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% The outlet from the alternate air valve connects to the turbo-charger. The outlet from the turbo-% charger connects to an intercooler. The outlet from the intercooler connects to the engine inlet % manifold. Refer to Chapter 81 for more data on the turbo-charger and intercooler.
% B. Engine Fuel System
% (1) General
% Fuel from the airplane fuel system goes into the engine fuel filter. The fuel filter is located on % the top right of the engine compartment, adjacent to the firewall.
% The inlet fuel goes through the filter and out to the engine-driven low-pressure fuel pump. The % low-pressure fuel pump supplies fuel to the engine high-pressure pump. The high-pressure % pump supplies fuel to a common rail connected to the injectors. A combined pressure relief and % regulator valve at the end of the common rail controls the fuel pressure. Surplus fuel from the % valve returns to the fuel filter.
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% (2) Fuel Filter Heating
% The return fuel from the engine is warm. The fuel filter has a thermostatic bypass.
% If the return fuel is warm but not hot, then the thermostatic bypass guides the return fuel from % the engine into the fuel filter. The return fuel mixes with the cold fuel from the tank and % increases the fuel temperature in the fuel filter. This prevents the fuel filter from becoming % blocked. No fuel returns to the airplane fuel system.
% If the return fuel is hot, then the thermostatic bypass connects the return fuel from the engine % to the return line of the airplane fuel system. Fuel will return to the left tank through the cooling % loop in the right tank (refer to Chapter 28).
% You must examine and replace the filter at the times given in Chapter 05.
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Engine Fuel and Control
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% Trouble-Shooting % 1. General
% The table below lists the defects you could have with the engine fuel and control system. It only gives % you the data for the air intake, air filter and fuel filter. For more data on trouble-shooting the engine % fuel and control system refer to the engine manufacturer.
% If you have the trouble detailed in the Trouble column read across to the Possible Cause column.
% Then do the repair given in the Repair column. % %

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Trouble  Possible Cause  Repair 
Loss of engine power.  Blocked air intake. Dirty/Damaged air filter. Dirty/Damaged fuel filter. Air in fuel distribution system.  Examine the air intake. Remove any obstructions. Refer to Section 71-61. Replace the air filter. Refer to Section 71-61. Replace the fuel filter. Look for contaminated fuel in the airplane fuel system. Refer to Section 28-21. Bleed the fuel distribution system. Refer to Section 28-21. 

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Engine Fuel and Control
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% Maintenance Practices % 1. General
% This Section tells you how to remove/install the fuel filter. Only an approved TAE 125 repair shop can % repair the engine fuel system. For more data on the engine fuel and control system refer to the engine % manufacturer.
% Refer to Section 71-61 for maintenance data on the air filter and alternate air valve. Refer to % Chapter 81 for maintenance data on the turbo-charging system.
% % 2. Remove/Install the Engine Fuel Filter and Replace the Element
% A. Remove the Engine Fuel Filter % %
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Detail Steps/Work Items  Key Items/References 
WARNING: YOU MUST MAKE SURE THAT THE ENGINE IS SAFE BEFORE YOU DO WORK ON THE ENGINE. IF THE PROPELLER TURNS IT CAN CAUSE INJURY TO PERSONS. 
　
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