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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.
8.3.1.
Line installation
When installing the fuel line, it must be kept as short as possible.
Intake line length [m]
Delivery line length [m]
The line must be installed protected against damage (e.g. stone impact) in
all areas.
The fuel line must always be routed in cool areas to prevent the formation
of bubbles due to warming.
High fuel temperatures can cause heater malfunctions. As a result, the line
may not be routed either past strong heat sources (e.g. exhaust gas) or near
stored heat zones.
In addition, the steepest possible routing of the fuel line must be ensured
from the fuel tank to the heater.
Fuel lines must be fastened in accordance with the latest technology so
that, for example, line sag is avoided.
Rub protection must be installed at sharp-edged transitions.
max. 1.2 m
max. 5.8 m
Do not route fuel lines through the vehicle interior.
8.3.2.
Line design
Only lines approved by Webasto may be used as fuel lines.
8.3.3.
Connecting two lines with a hose
The correct connection of fuel lines with a hose is shown in fig. 10.
Legend for fig. 10:
41) Hose clamp
42) Air bubble
The hose clamps must be tightened with a tightening torque of
1 + 0.4 Nm.
Ensure that there are no leaks!
8.3.4.
Metering pump
The metering pump is a combined delivery, metering and shut-off system
and is subject to specific installation criteria. See fig. 11 (petrol) and 12 (die-
sel).
The assignment to the fuel and the permissible installation conditions are
contained in chapter 15, "Technical Data".
Fuel
27
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