Fuel System - Rotax 447 UL SCDI Installation Manual

15)

Fuel System

Schematic arrangement, 1 carburetor version
02940
fig. 28
Fuel contamination is a major cause of engine failure. The best place to avoid
contamination is at the source. Once fuel is in your container, a very harzardous
potential exists.
Use a clean safety approved storage container. Filter all fuel entering and leaving this
container. Do not over-fill container, allow for expansion.
▲ WARNING: Gasoline is flammable and explosive under certain conditions.
The carburetor(s) is (are) supplied with fuel by the fuel pump provided with the engine.
The pump is actuated pneumatically via an ,impulse line leading from the nipple on the
crankcase to the fuel pump. This line should not be longer than 500 mm (20 in.) and
must be of stiff and fuel-resistant material.
The fuel pump should be installed in a cool place (not on the engine itself),with the
small drain hole near the impulse connection towards the bottom. This hole drains oil
condensate from the pump diaphragm chamber.
If possible, the pump should be located below the fuel tank level.
If the fuel tank is considerably lower than the engine, an electric pump should be used.
This pump is to be connected in parallel as in case of series-connection the fuel
pressure would be excessive.
Effectivity: 447 UL SCDI, 503 UL DCDI, 582 UL DCDI /mod. 99
AIRCRAFT ENGINES
INSTALLATION MANUAL
Always perform fueling procedures in a well ventilated area. Do not
smoke or allow open flames or sparks in the vicinity. Never add fuel
while engine is running.
Schematic arrangement, 2 carburetor version
02941
fig. 29
Initial issue, May 01/99
page 15 - 1