Fuel Shut Off Solenoid; Testing Solenoid; Testing Equipment Wiring; Testing Engine Wiring - Briggs & Stratton 405777 Series Manual

FUEL SHUT OFF SOLENOID

The fuel shut off solenoid is controlled by the equipment ignition switch. When the equipment switch is in the "Off" position, the
solenoid valve plunger closes, stopping fuel flow through the fixed main jet. When the switch is in the "On" and "Start" position,
the solenoid valve opens, allowing normal fuel flow. Solenoid is operating properly if a click is heard when equipment ignition
switch is turned "On" and "Off."
Note: Anti-afterfire solenoid requires a minimum of 9 volts DC to function.

TESTING SOLENOID

If solenoid does not click, the problem may be in equipment
wiring, engine wiring harness or solenoid. To determine
whether problem is with wiring or solenoid, perform the
following tests in the order shown.
Test Equipment
The digital multimeter, Tool #19390 is required to test the
solenoid equipment wiring.
The following tests will be performed with the meter in the
(DC volts) position, Fig. 30.
V

TESTING EQUIPMENT WIRING

1. With keyswitch in OFF position, disconnect equipment
wiring harness connector from engine wiring harness.
2. Attach red meter test lead into equipment wiring harness
connector. (side opposite raised rib)
3. Attach black test lead to a good ground, Fig. 31.
4. Turn keyswitch to ON position.
a. Meter should display battery voltage at connector.
If meter does not display battery voltage, problem is with
wiring harness. Check for loose or broken wire. If meter
displays battery voltage, test engine wiring harness.

TESTING ENGINE WIRING

1. With keyswitch in OFF position, re-connect equipment
wiring harness to engine wiring harness and disconnect
harness at solenoid.
2. Insert red meter test lead into GRAY wire in solenoid con-
nector.
3. Attach black test lead to a good ground, Fig. 32.
4. Turn keyswitch to ON position.
a. Meter should display battery voltage at connector.
If meter does not display battery voltage, problem is with
engine wiring harness. Replace. If meter displays battery
voltage, problem is with solenoid. Replace solenoid.
10
TSM
Fig. 30
EQUIPMENT WIRING HARNESS
CONNECTOR
Fig. 31 − Checking Wiring
SOLENOID CONNECTOR
GRAY WIRE
Fig. 32 − Checking Wiring