Fuel Supply - Webasto Air Top 2000 STC Installation Instructions Manual

Air Top 2000 STC
7

Fuel supply

The fuel is taken from the vehicle's fuel tank or from a separate fuel tank.
Refer to Chapter 7.1.4, "Pipe lengths and delivery head" for the permissible
pressure at the fuel take-off point.
A notice, indicating that the heater must be shut down before refuelling,
must be affixed to the filler neck.
7.1. Fuel lines
7.1.1. Vehicles with carburetor engine
The fuel may only be extracted with the special Webasto fuel extractor (Fig.
8) as close to the fuel tank as possible. The connection can be made either
in the supply or return line, where the return line must extend almost to the
bottom of the fuel tank.
The fuel extractor must be installed in such a way that any air or gas bubbles
are automatically expelled towards the fuel tank (Fig. 8).
Fuel should be extracted in the vicinity of the engine as gas bubbles can form
in the lines in this area due to the heat radiated from the engine. This can
cause combustion problems.
7.1.2. Vehicles with fuel injection engine
When installing the heater in a vehicle with a fuel injection system, it is
important to establish whether the fuel pump is located inside or outside the
fuel tank.
If the fuel pump is located inside the fuel tank, fuel can only be extracted
from the return line using the Webasto fuel extractor (Fig. 8). In this case it
is necessary to ensure that the return line extends almost to the bottom of
the fuel tank (otherwise the Webasto tank extracting device (Fig. 9, Fig. 10
and Fig. 11) can be used.
If the fuel pump is installed outside the fuel tank, the fuel connection can be
from fuel tank
to fuel pump
Fig. 8: Webasto fuel extractor
made between the fuel tank and the fuel pump, again using only the
Webasto fuel extractor (Fig. 8).
7.1.3. Extracting fuel with tank extracting device
Fuel must be extracted from the fuel tank or a separate tank (Fig. 8, Fig. 9
and Fig. 10). Separate fuel extraction has no influence on the pressure.
Fuel supply
to motor
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