Webasto BBW 46 Installation Instructions Manual page 8

BBW 46 / DBW 46
l
2
l
1
l
2
l
1
≤
l + l 13 m
1 2
≤
l 3 m
1
≤
l 10 m
2
Fig 9: Fuel Supply
6
Fuel Supply
Details on the permissible pressure at the fuel extraction
point are contained in the table below.
Permissible at max. permissible
fuel feed height H (m) overpressure (bar) in fuel
0.00
1.25
2.50
3.75
5.00
6.25
7.50
8.75
10.00
Permissible fuel suction at max. permissible
height S (m) underpressure (bar) in fuel
petrol
0.00 -0.15
0.50 -0.11
1.00 –
NOTE
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
that the special Webasto fuel pick-up
used.
line
1.5
1.4
1.3
1.2
1.1
1.0
from tank
0.9
0.8
0.7
to metering pump
Fig 10: Webasto Fuel Pick-Up
tank
diesel
-0.15
The fuel pick-up is to be mounted so that any air or gas
-0.11
bubbles that may form are automatically discharged to-
ward the tank (see Fig. 10).
-0.07
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
if the ambient temperature exceeds the evaporating tem-
perature of the fuel.
Fuel should not be extracted in the vicinity of the engine
since here gas bubbles are likely to form in the lines owing
to the heat radiating from the engine, which may result in
malfunctions of the combustion operation.
imperative
(see Fig. 10) be
to engine