Fuel System And Carburetor
25
The function of the fuel system is to store fuel/oil mixture, mix the fuel/oil 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.
Fuel system troubleshooting
When troubleshooting the fuel system, all of these steps should be followed:
NOTE: A compression test must be preformed before troubleshooting the fuel system. The fuel system will not
work properly with a compression reading less than 90 psi (6.2 bar).
1. Drain the fuel.
2. Inspect the fuel.
3. Check the fuel/oil mixture.
4. Test for alcohol.
5. Inspect the fuel filter.
6. Inspect the fuel lines.
7. Check the fuel tank vent.
8. Inspect the primer.
Inspecting the fuel
NOTE: Fuel is the maintenance item most often overlooked by consumers. A lot of fuel system problems are
caused by bad gasoline. When inspecting the fuel:
•Look for water.
• Look for dirt.
• Look for discoloration.
• Sniff carefully to see if it smells like varnish or kerosene.
• Save the fuel to show to customer.
NOTE: Save a sample of the fuel collected to show the customer.
! WARNING! WARNING
Gasoline is extremely flammable and the vapors are explosive. Avoid all sources of heat when
working on the fuel system.
CHAPTER 5: FUEL SYSTEM AND CARBURETOR
For Parts Call 606-678-9623 or 606-561-4983
www.mymowerparts.com
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