Supplement Airplane Maintenance Manual
Cessna 172 with TAE 125-02-99 / -114
AMM-20-02
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20-AMM-73-02
3
06.11.2013
1
10
1
25.08.2014
73 ENGINE FUEL SYSTEM
73.00 GENERAL
DESCRIPTION
The engine is a direct Diesel injection engine with common-rail
technology.
Fuel passes the selector, the electric gear pump (if installed) and
reaches the filter module, where the cold fuel is warmed by
returning fuel (until the feeding fuel temperature of 60°C).
Thereafter it reaches the feed pump (building a pressure of 5 bar
[72.5 psi]) and then the high pressure piston pump, producing a
pressure up to 1500 bar (21755 psi), which is led to the rail. The
pressure is measured and regulated between 500 bar (7252 psi)
and 1350 bar (19580 psi) by a pulse width modulated control
valve.
Since the main pump produces a high fuel flow and only a part of
it is used for combustion, the rest is returned through the filter
module and fuel selector to the tank in use, where it warms the
remaining fuel.
Figure 1 Engine Fuel System
Note: Due to Diesel injection principle there is no carburetor, primer or
mixture necessary.
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