2003 YAMAHA FX fuel pressure

2-15
E
EJU19940
Yamaha Engine Management
System (YEMS)
This model is equipped with an inte-
grated, computerized management system
that controls and adjusts ignition timing, fuel
injection, engine diagnostics, and the Off-
Throttle Steering (OTS) system.
EJU01786
Multifunction meter
This meter contains the following func-
tions for help and convenience in operating
the watercraft.
1
Tachometer
2
Hour meter/Voltmeter
3
Speedometer
4
Fuel meter
5
Fuel warning indicator
6
Engine overheat warning indicator
7
Speedometer display select switch
8
Hour meter/Voltmeter display select switch
9
Check engine warning indicator
0
Oil pressure warning indicator
CAUTION:@ Do not run the engine for more than
15 seconds when checking the operation
of the meter on land. The engine could
overheat.
NOTE:@
When the engine is started, all displays
light up for 2 seconds and the buzzer
sounds 2 times. Then, the meter starts to
operate normally.

The current display will continue to oper-
ate for 25 seconds after the engine stops.
UF1B71.book Page 15 Tuesday, November 12, 2002 4:17 PM

2-18
E
EJU01792
Fuel warning indicator
If the fuel remaining in the tank drops to
about 13 L (3.4 US gal, 2.9 Imp gal), the
lowest fuel level segment and the fuel warn-
ing indicator begin to blink, and the buzzer
sounds intermittently.
If this occurs, fill the fuel tank at the first
opportunity.
EJU01793
Oil pressure warning indicator
If the oil pressure does not rise to specifi-
cation, the oil pressure warning indicator
come on and the buzzer begins to sound
continuously. At the same time, the engine
speed reduction control is activated.
If this occurs, reduce the engine speed,
beach the watercraft, and have a Yamaha
dealer check the oil pressure.
NOTE:@ Press any button on the multifunction meter
to stop the buzzer.
UF1B71.book Page 18 Tuesday, November 12, 2002 4:17 PM

3-6
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EJU01048
Pre-operation check points
EJU01878
Engine compartment
Ventilate the engine compar tment before
each use.
To ventilate the engine compartment
remove the rear and front seats. (See pages
2-5 and 2-6 for seat removal and installation
procedures.) Allow the engine compartment
to remain open for a few minutes to allow
any fuel vapors to escape. Also, check for
loose electrical connections.
WARNING@ Failure to ventilate the engine compart-
ment could result in fire or explosion. Do
not start the engine if there is a fuel leak
or a loose electrical connection.
EJU01802
Fuel level
Check the fuel system for leakage, cracks
or malfunctions before each use. (See page
4-10 for check points and correct proce-
dures.)
1. Remove the fuel tank filler cap to release
any pressure that might have built up in
the fuel tank.
2. Remove the rear and front seats. (See
pages 2-5 and 2-6 for seat removal and
installation procedures.)
3. Check the fuel level in the tank and
replenish if necessary. (See page 3-4 for
filling instructions.)
UF1B71.book Page 6 Tuesday, November 12, 2002 4:17 PM

5-2
E
Engine runs irregu-
larly or stallsFuel Empty Refill as soon as possi-
ble3-4
Stale or contaminated Have serviced by
Yamaha dealer4-10
Fuel tank Water or dirt present Have serviced by
Yamaha dealer4-10
Spark plug Fouled or defective Replace 4-16
Incorrect heat range Replace 4-16
Gap incorrect Adjust 4-16
Spark plug cap Loose Connect properly 4-16
Cracked, torn, or dam-
agedReplace
—
Electrical wir-
ingLoose connection Tighten or connect
properly—
Fuel injection
systemJet nozzle clogged Have serviced by
Yamaha dealer—
Warning light or
indicator blinksFuel level Empty Refill as soon as possi-
ble3-4
Engine over-
heatedJet intake clogged Clean
5-3
Check engine
warningFaulty sensors Have serviced by
Yamaha dealer—
Wate rcr af t slow or
loses powerCavitation Jet intake clogged Clean 5-3
Impeller damaged or
wornHave serviced by
Yamaha dealer—
Engine over-
heat warningEngine speed reduc-
tion control activatedClean jet intake and
cool engine2-19
Oil pressure
warningEngine speed reduc-
tion control activatedAdd oil
2-18
Spark plug Fouled or defective Replace 4-16
Incorrect heat range Replace 4-16
Gap incorrect Adjust 4-16
Spark plug
capsLoose Connect properly
4-16
Electrical wir-
ingLoose connection Tighten or connect
properly—
Fuel Stale or contaminated Have serviced by
Yamaha dealer4-10
Air filter Clogged Clean or replace 4-13
Oil buildup Replace 4-13 TROUBLE POSSIBLE CAUSE REMEDY PAGE
UF1B71.book Page 2 Tuesday, November 12, 2002 4:17 PM