Fuel additives improve engine performance and other additives solve a variety of engine/drive-train problems. Next Project. Family Handyman. Certain additives, including fuel additives, do work. They clean your fuel injectors (and may increase fuel mileage), bolster older transmission performance, seal head gasket leaks, and stop radiator leaks.
Step 1 - Check Fuel Lines. The first step is to ensure that all the lines of the fuel system are installed correctly and that there is no dirt-clogging causing irregular fuel flow. After doing that, all the lines between the combustion chamber and the injector pump must be checked for fuel leaks. Any tiny fuel leaks in the lines can cause air StV0lAr.