Effectivity 912 Series
Edition 1 / Rev. 0
page 35
May 01/2007
d02623
73-00-00
BRP-Rotax
Maintenance Manual
3.4.1) Fuel pressure (on 912 Series)
See Fig. 73-28.
The pressure inside the fuel system must not exceed 0.4 bar (5.80
p.s.i). Normally, it will lie between 0.15 (2.18 p.s.i) and 0.3 bar (4.4
p.s.i). The fuel pressure tester, part no. 874230, can be used to
measure the pressure and check the correct functioning of the fuel
system.
Installation of the fuel pressure testing device
Connect the pressure gauge (1) with the hose (2) to the 4-fold nipple
(3) instead of the fuel return line. Fit the pressure gauge where it can
be easily observed by the operator of the ground test run.
â– CAUTION: Make sure there is no danger that the pressure gauge
and hose will get drawn into the propeller airstream. If
necessary, secure with tie wraps.
If the nominal fuel pressure values are not met during the test run, stop
the engine and start with the trouble shooting procedure.
â–² WARNING: No aircraft take-off before an obvious fault has been
found and eliminated!
â– CAUTION:
- Fault free operation of the carburetors cannot be guaranteed if the
fuel pressure is below 0.15 bar (2.18 p.s.i)or above 0.4 bar (5.80
p.s.i) l. If the minimum required fuel pressure cannot be achieved,
it is necessary to use an additional electric fuel pump.
- There must be a suitable fuel filter with 0.1 mm (0.004 in.) mesh size
between the fuel tank and the fuel pump. Do not use paper filters.
- Select fuel lines in accordance with national aviation regulations.
They should have a minimum crosssection of 5 mm (0.2 in.).
- The tank must be fitted with a fuel cock (with a screen) to allow
immediate interruption of the fuel supply at any time.
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