4.4 Petrol fuel Systems

• illustrate the layout of a petrol fuel system
• describe the function of components of a petrol fuel system
• service the fuel system of a petrol engine
• appreciate the importance of the petrol fuel system

“How does a mechanical petrol fuel system work?”

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1. From tank to cylinder
   40 min · 1 practice tasks · quiz
   Name the parts of a mechanical petrol fuel system and what each does.
2. The tank, cap and breather
   40 min · 1 practice tasks · quiz
   Describe the tank, its cap, breather, pickup and drain, and the fire safety around petrol.
3. The mechanical pump
   40 min · 1 practice tasks · quiz
   Name the parts of a mechanical fuel pump and say how it moves petrol.
4. Lines, hoses and clips
   40 min · 1 practice tasks · quiz
   Describe how the lines are routed and how a joint is made and checked.
5. Clean fuel: the filter
   40 min · 1 practice tasks · quiz
   Service the fuel filter and strainer and read the signs of a blocked filter.
6. Clean air: the air cleaner
   40 min · 1 practice tasks · quiz
   Service a paper or oil-bath air cleaner and explain why the engine needs clean air.
7. The carburettor at work
   40 min · 1 practice tasks · quiz
   Name the main carburettor parts and describe how the venturi draws fuel into the air.
8. Setting the float height
   40 min · 1 practice tasks · quiz
   Check and adjust the float height against the card without bending the needle.
9. Looking for leaks
   40 min · 1 practice tasks · quiz
   Inspect the fuel system for leaks safely and refuse tape and a flame test.
10. The service order, and why it matters
    40 min · 1 practice tasks · quiz
    Follow the service order, dispose of the waste properly, and say why the fuel system matters.