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2-10 FUEL SYSTEM
Fuel Pump and Filter
.Turn the throttle cable lever to check that the throttle
butterfly valves move smoothly and return by spring
tension.
* If the throttle valves do not move smoothly. Replace the
carburetors.
.Check that the O-rings on the float bowl and pilot
screws and the diaphragm on the vacuum piston are in
good condition.
* If any of the O-rings or diaphragms are not in good
condition, replace them.
.Check the plastic tip of the float valve needle. It should
be smooth without any grooves, scratches, or tears.
Removal
.Remove the following.
Right Side Cover (see Frame chapter)
Fuel Hoses
.Disconnect the pump lead connector.
.Remove the fuel pump and filter.
1. Plastic Tip
2. Valve Needle
3. Rod
4. Valve Needle Wear
Installation
.Connect the fuel hoses.
O Install the fuel filter so that the arrow on it shows the
fuel flow from the fuel tank to the fuel pump.
O Be sure to route the hoses so that they will not be
kinked or stretched.
*If the plastic tip is damaged, replace the needle.
.Check the tapered portion of the pilot screw for wear
or damage.
Fuel Pump Inspection
Refer to the Electrical System chapter.
1. Pilot Screw
2. Tapered Portion
Fuel Filter Inspection
.Visually inspect the fuel filter according to the Periodic
Maintenance Chart (see General Information chapter).
*If the filter is clear with no signs of dirt or other
contamination, it is OK and need not be replaced.
*If the filter is dark or looks dirty, replace it. Also, check
the rest of the fuel system for contamination.
*If the pilot screw is worn or damaged on the tapered
portion, it will prevent the engine from idling smoothly.
Replace it.
A. Arrow Mark
B. Blow