O.S. Engines FS-91 II FI - Manual (Page 12)

12
F S
SERIES
MADE IN JAPAN
10-15mm
A fuel tank of approximately 450cc capacity is suggested. This allows up to 14-15 minutes flying time,
dependent upon the type of fuel used, the size of the propeller and on the proportion of full-throttle to part-
throttle operation through the flight. Make sure that the tank is well rinsed out with methanol or glow fuel
before installation and that the pickup weight is well clear of the bottom of the tank when held vertically
(see sketch). To prevent the pickup from adhering to the tank wall under suction and restricting fuel flow,
slots may be filed in the end of the weight as shown. Alternatively, a Bubbless type weight (Code No.
71531000) may be used.
Make connections in the following order: Engine (carburetor nipple), check valve (provided),
T nipple and fuel tank (air chamber side)
Make connections in the following order: Injector, fuel filter (provided), T nipple and fuel tank
(weighted side)
NOTE:
Always make sure to release any pressure remaining in the tank when adding fuel and
following engine operation.
Silicon tubing is easily damaged by sharp objects that can lead to the formation of holes and
cracks. Check the surrounding area of the presence of potentially harmful sharp objects.
Fig.6
Connect all lines securely as shown in the figure above. Since high pressure is applied to the fuel
tank from the engine crankcase, make connections using a commercially available, thick-walled
silicon tube. In addition, make sure to securely seal the area around the cap. If the outlet of the T
nipples is left accessible from outside the airplane, it will make venting tank pressure and refueling
easier. Always make sure to use the check valve and fuel filter provided.
(3) Fuel Tank and Lines
Check valve
(provided)
Fuel
supply line
Tank pressure
ven line
T nipples (sold separately)
Fuel filter (provided)
Caps (sold separately)