The coronary arteries regulate the supply of blood to your heart muscle depending on how much oxygen your heart needs at the time, as indicated by: 1  The number of times your heart beats per minute (heart rate). 2  Your blood pressure. 3  The force of your heart's contractions.  The thickness of your heart muscle.
When your car's Check Engine light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap.
First, we have to understand why a check engine light comes on. A check engine light is to let you know that your vehicle is releasing undesirable emissions. Second, we need to understand how the fuel system is related to the check engine light. Fuel evaporates, and it evaporates while in the fuel tank.