Vanguard
TM
Twin-Cylinder OHV Liquid-Cooled Engine
Section 2 - Troubleshooting
Page 17
Testing Equipment Wiring
1. With keyswitch in
OFF position, disconnect
solenoid wire (GRAY WIRE) from engine wiring
harness connector (WHITE WIRE).
2. Insert red meter test lead into equipment side of
wiring harness connector (WHITE WIRE) , Fig.
17.
3. Attach black test lead to a good ground .
4. Turn keyswitch to
ON position.
a.Meter should display battery voltage at
connector.
Fig. 17
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 Solenoid
A pair of jumper wires and a 9 volt transistor battery are
required for this test.
1. Attach one jumper wire to solenoid wire
(GRAY WIRE) and positive terminal on battery
, Fig. 18.
2. Attach second jumper wire to negative terminal on
battery and a good ground .
3. Solenoid should “click”.
4. If solenoid does not “click”, it is defective. Replace.
Fig. 18
FUEL PUMP - GENERAL INFORMATION
The fuel pump, mounted on the No. 1 cylinder fan
bracket, allows remote fuel tank installations. The fuel
pump will prime at
12” (30.5 cm) maximum lift. Fuel pump
pressure is
1.5 psi (0.1 Bar). The pump is operated by
pulsating crankcase vacuum from the engine. The
vacuum pulse line is installed on the No. 1 cylinder valve
cover, Fig. 19.
Fig. 19
NOTE: An air leak at the fuel pump pulse line
hose connections will result in improper fuel
flow.The fuel pump is available as an assembly
only.
Replace fuel lines and vacuum pulse line if stiff and
brittle.
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