d04923.fm
INSTALLATION MANUAL
BRP-Powertrain
Effectivity: 912 Series
Edition 2/Rev. 0
73-00-00
page 24
August 01/2012
The airbox is furnished with 2 drain holes (2) at the lowest position possi-
ble.
The holes are necessary to drain fuel from flooding float chambers
caused by badly closing float valve.
Drainage lines:
Requirements Observe the following requirements!
Non-compliance can result in serious injuries or
death!
Connect draining lines without fail, otherwise emerg-
ing fuel could drip onto the exhaust system. RISK OF
FIRE!
With closed or blocked drainage bores fuel could flow
into combustion chamber, possibly ruining the engine
by hydraulic lock or emerging fuel could drip onto the
exhaust system. RISK OF FIRE!
Step Procedure
1 The lines have to be routed such that in case of damage the surplus fuel is
drained away suitably.
2 Route the lines without kinks and avoid narrow bends.
3 Route the lines with a continuous decline.
4 The lines have to be protected against any kind of blockage e.g. by formation
of ice.
The drainage lines (2) have to be routed into a ram-air
and vacuum free or into the airbox, according to the
requirements and release of BRP-Powertrain. See
also chap. Carburetor. These lines must not be routed
into the slipstream. If the drainage lines of the airbox
are connected with the drainge lines of the drip trays
or the carburetors by a T-piece, these lines must not
be routed down the firewall (drainage lines of the
airbox separately are allowed).
Pressure differences between intake pressure and
pressure in the carburetor chambers may lead to
engine malfunction due to incorrect fuel supply.
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