WARNING   WARNING:  Do not dispose of fuel in the household refuse or the public sewage system. Use an authorized waste disposal facility.

Your vehicle has a diesel fuel conditioner module. The module is mounted between the outboard side of the fuel tank and the frame rail.
Note:   The module is at the front of the fuel tank or at the front of the aft-axle fuel tank on some models.
Water/Moisture in Fuel System  You should drain water from the module assembly whenever the warning light illuminates or a message appears in the information display advising you to drain the water separator. This occurs when approximately 6.76 fl oz (200 ml) of water accumulates in the module. If you allow the water level to exceed this level, the water may pass through to the engine and may cause fuel injection equipment damage.
Filter Location
Use the tables below to find the location of your filter.
Pick-up Truck

Cab Type   Box Length   Filter Location  
Regular.   8 ft (2.4 m)Left side of fuel tank.  
SuperCab.   6.75 ft (2.057 m)
8 ft (2.4 m)In front of fuel tank.  
Super Crew Cab.   6.75 ft (2.057 m)
8 ft (2.4 m)Left side of fuel tank.  

Chassis Cab

Cab Type   Fuel Tank Type   Filter Location  
Chassis Cab.   Single midship fuel tank   Right side of fuel tank.  
Chassis Cab.   Aft axle/midship fuel tanks   Right side of midship fuel tank.  
Chassis Cab.   Single aft axle fuel tank   Front of fuel tank.  

Draining the Diesel Fuel Conditioner Module
  1. Switch the engine off.
  1. Access the underside of your vehicle.
Fuel Conditioner Filter Location
  1. The diesel fuel conditioner module is on the left-hand frame rail.
Changing the Engine-Mounted and Diesel Fuel Conditioner Module Fuel Filters
  1. Drain the diesel fuel conditioner module.Turn the drain plug counterclockwise until it stops.Do not use any tools to loosen the drain plug.Drain the filter, approximately 0.5 gal (2 L), into an appropriate container.Do not re-use the fuel drained from the module.
  1. Tighten the drain plug, turn it clockwise until it stops and you feel a strong resistance.Do not use any tools to tighten the drain plug.
  1. Prime the system by turning the key to the on position for 30 seconds. Turn the key to the off position, then the on position again for another 30 seconds. Repeat this twice.