Webasto Thermo 90 Installation Instructions Manual - Thermo 90 / Thermo 90 S
Vehicles with Diesel Engines
Fuel must be drawn from the fuel tank or a separate tank
(see Figs. 5, 6 and 7). When fuel is supplied from a separ-
ate tank, any pressure-related influence can be excluded.
NOTE:
After tank extracting device has been cut to length by saw-
ing, remove any burr and metal chips from cut edge.
*
tank extracting device only to be used with
metal fuel tanks
NOTE:
The fitting must be made of sheet metal!
Vehicles with Petrol Engines
In the case of carburettor or injection engines equipped
with return lines, the heater’s fuel system is to be inte-
grated in the return line.
In the case of carburettor engines without return line, the
fuel circuit of the heater is to be integrated in the flow line
between the vehicle’s fuel tank and pump.
ANNOTATION
A fuel flow line can usually be identified by the in-line fuel
filter.
NOTE:
If the vehicle’s fuel system is equipped with a vapour sep-
arator, fuel extraction is to take place upstream of same.
For fuel extraction from flow or return lines
it is manda-
tory that the special Webasto fuel pickup
(see Fig. 8)
be used.
The fuel pickup is to be so mounted that any air or gas
bubbles that may form are automatically discharged to-
ward the tank (see Fig. 8).
Air or gas bubbles in the fuel line of the vehicle can form if
there is a leak in the vehicle’s carburettor or fuel pump or
in the case of ambient temperatures exceeding the vaporiz-
ing temperature of the fuel.
Fuel should not be extracted from within the vicinity of the
engine as gas bubbles are likely to form in the lines owing
to the heat radiating from the engine which may result in
malfunctions in the heating operation.
Fuel extracting
device
Tank fitting
Sealing ring
Fig. 5:
Fuel Extraction From the Plastic Tank
(Extraction via Tank Fitting)
Plastic tank
Sealing ring
Fig. 6:
Fuel Extraction From the Plastic Tank
(Extraction via Tank Drain Plug)
Hole Pattern
Fig. 7:
Webasto Tank Extracting Device
Thermo 90 / Thermo 90 S
5