TOHATSU 40 Service Manual page 69

FUEL SYSTEM
1. Clean all metal components using a mild aerosol solvent or
isopropyl alcohol. Use a soft bristle brush to remove gummy
deposits. Clean plastic parts with warm soapy water.
2. Dry all components with low pressure compressed air. When
drying passages, direct the flow of air opposite the direction of fuel
flow.
3. Inspect the carburetors, this section.
Inspection
All worn, damaged, or missing parts must be replaced.
1 2 3
Internal Components
1. Inspect the following float valve components:
• Check tip of float valve (1) for grooves, nicks, or distortion.
• Check float valve pin (2) and float clip (3) for damage or
deformation.
• Check float (4) for damage and signs of fuel saturation.
2. Inspect pilot adjust screw (5) for thread damage. Check tip for
grooves, nicks, or distortion.
3. Check tension of throttle stop screw and pilot adjust screw
springs. DO NOT interchange the springs.
T1029
4. Inspect main jet (6) for thread damage and blockage. Check all
passages in main nozzle (7) are free of blockage.
5. Inspect slow jet (8) for thread damage and blockage.
Carburetor Body
6. Check all passages and drillings with a syringe filled with
isopropyl alcohol.
T1030
T1031
3-21
3-/ 4-Cylinder