Volvo Penta D1-13 Workshop Manual page 43

P0007863
1 Fuel tank
2 Prefilter
3 Feed pump
4 Fuel filter
5 Hand pump
6 Injection pump
7 Injectors
47701798 05-2013 © AB VOLVO PENTA
20-0 Engine Information, General
Group 23: Fuel System
A mechanical feed pump draws fuel from the fuel tank
via an optional water separation prefilter (optional
equipment), and then forces fuel through a fine filter
to the injection pump.
The camshaft driven injection pump then distributes
the fuel in precisely timed and measured quantities to
the injectors.
Fuel which returns from the injectors is returned to the
base of the fuel tank. Air in the fuel system can be
transported back to the fuel tank via a connection
between the injection pump and the return fuel pipe.
The fuel is then forced at high pressure through the
injector nozzles into a pre-combustion chamber in the
cylinder head and then enters the piston combustion
chamber, where an air vortex contributes to even
combustion. A glowplug in the pre-combustion cham-
ber pre-heats the fuel mixture for cold starting.
The engine fine filter removes contamination which
may be left in the fuel, despite the prefilter.
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