Diamond DA20-C1, Maintenance Manual

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Engine Fuel and Control
DA20-C1 AMM
14 Jan 13
Page 2 DA201-C1
Rev 21
73-00-00
B. Indication
Figure 1 shows the location and installation of the components in the aircraft.
The DA20-C1 aircraft has a fuel pressure indicating system. The fuel pressure indication system
has the following two 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
Figures 2 and 3 show the fuel hoses in the engine compartment. Two hoses connect the engine
fuel injection pump to the aircraft fuel system. The fuel supply hose connects to the through nut
from the fuel shut-off valve at the firewall. The fuel return hose connects to the return through nut
at the firewall. Figure 2 shows the fuel hoses with
On aircraft equipped with the manifold valve fuel vapor separator, a second return line runs from
the fuel manifold valve through holes in the aft baffle and splash shield to join the fuel injection
pump return line at a tee fitting. The tee fitting is connected to the 90 fitting that is connected to the
return through nut at the firewall.
A heat shield on the right side of the engine protects the fuel injection pump supply and return
hoses from the exhaust manifold. P-clamps attach the hoses to the heat shield and to the front of
the engine.
You must bleed the engine fuel system after any work which allows air into the fuel system. The air
can become trapped and cause starting problems. Refer to the bleed procedure in maintenance
practices in this chapter.