Water Separator Drain:

Step 1. Climb under the vehicle favoring the driver side. Locate the HFCM inside the driver side framerail. It is a gray box with some fuel lines going onto it.


Step 2. Locate the drain plug. In the picture above, it is brass. If yours is the OEM unit and does not look like this, you should upgrade to the brass style, as it directs fuel/water away from the driveshaft and frame rail and makes the process a lot cleaner and easier for the next time.

Step 3. Place the catch pan under the water separator and using the 6mm allen head wrench, remove the OEM drain plug. Do not lay under it, as some water and fuel will come out.

Step 4. Once drained, install the new brass plug and tighten snug, but do not over tighten.