18
3.4.3 – Fuel suction from the fuel tank of the vehicle.
Fuel is taken from a fuel line of the vehicle using a T-piece (see Fig.17). This method
can be used if there is no pressure in the fuel line. If vehicle is equipped with a low-pressure
fuel pump in the fuel tank, then those fuel lines cannot be used, fuel suction hose must be
installed instead. Mind the installation position of the T-piece.
3.4.4 Installation of the fuel pump and the fuel supply line.
The fuel pump is connected to the heater
through its own harness and supplies fuel
depending on the required heat capacity to the
combustion chamber of the heater. The fuel
pump is operated by electrical impulses sent by
the control unit. When running, the fuel pump
makes characteristic metallic clicking noise.
It is recommended to install the fuel
pump close to the fuel tank (distance should
not exceed 1 meter (see Fig.14 and Fig.17)) and below the low level of fuel in the fuel tank,
but not lower than 70cm of the minimal fuel level (see Fig.19, point a)). But the distance
between the fuel pump and the heater cannot be greater than 1,5 meters (see Fig.19, point
b)). Fuel pump should be positioned with a slight angle pointing upwards (see Fig.18)
If for some reason sealing of the fuel pump is compromised, it is advised to install the
fuel pump lower than the heater in order to avoid leaks and overflooding the heater with
fuel due to gravity.
Remember to properly bleed the “silent” TH11 fuel pump. If it’s not
properly bled it will be as loud as standard fuel pump.
To bleed it start the heater and position the fuel pump with its outlet
upwards till there are no air bubbles in the fuel line and only then secure
fuel pump in its recommended position.
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