Fuel System - Husqvarna PT26 D Operator's Manual

Fuel system

Chapter 12: Fuel system
Fuel system with in-line pump has excellent
operational reliability as long as the fuel is kept clean.
If contaminated fuel is filled or enters the system in the
incorrect manner, the risk of malfunction or wear/
damage to the injection pump increases.
Contaminants include dust particles or in the form of
liquid, such as water or petrol.
The fuel in the tank is drawn up by the feed pump and
pushed through the fuel filter to the injection pump's
fuel chamber. The feed pump supplies a greater
quantity of fuel than the injection pump requires.
Consequently, there is an overflow pipe on the
injection pump, which leads off surplus fuel and
maintains the feed pressure in the fuel chamber. The
excess is routed away via the injector's leak oil line
back to the tank.
There is a hand pump on the fuel filter, which is used
to bleed the fuel system.
The injection pump pumps fuel to the injectors, which
are opened by the pressure and then spray the fuel
into the prechambers, where it is ignited by the
Hand pump
compression heat.
Fuel system
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