Fuel Supply; Removing Fuel From Vehicle Fuel Tank; Vehicles With Fuel Injection Engines - Webasto Air Top Evo 40 Installation & Operation Manual

Fuel Supply

6. Fuel Supply
The fuel is taken from the vehicle fuel tank or from a
separate fuel tank. The values for the maximum pressure at
the fuel extraction point are shown in below.
Parameter
Inside diameter of fuel line
L
Length of fuel line (intake side)
1
L
Length of fuel line (pressure side)
2
L + L
Total length of fuel line
1 2
Height difference between heater and fuel pump
H
1
(Heater above fuel pump)
Height difference between heater and fuel pump
H
2
(heater below fuel pump)
Fuel level (tank above fuel
pump), h1 [M]
h = 0
1
h = 0 to 1
1
h = 1 to 2
1
Fuel level (tank below fuel
pump), h2 [M]
h = 0 to 1.3
2
A sign must be affixed to the fuel tank's filler neck warning that the heater must be switched off before refueling. Affix
the following sticker "Switch Off Heater Before Refueling" (included in scope of delivery) in area of fuel filler neck.
6.1

Removing fuel from vehicle fuel tank

The fuel extractor must be fitted in such a way that any air or gas bubbles are automatically discharged towards the
tank (see Figure 13).
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.
6.2

Vehicles with Fuel Injection Engines

When installing the heater in a vehicle with fuel injection system, it is important to establish whether the fuel pump is
located inside or outside the tank.
Webasto Thermo & Comfort N.A., Inc.
Value
2 mm
Max. 5 m
Max. 10 m
Max. 12 m
Max. 3 m
Max. 1m
Maximum permissible fuel pres-
sure at take-off point, p [bar]
-0.1 to +0.5
-0.1 to +0.4
-0.1 to +0.3
Maximum permissible fuel pres-
sure at take-off point, p [bar]
-0.1 to +0.5
Figure 11. Fuel Supply
p [bar]
p (bar)
h [m]
1
L
1
0
L
1
h [m]
2
p (bar)
16
Air Top Evo 40/55
L
2 H [m]
1
0
L
H [m]
2
2
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