Webasto Air Top 3500 ST Installation Instructions Manual page 19

Air Top 3500 ST / Air Top 5000 ST Fuel supply
7.5.2. Installation and attachment
The metering pump must be secured with a vibration-damping mounting
(for example a rubberised clip). Its installation position is limited as
shown in Figures 15 and 16 in order to ensure effective automatic
bleeding.
As a result of the risk of corrosion, only genuine Webasto parts may be
used for the plug connections between the metering pump and the
metering pump wiring harness.
7.6. Fuel filter
Only a Webasto filter, order no. 487 171, is allowed to be used if the fuel
is expected to be contaminated. Install vertically if possible, however at
least horizontally (check flow direction).
0° - 90°
Fig. 17: Air Top 3500 ST and Air Top 5000 ST fuel filter
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