Let's say your mechanic determines that your car has a broken gas cap, causing the "Check Fuel Fill Inlet" warning light to illuminate. Your new gas cap will probably set you back about $70. That is a relatively low cost to pay for a component that is essential to the efficient operation of the remainder of your car's fuel system. To turn off the "Check Fuel Fill Inlet" signal, however, the mechanic might have to delve a little deeper. More than simply replacing a broken gas cap will be needed to locate and fix a vacuum pressure leak. Despite this, turning off the "Check Fuel Fill Inlet" light doesn't have to cost a lot of money. The majority of this system's repairs are little ones.