Webasto Air Top 2000 ST B Installation Instructions Manual page 19

Air Top 2000 ST
Plastic tank
Sealing ring
Fig. 11: Fuel pick-up from the plastic tank
(Pick-up via tank drain screw)
Tank connector
Tank fitting
Fig. 12: Fuel pick-up from the plastic tank
(Pick-up via tank fitting)
NOTE:
The tank fitting must be made from metal!
7.4.
Only steel, copper and plastic lines of plasticised, light and temperature-
stabilised PA 11 or PA 12 (e.g. Mecanyl RWTL) pursuant to DIN 73378 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 and these will cause malfunctions whilst the heater is operating if
the lines sag or are routed downwards. The diameters specified in Figure 8
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 sagging. They
must be installed in such a way that they cannot be damaged by flying road
Sealing ring
chippings and high temperatures (exhaust line).
The fuel lines must be secure at the connections using hose clips to prevent
their slipping.
Fuel lines
Fuel supply
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