Fuel System - Rotax 914 F Maintenance Manual

9.2)

Fuel system

See Pic. 11.
The fuel system comprises the following items:
fuel tank
coarse filter
water trap
fire cock
2 electric fuel pumps
2 check valves
and the required fuel piping and connections
The fuel flows from the tank via a combination of filter and watertrap Q to the two
electric fuel pumps (W and E), connected in series, passes on to the fuel pressure
regulator T and further on to the individual carburetors.
Parallel to each fuel pump a separate check valve R is installed.
NOTE:
Via the return line U the surplus fuel passes from the fuel pressure regulator back to
the tank or to suction side of fuel system.
NOTE:
5
00103
Date
Page
1997 02 01
32
The arrangement of the two fuel pumps connected in series yields
better reserves against vapour formation at high altitudes and tem-
peratures.
The two check valves in the system are necessary to warrant trouble
free operation of the fuel system with one pump only.
The fuel pressure regulator serves to maintain the fuel pressure
always approx. 0,25 bar (3,6 p.s.i.) above the changing boost pres-
sure in the airbox thus warranting proper operation of the carburetor.
3
AUX
4
Legend:
Q coarse filter / water trap
W main fuel pump
E auxiliary fuel pump
Main
914 F
Pic. 11
2
MAIN
4
R check valve
T fuel pressure regulator
Y feeding line from tank
U return line to tank
Reference
7
1
6
Modification no.
- 0 -