O.S. Engines 65AX - Manual (Page 11)

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Suggested fuel tank capacity is approx
350cc. This will allow 10-12 minute flights.
FUEL TANK LOCATION
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.
Use a suitable length of best quality 5mm
OD x 2.5mm ID silicone tubing for fuel
tubing.
Be sure to use a pressurized fuel system by
connecting the muffler pressure nipple to the
vent-pipe of the fuel tank.
The Fuel line pickup weight should be 10mm
away from the back of the tank.
Position the fuel tank so that approximately
1/3 of the tank height is above the center line
of the needlevalve.
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Attention to tank height
Plug (commercially available)
For carburetor
Approx. 10mm
Approx.
1/3 Carburetor Center Line
Locate the fuel tank as close to the engine as possible to minimize fuel
level pressure variation.
For Silencer
Approx.
2/3