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Fuel System And Carburetor
27
The function of the fuel system is to store fuel, mix the fuel with air and deliver it to the combustion chamber. The
fuel system consists of the following components:
• Fuel tank
• Fuel lines
• Fuel filter
• Carburetor
NOTE: When working on the fuel systems, look at the whole system. A problem will rarely be isolated to one
component.
To troubleshooting the fuel system:
1. Drain and inspect the fuel by following the steps
described in the next section of this chapter.
2. Inspect the fuel filter. If it is dirty, replace it following
the steps described in Chapter 2: Maintenance.
See Figure 5.1.
3. Inspect the fuel lines:
3a. Are they cracked?
3b. Are they clogged?
3c. Are they brittle?
NOTE: If the answer to any of the above is yes, replace
the fuel lines following the procedure described in
the fuel line section of this chapter.
4. The fuel cap is vented. Ensure that the vent is clean
and working properly. See Figure 5.2.
5. Test and inspect the primer bulb:
5a. Is it leaking or is it brittle?
5b. If so, replace the primer bulb.
5c. Does it circulate fuel when pumped?
5d. If not, replace the primer.
6. If compression, ignition and fuel supply are OK, but
the engine does not run with fresh fuel, repair or
replace the carburetor as described in the Carburetor
Repair section of this chapter.
7. Test run the engine before returning it to service.
Figure 5.1
Fuel filter
Figure 5.2
Vent
CHAPTER 5: FUEL SYSTEM AND CARBURETOR