When performing standard diagnostic procedures, this tool is to be used as the “clean” or “alternative” fuel source when referenced in the procedures. DO NOT store fuel in the Clean Fuel Source Tool when it is not in use. Includes: x1 Storage Tank, x1 Supply Line (p/n: 15-637-01-02), x1 Return Line (p/n: 15-637-01-03), x1 Supply Adapter (p/n: 15-637-01-04), x1 Return Line (p/n: 15-637-01-05), x1 Supply Adapter (p/n: 15-637-01-06), x1 Supply Adapter (p/n: 15-637-01-07) and x1 Return Adapter (p/n: 15-637-01-08).