicle. Teting will need to be done to know what's going on. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops