HL 90
8 Servicing
803
Fig. 803 Webasto Fuel Tank Tap *
* Use fuel tank tap only on metal fuel tanks
Fig. 804 Fuel Tapping from Plastic Tank
(tapping via fuel drain plug)
Fig. 805 Fuel Tapping from Plastic Tank
(tapping via fitting plate)
NOTE
The fitting plate must be made of sheet metal!
8.6.2.2 Fuel Lines
Fuel lines may only be steel, copper, or plastic lines made
of unhardened, light and temperature stabilised PA 11
or PA 12 (e.g. Mecanyl RWTL) according to DIN 73378.
As in most cases 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,
air or gas bubbles accumulate resulting in malfunctions
should the lines be descending or having sags. The
diameters specified in Fig. 801 ensure no disturbing
formation of bubbles.
A descending line routing from the 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 slipping with
hose clamps.
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