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FUEL SYSTEM
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
B
Item
2
FUEL PUMP
The fuel pump is mounted on a bracket attached to the
seat support near the fuel tank. It is operated by crank-
case pressure impulses from the engine. As the piston
moves up in the cylinder, a negative pressure moves the
diaphragm within the fuel pump (1) (Ref. Fig. 8). This
movement draws fuel from the fuel tank into the fuel
pump chamber. This action also closes the outlet valve
which prevents fuel back flowing from the carburetor.
As the piston moves down in the cylinder, a positive pres-
sure is formed in the crankcase which causes the dia-
phragm to move in the opposite direction (away from the
engine). This action forces the inlet valve to close and the
outlet valve to open and supply fuel to the carburetor float
bowl.
Fuel Pump Replacement
Tool List
Socket, 3/8" ................................................................. 1
Ratchet ........................................................................ 1
Pliers............................................................................ 1
Straight Blade Screwdriver .......................................... 1
2
Fig. 8 Fuel Pump
Attempting to operate engine with
lines reversed will cause fuel to
enter the crankcase and dilute the
oil with fuel to enter the possible engine damage.
NOTICE: The length of the pulse hose from the fuel
pump is important for efficient pump operation. To
130
Torque Specification
50 - 70 in. lbs. (6 - 8 Nm)
1
Pulse Hose
Fuel Line
replace the hose, make sure to replace with a hose
of the same length and approved material.
Observe and identify the supply and pulse hoses.
Remove the hoses and plug the fuel lines (2). Remove
the fuel pump (1) by removing the two screws that secure
it to the bracket located on the seat support frame (Ref.
Fig. 8).
Installation is in the reverse order of removal. Be sure to
connect the pulse line to the correct location on the pump
(Ref. Fig. 8).
Fuel Lines and Filter
Tool List
Pliers ............................................................................1
Straight Blade Screwdriver ..........................................1
The fuel is supplied to the fuel pump and carburetor
through flexible fuel hoses. An in-line filter (1) is installed
in the hose between the fuel tank (2) and the fuel pump
(3) (Ref. Fig. 9).
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Remove the spark plug wire in order to prevent an
ignition spark that could ignite the fuel/vapor. Never
permit smoking or an open flame in an area that
contains fuel/vapor. Clean up all fuel spills immedi-
ately.
Frequently check the fuel filter (1), tank (2), hoses and
cap (3) for leaks or signs that the cap vent or filter have
become clogged. The filter must be replaced periodically
(Ref. Fig. 9).
Refer to SCHEDULED MAINTENANCE section.
tank. It must be replaced.
FUEL TANK REMOVAL
Tool List
Wrench, 5/16" ..............................................................1
Socket, 5/16"................................................................1
Ratchet.........................................................................1
Drip Pan .......................................................................1
Wear eye protection. Disconnect the negative (-) battery
wire. Turn off the fuel shut off valve (3). Disconnect the
fuel line (4) at the fuel pickup and the line to the CARB
canister (5), if the vehicle is so equipped. Monitor for fuel
leakage from the fuel line. Always use a drip pan. Dispose
Repair and Service Manual
If a test to determine fuel/vapor
presence or flow is required, the
ignition system must be disabled.
The filter is marked with a flow
direction arrow. Be sure that the
arrow points towards the fuel pump.
To decrease the risk of injury from
explosion or fire, never attempt to
repair a damaged or leaking fuel
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653045
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