O.S. Engines 91SZ-H PS Hyper - Manual (Page 11)

20
ABOUT THE PUMP SYSTEM
CARE OF FUEL PUMP AND REGURETOR
NEVER disassemble the fuel pump or pressure
regulator. Their original performance may not be
restored after reassembly.
NEVER insert anything into the inlet or outlet nipples
in an attempt to clear a suspected obstruction.
ALWAYS use fuel filters. Keep the fuel tank scru-
pulously clean and filter all fuel as it enters the tank
(e.g.via an O.S.'Super-Filter' Code No.72403050)
and use a good quality in-line filter between the
tank and pump. Remember to inspect filter screens
at regular intervals and rinse clean as necessary.
Do not clean the pump with organic solvent such
as kerosene, light machine oil, gasoline, thinner or
crc or the silicone rubbur parts inside is
detoriorated. Be sure to use methanol or fuel.
Do not allow fuel to remain in the pump. After
finishing the day's flight session, be sure to run out
the fuel in the pump. Stop the fuel flow to the pump
with a stopper and run the engine at idling to use
up the fuel in the pump. After stopping the engine,
rotate the engine by electric starter to eliminate
fuel inside the engine.
DO NOT allow foreign matter to enter the fuel
system. Dirt inside the pump or regulator, no matter
how small, may obstruct the flow of fuel and
prevent these components from working properly.
DO NOT obstruct the small rectangular hole at the
bottom of the regulator, nor the regulator will not
function correctly.
Fuel passing direction is set in the pump. Do not
mistake piping.
Coming in (IN)
Going out (OUT)
(Connect to regulator nipple.)
Rectangular hole
21
ABOUT THE PLUMBING
muffler pressure
Silencer
Fuel tank
Pump
Fuel Stopper
(commercially available)
Fuel Filter
(commercially available)
Follow the procedure shown. Connect silencer pressure nipple to fuel tank after installing
the engine and the silencer in the model according to the
instructions supplied with the model. Connect fuel tank to 'IN'
nipple of the PD-07 pump and 'OUT' nipple of the pump to the
regulator nipple. It is recommended to install a good in-line
filter between the fuel tank and the PD-07 pump to prevent
entry of foreign matter into the carburetor.
Piping 1