Part of Unit: Engine Performance*
Lesson Plan Overview / Details
Students will understand the function of the fuel delivery system, types of fuel pumps and tanks, and identify major components.
- one block
- 90 Minutes
California Career and Technical Education Standards
- T.C.C1.2 Practice the safe handling and storage of chemicals and hazardous wastes in acco...
- T.C.C6.4 Maintain, diagnose, service and repair ignition, electronic and computerized eng...
California Academic Content Standards (Reinforced)
Objectives and Goals
- Students will be able to describe each of the major components and the purpose of the fuel delivery system
- Students will perform a fuel pressure test
Activities in this Lesson
- what's burning - Hooks / Set
Show students under a controlled environment a gasoline fire (ex. in a large metal container and pour a small amount of fuel and set it on fire). Do this outside, not indoors!!!!! Students will use safety glasses at all times.
Ask them what they see and have them discuss with each other.
- fuel system major components - Demo / Modeling
While lecturing students will follow on text book ( Thomson Delmar Learning, "Automotive Technology: A Systems Approach," 4th edition ), pages 691-712
I will start by explaining the layout and flow of the fuel system, refer to fig. 27-1. The flow starts from the Fuel Tank were the fuel is stored, explain fuel tank construction (ex. fuel tanks are made of pressed corrosion resistant steel, aluminum or molded polyethylene plastic. aluminum and plastic are the most common. they are made in a way that alows them to expand and contract with the changes of internal temperatur and pressure) then it's sucked or pushed by a fuel pump and this could be electric or mechanical fuel pump, electric pumps are the most common. At this point explain the components that pickup the fuel from the tank and how the fuel sending unit work, (ex. the strainer, fuel pump, sending unit) refer to fig. 27-6 and fig. 27-30.
Once the fuel travels out of the tank at a high pressure, the fuel flows through a steel or a flexible nylon lines to a fuel filter, many of the fuel filter are found under vehicle and some are at or near the engine. At this time take the time to explain fuel filter construction, (ex. Fuel filters are made of pleated paper element mounted inside of eather a metal or plastic case) refer to fig. 27-19.
Fuel travels out of the fuel filter through more fuel lines all the way to the engine, where it enters a fuel pressure regulator and any excess fuel is returned to the fuel tank through a fuel return line. I will explain the fuel regulator functions (eg. pressure regulators are controlled by engine vacuum). Refer to fig. 27-1. Once the fuel goes through the pressure regulator, it goes into a fuel rail where the fuel injectors are connected. Then the fuel enters the fuel the injectors and ultimetly in to the cylinders when opend by the PCM/ECM (computer).
- checking fuel pressure - Lab / Shop
Next I will explain the step by step process of checking fuel pressure on a port fuel injection engine. Refer to pages, 705 and 706 fig. p24-1 to p24-8 and fig. 27-26 and 27-27 on ( Thomson Delmar Learning, "Automotive Technology: A Systems Approach," 4th edition ).
Student need to look up fuel pressure specs for the vehicle that is been worked on, use Mitchell on demand or Alldata, If not available use repair manual.
- Clean up - Closure
Have all students pick up and sweep up if needed, wipe down vehicles worked on, put away any tools used and put away books, finally put chairs up on table.
- Assessment Types:
- Writing Samples, Teacher-Made Test,
Thomson Delmar Learning, "Automotive Technology: A Systems Approach," 4th edition.
1. In a fuel fire, what is actually burning?
2. Where is the largest amount of fuel stored in a vihecle?
3. By what means do we move the fuel from the fuel tank to the engine?
4. Fuel tanks are constructed out of three materials: _______________, _________________ and ___________________.
5. What does the fuel sending unit do?
6. In today's vehicles, what is the most commen fuel pump and where is it most comenly located?
7. Once the fuel reaches the engine at high pressure, it enters thrugh a _______ __________ ____________ and then to the ________ ___________.
8. What happens to the excesse fuel not used by the engine?
9. What opens the fuel injectors?
- Text Book ( Thomson Delmar Learning, "Automotive Technology: A Systems Approach," 4th edition )
- All major fuel system components, like: fuel pump and sending unit assembly, fuel lines, fuel filter, fuel rail and injectors
- Fuel pressur gauge
- Mitchell on demand or Alldata