Fuel connection Thermo Top C / Thermo Top E
40
8.3. Fuel supply . The values for the permissible pressure at the fuel delivery point are
listed in the following table.
NOTE
A fuel feed line can normally be identified from the installed fuel filter.
Fuel may only
be taken from the return line with the special Webasto fuel
pickup (see Fig. 8).
The fuel pickup must be fitted so that any air or gas bubbles are
automatically discharged in the direction of the tank (see Fig. 8).
Air or gas bubbles may arise in the fuel line of the vehicle if there are
leaks in the carburetor or vehicle fuel pump or if the ambient
temperature is higher than the evaporation temperature of the fuel.
The fuel pickup should not be located near the engine, as gas bubbles
may form in the lines on account of heat radiated from the engine. This
may cause problems during combustion.
Fig. 7: Fuel supply
l
1
+ l
2
≤ 7 m
l
1
≤ 1.2 m
l
2
≤ 5.8 m
Permissible fuel inflow height
H (m)
Max. perm. excess pressure
(bar) in the fuel line l
1
0.00 0.2
1.00 0.11
Permissible fuel suction
height S (m)
Max. perm. negative pressure
(bar) in the fuel tank
0.00 -0.10
0.50 -0.06
1.00 -0.02
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