Developed for cleaning fuel systems and injectors within minutes and restore lost power caused by deposits. Ideally Diesel Purge is added into the fuel filter housing. It will eliminate knocking, pinging and exhaust smoke. Improves start up performance. Preventive use: Fill the fuel filter up with Diesel Purge when doing filter replacement, put the rest in tank. In case of problems run the engine directly with Diesel Purge through intake line or diesel filter. Preventive use Fill the fuel filter up with Diesel Purge when doing filter replacement, put the rest in tank. Remedial use Unclip the fuel pipe and immerse the end in the Diesel Purge. Close the fuel return pipe or feed that into the Diesel Purge. Start the engine and allow the engine to run at different speeds with the Diesel Purge unmixed. After the cleaning process, assemble the vehicle's system. In extreme cases, repeat the cleaning procedure if necessary.