d04923.fm
INSTALLATION MANUAL
BRP-Powertrain
Effectivity: 912 Series
Edition 2/Rev. 0
73-00-00
page 14
August 01/2012
2.1.2) Drainage piping on carburetor
General note The primary function of the carburetor float chamber venting lines, is to
provide ambient air pressure to the float bowl chambers. However, it is
possible for fuel to be expelled from these lines. Normally these lines are
connected to fitting on the ROTAX airbox to provide the ideal ambient air
pressure and away of draining any expelled fuel overboard.
Drainage piping If an airbox is not installed, the vent lines will need to be routed according
to the following instructions:
- The lines have to be routed such that in case of fuel being expelled it is
drained off suitably.
- Route the lines without kinks and avoid tight bends.
- Route the lines with a continuous decline.
- The lines have to be protected against any kind of blockage e.g. by for-
mation of ice.
The carburetor float chamber venting lines have to be
routed into a ram-air and vacuum free zone (or into the
airbox, according to the release of BRP-Powertrain.
These lines must not be routed into the slipstream or
any other location that is subject to ram-air or vacuum
during flight or ground operations.
Pressure differences between intake pressure in the
carburetor float chamber may lead to engine malfunc-
tion due to incorrect fuel supply.
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