Webasto Air Top 2000 S D Service Manual download pdf (Page 18)

Fuel supply Air Top 2000 ST

7.1. Vehicles with carburettor engines

The fuel may only be extracted using the special Webasto fuel extractor

(see Figure 9) as close to the tank as possible. The connect may be made

in either the supply or return line, in which case the return line must lead

almost to the base of the tank (see Figure 10).

The fuel extractor must be fitted in such a way that any air or gas bubbles

are automatically discharged towards the tank (see Figure 9).

Fig. 9: Webasto fuel extractor

to metering pump

to engine

from tank

The fuel extractor 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.

7.2. Vehicles with injection engines

When installing the heater in a vehicle with fuel injection system, it is im-

portant to establish whether the vehicles fuel pump is located inside or

outside

the

tank.

the fuel pump is located inside the tank, fuel can only be extracted from

the return line using the Webasto fuel extractor (see Figure 9), in which

case it must be checked to ensure that the fuel return pipe in the tank ter-

minates near the bottom of the fuel tank (see Figure 10 for details of the

minimum distance from the bottom of the tank). If this is not the case We-

basto fuel extractor (see Figure 10, 11 and 12) may be used.

If the fuel pump is installed outside the tank, the fuel connection may also

be made between the tank and the fuel pump, again using only the We-

basto fuel extractor (see Figure 9).

7.3. Vehicles with diesel engines

The fuel must be taken from the vehicle fuel tank or from a separate tank

(see Figs. 9, 10 and 11). This separate fuel pick-up precludes any effect of

pressure.

Fig. 10: Webasto tank connector

Hole pattern

Minimum distance 25 mm

Only use a tank connector if the fuel

tank is made from metal

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Webasto Air Top 2000 S D Service Manual Page 18