If it seems as though you just bought gas a few days ago but your tank is already setting on empty you may have a problem with your gauge or fuel level sending unit. This unit is located in your fuel tank and is responsible for sending information about the level of fuel in your tank to the fuel gauge located in your dashboard. This unit works on electricity and the resistance or lack of resistance encountered by the unit when it takes a reading is what determines where the line on your gauge points. When your tank is full very little resistance is encountered so the gauge needle points towards full. When your tank is almost empty the opposite is true. By design this system is very vulnerable to corrosion so if your sending unit gets coated with rust you may need a Replacement Fuel Level Sending Unit. And, since so many different parts are working together inside of this unit, one small breakage means that you will need an entire Replacement Fuel Level Sending Unit. Once installed there is no easy way to check the true condition of your Replacement Fuel Level Sending Unit so it best to purchase one that offers the most in corrosion resistance and long lasting performance life. Gearheads deserve superb support and help while buying good quality parts for a car or truck. So of course we established a 24-hour, 7 day a week sales support call desk to answer your questions. To make a good deal even better, there is 100% free shipping for every order more than $50. If you spot a better price somewhere else, let us know - we will meet or beat any advertised price for auto parts.