Fuel Integration; Integration In Engine Supply Or Return Line; Integration Via Vehicle's Own Fuel Delivery Unit; Fuel Line - Webasto Thermo Top Evo Installation Instructions Manual

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Fuel integration

The fuel filler must not be situated in the passenger compartment and must
be provided with an effective cap to prevent fuel spillage.
(Requirement from ECE-R 122, Point 5.3.3.1.).
In the case of liquid fuel heaters, where a supply separate from that of the
vehicle is provided, the type of fuel and its filler point must be clearly
labelled.
(Requirement from ECE-R 122, Point 5.3.3.2.).
The fuel integration is carried out either in the supply or return line, or with
a special fuel standpipe.
8.1.

Integration in engine supply or return line

On vehicles with their own fuel feed pump in the fuel tank, the fuel must not
be removed from the fuel supply line!
– If the vehicle has a check valve to the fuel tank, fuel may not be removed
from the return line.
– It must be ensured that no zero balance results in the vehicle system due
to the fuel removal.
– If fuel is removed from the swirl pot, it must be ensured that this pot is
not completely drained.
Proper installation is carried out as shown in Fig. 9: Example of a fuel
standpipe.
Legend:
33) from fuel tank
34) to metering pump
35) to engine
8.2.

Integration via vehicle's own fuel delivery unit

Also see chapter 6, "Example of Installation in a Passenger Car"
The fuel standpipe is installed in the fuel delivery unit of the fuel tank. See
Fig. 12.
Legend for Fig. 12:
31) Fuel standpipe
32) Vehicle's own fuel delivery unit with hole
The installation surface of the fuel standpipe must be clean, flat and burr-
free. When mounting the fuel standpipe in the fuel delivery unit, ensure
careful routing of the standpipe. This may not impair the operation of the
parts of the fuel delivery unit including the fuel gauge in any operating mode.
The length of the standpipe must be chosen so that a minimum distance of
10 mm over the fuel tank bottom or 20 mm over the bottom of the fuel
delivery unit is ensured.
The specified securing measures of the vehicle manufacturer and the
corresponding torques must be complied with.
Under no circumstances whatsoever may the fuel standpipe be
installed in the fuel tank body, but instead only in the vehicle's
own fuel delivery unit.
8.3.

Fuel line

The fuel line is divided into the intake and the delivery line. As a result, the
intake line is a connection between the fuel tank and the metering pump,
while the delivery line produces the connection between the metering pump
and the heater.
Fuel
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