Anti-Afterfire Solenoid; Test Anti-Afterfire Solenoid; Test Solenoid - Briggs & Stratton Vanguard 430000 User Manual

Anti-Afterfire Solenoid

Some carburetors are equipped with an anti-
afterfire solenoid 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 or high
speed nozzle. When the switch is in the ON and
START position, the solenoid valve opens, allowing
normal fuel flow. The solenoid is operating properly
if a click is heard when equipment ignition switch is
turned ON and OFF. If solenoid is not working
(defective solenoid or equipment wiring), the engine
will not start or run.
NOTE: Anti-afterfire solenoid requires a minimum of
9 volts DC to function.
NOTICE: Engines equipped with an anti-afterfire
solenoid are equipped with an air horn gasket with a
ground clip imbedded in the gasket (A, Figure 62).
An Anti-afterfire solenoid will not function if ground
clip is removed or damaged.
Figure 62

Test Anti-Afterfire Solenoid

If solenoid does not click, the problem may be in the
equipment wiring. To determine whether the
problem is with wiring, perform this test.
1. Set multimeter to the V== (DC volts) position
(Figure 63).
Figure 63
2. With keyswitch in OFF position, disconnect
equipment wiring harness connector from
solenoid.
3. Insert red meter test lead into wiring harness
connector and attach black test lead to
ground (Figure 64).
Figure 64
4. Turn keyswitch to ON position.
5. Meter should display battery voltage at
connector. Test solenoid.
6. If meter does not display battery voltage,
problem is with wiring harness, Check for
loose or broken wires.

Test Solenoid

1. Remove solenoid from carburetor.
2. Place either terminal of a 9 volt transistor
battery on the solenoid connector and other
terminal on body of solenoid or ground wire
(Figure 65).
3. Plunger should retract freely.
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