Webasto Air Top 3500 ST Installation Instructions Manual page 18

Fuel supply
7.4.1. Connecting two pipes with a hose
The correct procedure for connecting fuel lines with hosing is shown in
Figure 14.
Ensure that there are no leaks.
Correct
Clip
Wrong
Bubble
Fig. 14: Pipe / hose connection
7.5. Metering pump
The metering pump is a combined delivery, metering and shut-off
system and is subject to certain installation criteria (see Figures 9, 15
and 16).
7.5.1. Installation location
The metering pump must be installed in a cool place as close as
possible to the tank (see Figure 9). The maximum ambient temperature
must not exceed +20 °C for petrol heaters at any time during operation.
The metering pump and fuel lines must not be installed within range of
the radiated heat from hot vehicle parts. A heat shield must be used if
necessary.
50
Air Top 3500 ST / Air Top 5000 ST 12 Volt - petrol
Fig. 15: Metering pump DP 2
Bubble
Air Top 3500 ST / Air Top 5000 ST
12 V and 24 V – diesel
Fig. 16: Metering pump DP 30.2/30.3
Air Top 3500 ST / Air Top 5000 ST
Preferably
15° - 90°
Installation position
Installation position