To clean and repair the fuel filter, drain water using the drain valve (9) to remove some water first and all water for filter, drain valve, heater element or Wif sensor replacement. Set a drain pan under the drain hose (7) on the drain valve at the bottom. When the engine is off, turn the drain handle counter-clockwise to Open, leaving it open until no more water and contaminants are draining from the engine. When replacing the drain valve, fuel heater element or Water-In-Fuel (Wif) sensor, first drain the housing totally and dispose of the mixture following the rules. Following draining, turn the valve handle clockwise to get it into the Close position. Before putting in a new filter, clean anything around the housing, open the canister lid with a socket on the large hex bolt (2) and remove the O-ring. Turn the filter vertically to take it out of the gun. Disconnect the electric connector, wipe away any debris, slide out the Wif sensor from the socket as you rotate it counter-clockwise and check the O-ring for any signs of damage. To change the fuel heater element, take out the fuel filter, unplug the electrical connector and remove the two screws (3) with a T-15 Torx head. Let's first disconnect the drain hose, remove the four T-15 Torx head screws from the mounting plate and then remove the drain valve. While you plug in a new filter element, remember to clean the filter compartment and everything attached to it, fit an O-ring around the canister's lid, oil it up, add the new element into the canister and secure the lid to 34 Nm (25 ft. lbs.) of tightness. To install a Wif sensor, put in a new seal, lubricate it, install the sensor, tighten it to 2.5 Nm (25 in. lbs.) and attach the electrical connector. For the fuel heater element, put it and the
Thermostat into the housing, make sure the screws are tightened to 1-1.5 Nm (13 in. lbs.), attach the electrical wiring cover and add and lubricate a new O-ring on the filter housing cover before tightening it. Afterwards, fit two new O-rings onto the drain valve, smear silicon grease onto both materials, connect the valve, tighten all screws to 1-1.5 Nm (8-13 in. lbs.), connect the drain hose and start the engine to see if there are any leaks.