Fuel Tank & Lines - O.S. engine FL-70 Owner's Instruction Manual

FUEL TANK & LINES
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.
Connect between pressure nipple on the
silencer (larger hole one) and the tank to
apply muffler pressurized fuel feed system
which deliver the fuel stably reducing fuel
level negative effect.
Connect between breather nipple on the
cover plate and silencer breather nipple
(smaller hole one).
General Piping
Make connections as shown in the Fig.1.
An airbleed type carburetor is required to set
idling r.p.m. a little higher to prevent engine
cutting.
Piping suitable for acrobatic flights
With the general piping, the fuel in the tank
may flow into the silencer when the throttle is
set to slow during upside-down flight or
vertical dive, which may result in engine stop
due to mixture change at low speed. Piping
shown in the Fig 2 prevents fuel flowing into
the silencer, and engine stop at slow running
during maneuvers. Also, this piping allows to
set the idling r.p.m. a little lower and longer
flight by preventing excess fuel flowing out.
When the tank is filled (when the fuel level is
higher than the carburetor center line.),
prevent the fuel flowing into the carburetor
with a commercially commercially available
fuel stopper, etc. Release the stopper before
starting the engine.
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