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Fuel
ging of the lines is avoided.
An abrasion guard should be fitted at transition points with sharp edges.
Pipe material
Use only steel or plastic fuel lines made from light and temper-
ature-resistant PA12/ETFE, PA12/EFEP, PA9T/PA12 in accordance
with DIN 73378.
Connecting 2 lines using a hose
Risk of cavitation:
Fig. 9 shows the correct connection of fuel lines to a hose.
Legend for Fig. 9:
35) Hose clip
36) Air bubble
Make sure there are no leaks.
7.5 DP42 fuel pump
The fuel pump is a combined delivery, metering and a shut-off system and is
subject to certain installation criteria (see Fig. 4 and 10).
The Thermo Pro 90 heater must only be operated with the fuel pump
DP 42.
Installation location
Before installing the fuel pump, care must be taken to ensure that the permis-
sible pressure at the take-off point is not exceeded. The pressure values are
given in chapter 7.1 General on page 46.
The fuel pump must not be installed within the radiated heat range of hot
vehicle components. If necessary, a heat shield should be fitted. The fuel pump
should be preferably installed close to the fuel tank.
Permissible ambient temperature depending on the fuel used: see Chapter 14
Technische Daten on page 37.
Installation position and fixing
The fuel pump must be secured with a vibration-damping mounting. The
48
installation position is limited as shown in Fig. 10 to ensure effective automatic
bleeding.
The arrow shows the direction of flow of the fuel.
7.6 Fuel filter
Only a Webasto strainer is to be fitted if poor-quality fuel is used. Install verti-
cally if possible, maximum deviation not exceeding 90°. See Fig. 11.
Pay attention to installation position and direction of flow.
7.7 Sticker
A notice, indicating that the heater must be shut down before refuelling, must
be affixed to the filler neck. [...]
(Requirement from ECE-R 122, point 5.3.3.3.).
Use the sticker supplied (see Fig. 15 for an example).
7.8 Cold-resistant fuels
When switching to cold-resistant fuels, the heater must be run in burner
operation for approx. 15 minutes so that the fuel line and fuel pump are also
filled with new fuel.
See also Chapter 14.2 Brennstoff (page 37).
Thermo Pro 90
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