Webasto Thermo Pro 90 D, Installation Manual

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www.webasto.us 21 Webasto Thermo & Comfort N.A., Inc.
Thermo Pro 90 Fuel Supply
8.3 Fuel Lines
Only steel and plastic lines made of plasticized, light and
temperature-stabilized may be used for the fuel lines.
Since the lines normally cannot be routed with a constant
rising gradient, the internal diameter must not be
allowed to exceed a certain size. Air or gas bubbles will
accumulate in lines with an internal diameter of more
than 4 mm (5/32 in.) and these will cause malfunctions
whilst the heater is operating if the lines sag or are
routed downwards. The diameters specified in Figure 16
will ensure that bubbles do not form.
The lines should not be routed downwards from the
metering pump to the heater.
Unsupported fuel lines must be secured to prevent them
from sagging. They must be installed in such a way that
they cannot be damaged by flying road debris and high
temperatures, i.e. close to the exhaust line.
The fuel lines must be secure at the connections using
hose clips to prevent their slipping.
IMPORTANT!
Cut lines without burr and do not crush
them. Do not cut fuel line with side cutting
pliers!
8.3.1 Connecting two fuel lines with a
coupler hose
The correct procedure for connecting fuel lines with
hosing is shown in Figure 22. Ensure that there are no
leaks.
Figure 22: Fuel line / coupler hose connection
Figure 23: Fuel line / coupler hose connection
8.4 Fuel Metering Pump
The fuel metering pump is a combined delivery, metering
and shut-off system and is subject to certain installation
criteria (see Figures 24).
Figure 24: Metering pump DP42 - installation position
8.4.1 Installation Location
It is advisable to install the metering pump in a cool
place.
The metering pump and fuel lines must not be installed
within range of the radiated heat from hot vehicle parts.
A heat shield must be used if necessary.
Clamp
Bubble
Bubble
Wrong
Correct