Husqvarna TC 250 2010 Workshop Manual page 389

INJECTION FUEL FEEDING SYSTEM (TE-TXC)
The injection fuel feeding system is composed of fuel tank (1), electric pump
(2), pipe (3) and injector (4). The fuel in the tank is pumped by the pump. The
pressurised fuel flows into the injector installed on the throttle body (6). The
electronic control unit (5) located under the tank signals the injector to open and
a fan-shaped spray of fuel is injected into the combustion chamber.
The parameters that play a role in determining proper fuel delivery under all
operating conditions are as follows:
- Air temperature in the intake manifold;
- Engine coolant temperature;
- Atmospheric pressure in the intake manifold (in current location and at cur-
rent altitude);
- Throttle opening;
- Lean or rich mixture (LAMBDA sensor);
- Battery voltage;
- Sensor power supply unit;
- Gear shift position;
- Fuel injection pulse width;
- Ignition coil;
- Lambda sensor heater.
The "DIAGNOSTIC TOOL SOFTWARE KIT (see pages S.3-S.4) provides a tool
to check these parameters in the event the fuel injection malfunctions.
The electric fuel pump (2) is installed on the bottom of the tank (1) and is com-
posed of rotor, magnet, impeller, brushes, control valve and relief valve. The
electronic control unit (5) switches the pump ON/OFF.
To remove the fuel pump, you first need to remove the fuel tank as described
in Section "E" and then the six retaining screws (a); to refit the pump, simply
reverse the removal procedure (fuel pump inspection is covered in a separate
paragraph).
a- Fuel pump retaining screw
b- Delivery fitting
c- Pump filter
d- Fuel filter
Part. N. 8000 H0368 (10-2009)
FUEL INJECTION SYSTEM
S.3
2
d
c
b
4
6