钻石40飞机维护手册 DA 40 SERIES AMM 3(43)

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A flexible hose connects the outlet from the gascolator to the inlet of the electric fuel pump. Another flexible hose connects the outlet of the electric fuel pump to a bulkhead connector at the engine firewall.
A flexible hose with an integral fire-sleeve connects the bulkhead connector to the engine driven fuel pump.
3. Fuel System Components
A. Flexible Hoses
The fuel system uses synthetic flexible hoses. The flexible hose in the engine bay have integral fire-protection sleeves.
You must only use approved hoses in the fuel system which have been pressure tested.
B. Fuel Selector/Shut-Off Valve
The fuel selector/shut-off valve is located below the cockpit floor. The selector valve is a three-way valve. A long shaft connects the valve to a selector control lever which is located in the cockpit. The selector control lever is mounted in the center console, aft of the engine control assembly.
If you set the control lever to LEFT then only the left wing tanks will supply fuel. If you set the control lever to RIGHT then only the right wing tanks will supply fuel. If you set the control lever to OFF then fuel will not be supplied from the tanks. To set the control lever to OFF you must lift a safety lock while you turn the control lever to the OFF position.
C. Fuel Gascolator and Filter
The gascolator connects to the selector valve. It has a filter and it has a fuel drain. You can remove the filter for cleaning/replacement. Use the fuel drain to drain the fuel distribution system and to drain fuel when you will do a test for fuel contamination.
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D. Electric Fuel Pump (Booster Pump)
The electric fuel pump is located in the fuselage, below the cockpit floor. Electrical power is supplied from the main electrical bus. A switch in the lower left side of the instrument panel controls the fuel pump. A five Amp circuit-breaker protects the fuel pump electrical system.
The pump is a high-pressure rotary pump. It will supply fuel to the engine if the engine driven fuel pump fails.
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Fuel System
AMM

Trouble-Shooting
1. General
The table below lists the defects you could have with the fuel distribution system. 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.
Trouble  Possible Cause  Repair 
Airplane smells of fuel.  Hose/Pipe leaking. Loose connection. Component leaking.  Examine all hoses and pipes. Look specially for green stains. Replace defective components. Examine all connections. Look specially for green stains. Tighten loose connections. Examine all components. Look specially for green stains. Replace defective components. 
Fuel pressure low.  Fuel pressure indicating system defective. Filter blocked. Fuel pump defective.  Do a test of the fuel pressure indicating system. Refer to Section 77-40. Examine the fuel filter in the gascolator. Clean replace the filter element. If you find contamination, then flush the fuel system. Do a test of the electrical fuel pump with the engine shut down. Also do a test of the engine-driven-fuel-pump with the engine running and the electric fuel pump set to OFF. Replace defective components. 

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Fuel System
AMM

Maintenance Practices
1. General
This section gives you the maintenance practices for the fuel distribution system. The procedures are limited to the removal/installation of the main components of the system.
Obey the safety precautions for fuel at all times.
WARNING:  DO NOT GET FUEL ON YOU. FUEL CAN CAUSE SKIN DISEASE. 
WARNING:  DO NOT ALLOW FIRE NEAR FUEL. FUEL BURNS AND CAN CAUSE 
　
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