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Fuel
8
Fuel Integration
The fuel filler must not be situated in the passenger compartment and must
be provided with an effective cap to prevent fuel spillage. (Requirement
from ECE R122, Point 5.3.3.1.).
In the case of liquid fuel heaters, where a supply separate from that of the
vehicle is provided, the type of fuel and its filler point must be clearly la-
belled. (Requirement from ECE R122, Point 5.3.3.2.).
8.1.
Integration in engine supply or return line
The fuel integration is carried out either in the supply or return line, or with
a special fuel standpipe. On vehicles with a fuel pump, the fuel may not be
removed from the fuel supply line!
– If the vehicle has a check valve to the fuel tank, fuel may not be removed
from the return line.
– It must be ensured that no zero balance results in the vehicle system due
to the fuel removal.
– If fuel is removed from the swirl pot, it must be ensured that this pot is
not completely drained.
Proper installation is carried out as shown in fig. 8: Example of a fuel stand-
pipe.
Legend:
33) from tank
34) to metering pump
35) to engine
26
8.2.
Integration via fuel removal unit
Also see chapter 6, "Example of Installation in a Passenger Car"
The fuel standpipe is installed in the fuel removal unit of the fuel tank. See
fig. 9.
Legend for fig. 9:
31) Fuel standpipe
32) Fuel removal unit with hole
The installation surface of the fuel standpipe must be clean, flat and burr-
free. When mounting the fuel standpipe in the fuel removal unit, ensure
careful routing of the standpipe. This may not impair the operation of the
parts of the fuel removal unit including the fuel gauge in any operating
mode. The length of the standpipe must be chosen so that a minimum dis-
tance of 10 mm over the fuel tank bottom or 20 mm over the bottom of
the fuel removal unit is ensured.
The specified securing measures of the vehicle manufacturer and the cor-
responding torques must be complied with.
The fuel standpipe must always be installed in the fuel tank clo-
sure plate and never directly into the body of the fuel tank.
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