INSTALLATION MANUAL
AIRCRAFT ENGINES
page 15 - 2
Initial issue, May 01/99
Effectivity: 447 UL SCDI, 503 UL DCDI, 582 UL DCDI /mod. 99
d00325
The electric pump must produce a pressure of minimum 0,2 bar (3 psi), and together
with the pneumatic pump max. 0,5 bar (7 psi) resp. max. 0, 4 bar (6 psi) in case of a
diaphragm carburetor, and must allow free flow-through, even when switched off.
A suitable fuel filter of 0,15 mm mesh size must be fitted between pump and
carburetor. Do not use paper filters. The fuel tank must have a drain cock for
condensed water. A screen of 0,3 mm mesh size should be fitted to the fuel line in the
tank. Never restrict the normal fuel flow.
The fuel lines and impulse line must be of a type to comply with national regulations.
The minimum diameter is 5 mm (0,2 in.).
If the fuel tank is placed higher than the carburetor, the tank connection must have
a fuel cock (with filter) to shut off the fuel supply when the engine is not running.
▲ WARNING: The carburetor needle valve is not sufficiently tight to seal for a
prolonged period of time and during transport.
National regulations may require a fuel cock to be fitted even if the fuel tank is below
the carburetor.
The carburetor needle valve is not to be used as a fuel cock.
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