Fuel Pump System; Troubleshooting - Saito FA-120 Special Instruction Manual

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C A R B U R E T O R M A I N T E N A N C E
Tips For Extended
Engine Life
To add longer life to your Saito
™
engine the following recommendations
are made:
1. Use a high-quality fuel containing
20% lubricants.
2. Use recommended glow plugs.
3. Use the proper propeller size and
balance the propeller prior to use.
4. Use a tachometer for precise engine
adjustments.
5. Use an "after-run" oil when you're
finished flying for the day. Hangar 9
After Run fuel is recommended.
6. For long-term storage, make sure
there is no fuel left in the tank and the
engine. Remove the glow plug(s) and
apply several drops of high-quality
light oil (e.g., a good quality light
machine oil or Marvel Air Tool Oil)
to the top of the engine, into the glow
plug hole, down the pushrod tubes, and
through the crankcase pressure vent
breather nipple). Rotate the crankshaft
several times. Store the engine in
the box or on the airplane with the
nose down in order to keep oil in the
bearings.

Troubleshooting

Generally speaking, there are very
few things that will keep today's
modern glow engines from starting.
To that end, make sure you're using
good quality "fresh" fuel, there are
good glow plugs installed, and the
starting battery is charged and in good
condition. Should the engine fail to
start after these items are verified,
refer to the troubleshooting chart on
page 12.
®
Optional Fuel Pump
System
When operating the FA-220a/GK
engine with a remote fuel tank it may
be necessary to use the optional fuel
pump system, (SAI220a102). The
fuel pump system provides additional
pressure to the fuel tank from the
crankcase one-way vent valve. See the
installation diagram included with the
pump system for the proper fuel line
hook-up procedure.
For initial operation with the remote
fuel tank and fuel pump system, open
the pump system needle valve 2¾
turns and start the engine.
1. Begin with the pressure adjusting
valve open 2¾ turns.
2. Start the engine and allow it to
warm up prior to attempting any
adjustments.
3. Advance the engine to full throttle.
4. Rotate the pressure adjusting
valve in ¼ turn increments—first
clockwise ¼ turn (rich) then rotate
counterclockwise ¼ turn (lean)
until the best rpm is achieved. It is
important to note that the pump system
has a definite response lag. This lag
is approximately 2–5 seconds. With
each ¼ turn change of the pressure
adjusting valve, allow the engine
rpm enough time to stabilize.
This will prevent "chasing" of the
correct setting.
T R O U B L E S H O O T I N G
5. It may be noted that the Pump
Pressure needle setting will operate
anywhere from 2 ½ turns open to
6 turns open. The final setting will
depend largely on the specific fuel
tank location and choice of propeller.
The fuel tank must not have any
leaks as the pump system operates by
increasing the pressure in the fuel tank.
Check all connections for leakage or
obstruction before initial operation
with the fuel pump system. Other
operation will be similar to running the
engine with muffler pressure.
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