Webasto Thermo Top Z Notice De Montage page 46

Fuel system integration (additional heater only)
8.4.1. Installation location
Before installing the metering pump ensure that the maximum pressure
at the extraction point is less than the maximum value shown in the table
on page 39.
It is advisable to install the metering pump in a cool place. The maximum
ambient temperature must not exceed +20 °C 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.
The pump should ideally be installed near the tank.
8.4.2. Installation and attachment
The metering pump must be secured with a vibration-damping
mounting. Its installation position is limited as shown in Figures 10
and 11 in order to ensure effective automatic bleeding.
8.5. Sticker
The sticker "Switch off heater before refuelling" must be affixed at a
suitable point.
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Thermo Top Z / Thermo Top C