Fuel Pump - Vanguard OHV V-Twin User Manual

5. Lift the fuel tank. Disconnect the fuel hose from
the carburetor fuel inlet (6), Fig. 10. Remove the
fuel valve shut-off knob from the shut-off link (7).
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Fig. 10
6. Remove the fuel tank.
Installation
1. Hold the fuel tank above the engine. Connect
the fuel hose to the carburetor fuel inlet. Insert
the fuel valve shut-off knob to the shut-off link.
2. Put the fuel tank in position. Install 2 shoulder
bolts to each side of the tank. Torque the
shoulder bolts to 140 in. lbs. (16 Nm).
3. Install the air cleaner element, top plate and
nut.
4. Install the air cleaner cover. Secure the cover
with the air cleaner cover knobs.

Fuel Pump

General Information
NOTE: Some applications use an OEM supplied
remote fuel pump. These engines are
manufactured without a fuel pump.
The fuel pump allows for remote fuel tank
installations. Fuel pressure is 1.5 psi (0.1 Bar). The
pump will prime at 12" (30.5 cm) maximum lift.
CAUTION: Excessive fuel pressure can result in an
over-rich carburetor mixture and ultimately cylinder
scoring and/or other engine damage, resulting from
gasoline diluting the crankcase oil. FUEL PUMP
PRESSURE MUST NOT EXCEED 1.5 psi (0.1 Bar).
78
All Except Models 540000, 610000
The fuel pump is actuated by pulsating crankcase
vacuum from the engine. The vacuum pulse fitting (2),
Fig. 11 is installed on the No. 1 cylinder valve cover.
‡
NOTE: A leak at the vacuum pulse hose or its
connections will result in improper fuel flow.
Inspect the fuel hose from the fuel tank (3), the fuel
hose to the carburetor (1) and the vacuum pulse
hose. Replace any hose that is stiff or brittle.
NOTE: The fuel pump is available only as an
assembly.
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Models 540000, 610000
The fuel pump (3), Fig. 12, is actuated by a lobe on
the camshaft. Inspect the fuel hose (2) from the fuel
tank to the pump and the hose from the pump to the
carburetor (1). Replace fuel hoses if stiff or brittle.
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NOTE: Parts removed for clarity. The fuel pump is
available only as an assembly.
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Fig. 11
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Fig. 12
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