Installation Manual 447-503-582 Rev.0 05/1999 - Rotax
Contents
1. d00325 ROTAX AIRCRAFT ENGINES INSTALLATION MANUAL 15 Fuel System Schematic arrangement 1 carburetor version Schematic arrangement 2 carburetor version p 7 q q ei 02941 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 A WARNING Gasoline is flammable and explosive under certain conditions 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 The carburetor s is are supplied with fuel by the fuel pump provided with the engine The pumpis 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 Ifthe fuel tank is considerably lower than the engine an electric pump should be used This pu2. mp 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 page 15 1 Initial issue May 01 99 ROTAX AIRCRAFT ENGINES INSTALLATION MANUAL 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 A 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 Effectivity 447 UL SCDI 503 UL DCDI 582 UL DCDI mod 99 page 15 2 Initial i
3. ssue May 01 99 d00325
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