73-00-00
page 8
May 01/2007
Effectivity 914 Series
Edition 1 / Rev. 0
d02623
BRP-Rotax
Maintenance Manual
00117
fuel return
fuel feed
2.6) Fuel pressure regulator (only on 914 Series)
See Figs. 73-3 and 73-4.
The fuel pressure regulator (1) is mounted on the airbox.
Fuel pressure control is essential for flawless engine operation because it keeps
the fuel pressure permanently at approx. 0.25 bar (3.6 p.s.i.) above the varying
boost pressure in the airbox.
Design and function of the fuel pressure regulator:
The diaphragm (2) divides the pressure regulator into the top fuel chamber (3)
and the air chamber (4). The force of the pressure spring, which is set by the
adjusting screw (5) establishes an equilibrium of forces on the diaphragm at a
fuel pressure 0.25 bar (3.6 p.s.i.) above the actual airbox pressure on the other
side.
â– CAUTION: All fuel pressure regulators are calibrated by the engine manu-
facturer and need no further adjustment or maintenance.
â—† NOTE: The arrows cast into the top side of the fuel pressure regulator
are of no significance for the usage, as inlet (6) and outlet (7) are
directly connected via the chamber.
â—† NOTE: Ensure that the cap nut (8) is securely tightened, as otherwise
the fuel pressure may drop.
00104
fuel return
carburetor
airbox
6
7
8
1
2
3
4
5
Fig. 73-3
Fig. 73-4
7
8
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