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Fig. 8-3 Webasto Fuel Tank Tap*
fuel tank must be investigated first.
* Use fuel tap only on metal fuel tanks
If the fuel pump is fitted inside the fuel tank, the fuel may
be tapped only from the return line ensuring that the
return line is routed almost to the tank floor. If this is not
the case the fuel line may be lengthened.
In case of a fuel pump mounted externally to the tank,
the fuel tap can be located between the fuel tank and the
fuel pump.
8-4
THERMO 90 / 90 S 8 SERVICING
8.6.3 Fuel Dosing Pump
8.6.2.2 Fuel lines
Fuel lines may only be steel, copper, or plastic lines
The fuel dosing pump is a combined delivery, dosing,
made of unhardened, light and temperature stabilized
and shut-off system and is subject to certain installation
PA 11 or Pa 12 (e.g. Mecanyl RWTL) according to
criteria (see Figs. 8-2 and 8-5).
DIN 73378.
As in most cases, if a permanently rising fuel line routing
cannot be ensured, the inner diameter must not exceed a
certain value. Starting from an inside diameter of 4 mm
(5/32 in.), air or gas bubbles accumulate resulting in
malfunctions should the lines be descending or having sags.
The diameters specified above (2 mm) ensure a non-
accumulation of air bubbles.
A descending line routing from the fuel dosing pump to
the heater should be avoided.
Loose fuel lines must be secured in order to avoid
sagging. The installation must ensure protection against
stone impacts and undue temperatures (exhaust line).
The fuel line joints are to be secured against loosening
with hose clamps.
Connection of 2 Pipes with Hose
The proper connection of fuel lines with hoses is shown
in Fig. 8-4.
Fig. 8-5 Fuel Dosing Pump, Installation Location
and Attachment
8.6.3.1 Installation Location
It is advantageous to mount the fuel dosing pump in a
cool location as near as possible to the fuel tank. The
ambient temperature must never exceed +20 °C (68 °F)
Fig. 8-4 Pipe/Hose Connection
for gasoline and +40 °C (104 °F) for Diesel installations
at any time while in operation. The maximum pressure at
the tapping location must be below 1.5 bar (21.75 psi.).
Fuel dosing pump and fuel lines must not be installed in
locations exposed to heat radiated by hot vehicle
components. A heat shield is to be provided as required.
8-5
8 SERVICING THERMO 90 / 90 S
8.6.3.2 Installation and Attachment 8.6.6 Exhaust Line
The fuel dosing pump is to be attached with anti-vibration
The exhaust line (inner diameter 38 mm or 1.5 in.) may
mounts. The installation location is limited according to
have a length from 0.5 m to 5 m (18 in. to 16 ft.) and be
Fig. 8-5 to ensure sufficient self-bleeding capability. Due
routed with several bends totaling no more than 360°.
to the danger of corrosion, the plug connection between
Smallest bending radius is 85 mm (3 3/8 in.).
fuel dosing pump and fuel dosing pump cable loom may
only be fitted with Webasto original spare parts.
The exhaust muffler is mandatory and to be mounted
near the heater.
8.6.4 Fuel Filter
In order to ensure the angle of 90° ± 10°, an attachment
is required no further than 150 mm (6 in.) away
If there is the probability of contaminated fuel, only the
measured from the exhaust pipe end.
Webasto filter, part number 487171, may be used. The
use of fuel filters not designed for Webasto heater fuel
systems may cause a vapor lock or interfere with the
proper delivery of fuel.
The fuel filter can be installed anywhere between the
vertical and horizontal positions, but must be installed in
the direction of flow.
8.6.5 Combustion Air Supply
Combustion air must under no circumstances be
extracted from rooms with persons. The combustion air
inlet must not point towards the forward direction of
motion. It must be located so that no clogging by
contamination, impact of snow, or intake of splash water
is possible.
The combustion air intake line (inner diameter at least
30 mm or 1 3/16 in.) may have a length from 0.5 m to 5
m (18 in. to 16 ft.) with several bends totaling no more
Fig. 8-6 Exhaust Outlet, Direction of Flow
than 360°. Smallest bending radius is 45 mm (1 3/4 in.).
The combustion air inlet must not be located above the
exhaust outlet.
The exhaust pipe outlet opening must not point in the
direction of motion (see Fig. 8-6).
NOTE:
The combustion air intake line is to be routed in a
The exhaust pipe outlet opening must be located so as
downward direction. If this is not possible, a water drain
not to allow clogging by snow or mud.
hole (4 mm or 5/32 in.dia.) must be provided at the
lowest point. [ Pobierz całość w formacie PDF ]

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