2) Fuel Pressure Control; Notes On Checking Of Fuel Pressure - Rotax 914 F Installation Manual

14.4.2) Fuel pressure control

Connections: inlet Q (feed line from fuel pumps) and
3
Ill. 33

14.5) Notes on checking of fuel pressure

Ill. 34
2
4
1
3
5
Date
Page
1996 05 10
52
See outline of fuel pressure control E ,Ill. 30 and Ill. 33.
outlet W (fuel return to tank)
hose nipple ..............................4/6 DIN 7642
outside dia. ø ........................... 8 mm (5/16")
slip-on length .................. max. 20 mm (3/4")
tightening torque of the
banjo bolts E .M10x1x19: 17 Nm (150 in.lb)
2
ATTENTION:
The fuel return from connection W must be a line of low flow
resistance. Prevent any restrictions of section or blockage,
otherwise the carburetor could flood.
1
ATTENTION:
3
Utilize the full slip-on length at hose joints. Secure hose with
suitable screw clamp or by crimp connection.
NOTE: The control of the fuel pressure is achieved by a valve
activated from a diaphragm. Reverence pressure is the
boost pressure in the airbox.
The arrows on top of the fuel pressure control are of no
significance for this application.
See Ill. 34.
There is no standard connection provided to measure the full pressure. For
general observation and at engine troubles fuel pressure readings would be
helpful.
A feasible connection would be an additional hose nipple 4/6 Q joined to the
fuel line W.
remove banjo bolt M10x1x19. Fit additional hose nipple (with inte-
grated orifice) Q and 2 sealing rings E by use of a longer banjo bolt
R M10x1x30.
tightening torque of the banjo bolt: 17 Nm (150 in.lb).
ATTENTION: At tightening of the fuel lines W support the specific line,
to prevent any internal stresses.
NOTE: The illustration 34 shows the additional hose nipple
connected to fuel line of carburetor 1/3. The additional
nipple can be fitted of course to any other connections
with the exception of outlet T.
All the necessary items are available as spare parts.
Install
914 F
Reference Modification-No.
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