BRP-Rotax
INSTALLATION MANUAL
ATTENTION
An installation without fine filter may have a significant impact on the proper functional-
ity of this engine.
FUEL PUMP
For reducing the risk of vapor lock, the fuel pump should be placed in a good ventilated
area. A recommended installation position would be near the fuel tank in order to ensure a
safe fuel supply.
FUEL PRESSURE SENSOR
The operating limit of the fuel pressure should be observed at the inlet of the fuel pressure
regulator.
An additional fuel pressure sensor could be placed before the fine filter, so the filter load
can be checked. An increase of fuel pressure over the allowed limit could mean that the
fine filter is becoming contaminated. The fine filter should be checked and replaced if
necessary.
FUEL PRESSURE REGULATOR
Fuel pressure regulators have very precise tolerances and are generally reliable. Mostly
pressure fluctuations are not caused by the pressure regulator, they might be searched in
other sections (filter clogged, pulsation of lines, kinks in the hoses etc.) of the fuel system.
FUEL TANK
In case of supply problems of the fuel pump, the fuel tank should be emptied and filled with
AVGAS. If the problem does not occur at the next test (with AVGAS), then this is a sign of
formation of vapour locks when using MOGAS (or auto fuel).
Following points may have a positive impact on the proper functionality of this engine:
• Single tank (large volume of fuel in the tank, just a few fuel lines)
• Catch tanks in the wing tanks. This provides the fuel supply in every flight situation/
position
• Header tank (the following reference values should be considered):
Interface Parameter
Specification
Venting line
The venting line from header tank to wring tank
should generally be on an incline to avoid trapping
bubbles. The venting line must have an inner diame-
ter of at least 12 mm (0.50 in).
Feed lines
Fuel feed lines from the wing tanks to the header
tank should be on a steady decline.
Following points may have a negative impact on the proper functionality of the engine:
Effectivity: 915 i A Series
Edition 0/Rev. 0
Page 11
December 01 2017
Summary of Contents for 915 iS 3 A
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