Checking The Main And Fuel Pump Relay (Fuel Control); Checking The Solenoid Valve - Yamaha F50F Service Manual

NOTE:
After the engine start switch is turned to ON,
the electric fuel pump will operate for 3 sec-
onds.
Checking the main and fuel pump
relay (fuel control)
1. Remove the main and fuel pump relay
1.
2. Connect the digital circuit tester leads to
the relay terminals 2 and 3.
3. Connect the positive battery terminal to
the relay terminal 2.
4. Connect the negative battery terminal to
the relay terminal 4.
5. Check for continuity between the relay
terminals. Replace if there is no continu-
ity.
6. Check that there is no continuity between
the relay terminals after disconnecting a
battery terminal from the relay terminal
2 or 4. Replace if there is continuity.
6C13G11
Ignition and ignition control system / Fuel control system
1
S6C18120

Checking the solenoid valve

1. Connect the special service tool to the
2. Apply the specified negative pressure to
1
3. Check that the solenoid valve opens and
S6C18090
2
3
4
4
2 3
solenoid valve.
the solenoid valve.
Vacuum/pressure pump gauge set:
90890-06756
Specified negative pressure:
67 kPa (0.7 kgf/cm
the negative pressure is released when
the battery voltage is applied to the sole-
noid valve terminals 1.
Solenoid valve resistance
(reference data):
30.0–34.0 Ω at 20 °C (68 °F)
1
2
3
S6D88120
4
5
2
, 9.7 psi)
6
7
1
8
S6C18130
9
8-14