Thermo King SLXi Spectrum, Maintenance Manual

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Engine Maintenance 9-16
Single Element Fuel Filter/Water Separator Replacement
A single element fuel filter/water separator is used on all engines. Two orifices in the filter head control the pressure in the fuel
system by allowing a certain amount of fuel to return to the tank. One orifice is located in the center of the filter head bleeds off
water and returns it to the fuel tank. The other orifice is located off-center on the filter head and bleeds off air. Replace the single
element fuel/water separator filter every 3,000 hours.
1. Unscrew the filter using a strap wrench. Drain filter and properly dispose of fuel and filter.
2. Fill the new filter with clean fuel through one of the small openings in the top of the filter body. Do not use the center hole to
add fuel to the filter or unfiltered fuel may reach the injection pump. Filling the filter with fuel purges air from the filter.
3. Clean the filter head seal surface. Lubricate filter seal with clean fuel.
4. Install and tighten the filter until it is hand-tight. Then tighten 1/4 turn more using a strap wrench.
TK 486 and 486V – Engine Fuel System
1. Relief Valve (Keeps air from entering fuel system when
engine is not running.)
2. Filter Head
3. Bleed Screw
4. Mono-Plunger and Distributor Injection Pump
5. Fuel Transfer Pump
6. Priming Pump
7. Fuel Filter/Water Separator
Typical Fuel Tank
1. Drain Plug
1
2
3
4
5
6
7