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MAINTENANCE PRACTICES ....................................................................................................201
1. General .........................................................................................................................201
2. Remove/Install The Induction Air Filter.........................................................................201
3. Remove/Install the Fuel Pressure Sensor ....................................................................202
4. Remove/Install the Fuel Pressure Indicator..................................................................204
5. Fuel Pressure Indicator Functional Test.......................................................................205
6. Engine Fuel System Bleeding Procedure.....................................................................206
Engine Fuel And Control
DA20-C1 AMM
Page 2
19 Dec 1997 73-CONTENTS Doc # DA201-C1
Rev. 0
Intentionally left blank
DA20-C1 AMM
Engine Fuel And Control
Doc # DA201-C1
Rev. 9 73-00-00 Page 1
29 Apr 2004
CHAPTER 73-00
ENGINE FUEL AND CONTROL
1. General
This Chapter tells you about the DA20-C1 engine fuel control system. And it tells you about the
engine fuel pressure indicator. It also tells you about the fuel pressure sensor. It does not give you
the data to do maintenance on the engine fuel control system. And it does not tell you about
maintenance in the repair shop.
It does tell you how to remove/install the engine air filter, fuel pressure sensor and fuel pressure
indicator. It also tells you how to trouble-shoot the engine air filter and the fuel flow indication
system. And it tells you how to bleed the fuel pipes.
Refer to the Teledyne Continental IO-240-B Maintenance Manual for data/instructions to do
maintenance on the engine fuel system. Also refer to the applicable service bulletins before you do
work on the engine fuel system.
2. Description
A. Engine Fuel Control
The Teledyne Continental Motors IO-240-B engines are fuel injected with a down draft induction
system. The intake manifold supplies air to the air distribution system. The air distribution
system mounts above the engine cylinders, it sends induction air to the cylinder intake ports.
The cylinder intake ports are cast into the cylinder head assembly. The air mixes with fuel from
the injector nozzles where it enters the cylinders as a combustible mixture.
The fuel injection system uses a low-pressure system to inject fuel into the intake-valve port in
the cylinder head. The four basic parts to the fuel injection system are, the fuel pump, fuelmetering
unit, fuel manifold valve and fuel nozzles. Fuel flows from the fuel pump to the fuelmetering
unit. The fuel then flows from the metering unit to the fuel manifold valve. From the
fuel manifold valve the fuel then flows to the four injector nozzles.
The ram air supplied to the intake manifold goes through a filter assembly. The filter assembly
attaches to the engine air intake at the left side. Polyurethane foam makes the filter element. A
stainless steel screen at the front and the rear of the filter element makes the filter assembly.
Engine Fuel And Control
DA20-C1 AMM
Page 2
28 June 2005 73-00-00 Doc # DA201-C1
Rev. 11
Figure 1: Location and Installation of the Fuel Pressure Sensor
DA20-C1 AMM
Engine Fuel And Control
Doc # DA201-C1
Rev. 11 73-00-00 Page 3
28 June 2005
B. Indication
Figure 1 shows the location and installation of the components in the airplane.
The DA20-C1 has a fuel pressure indicating system. The fuel pressure indication system has 2
components: A fuel pressure sensor and a fuel pressure indicator.
The fuel pressure sensor is located on the upper right side of the engine mount. It senses
pressure at the outlet of the fuel manifold on the engine, which is the pressure of the fuel going
to the injection nozzles. A hose and a restricting orifice connect the manifold to the sensor.
Alternatively, some aircraft have the pressure sensor located upstream of the manifold valve, in
which case it is connected to a tee fitting in the line between the fuel metering unit and the
manifold valve. The tee fitting penetrates the aft engine baffle.
The fuel pressure indicator is located on the right side of the instrument panel. It uses the
pressure signal from the pressure sensor to set the pointer. The markings are in pounds/square
inch
If the fuel pressure in the manifold increases, the flow to the engine injection nozzles increases.
The fuel pressure sensor measures the pressure. If the pressure increases, the indicator shows
a higher pressure.
C. Fuel Hoses in the Engine Compartment
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钻石20系列AMM 2(82)
