Lesson Notes By Weeks and Term - Senior Secondary 3

Fuel pump and exhaust systems

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TERM – 2ND TERM

WEEK THREE

Class: Senior Secondary School 3

Age: 17 years

Duration: 40 minutes of 5 periods each

Date:

Subject: AUTO MECHANICAL

Topic: FUEL PUMP AND EXHAUST SYSTEMS

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

I.) Define fuel pump

II.) Identify the types of fuel pump

III.) Identify the functions of fuel pump

IV.) Discuss the principles of Operation of Fuel Pump

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher explains the meaning of fuel pump and describes the types of fuel pump

Students listens attentively to the teacher                                                                          

STEP 2

EXPLANATION

Teacher explains the functions and the principle of operation of fuel pump

Students exhibit attentiveness and active engagement

STEP 3

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

FUEL PUMP AND EXHAUST SYSTEMS

Fuel Pump

A fuel pump is a vital component of a vehicle's fuel system responsible for delivering fuel from the fuel tank to the engine. It ensures that the engine receives a steady and reliable supply of fuel for combustion.

A typical fuel injection pump

Types of Fuel Pump

  1. Mechanical Fuel Pump: Typically driven by the engine's camshaft or another mechanical linkage, this type of fuel pump uses a diaphragm or piston to create suction and draw fuel from the tank to the engine.
  2. Electric Fuel Pump: Found in most modern vehicles, an electric fuel pump is located inside the fuel tank and is powered by the vehicle's electrical system. It uses an electric motor to pressurize and deliver fuel to the engine.
  3. High-Pressure Fuel Pump: Some vehicles, especially those with direct fuel injection systems, require a high-pressure fuel pump to deliver fuel at the necessary pressure for efficient combustion.

Functions of Fuel Pump

  1. The primary function of a fuel pump is to deliver fuel from the fuel tank to the engine at a consistent rate and pressure.
  2. Fuel pumps help regulate fuel pressure within the fuel system to ensure proper engine operation and performance.
  3. During vehicle startup or after the vehicle has been sitting for an extended period, the fuel pump primes the fuel system by pressurizing it, making it easier for the engine to start.

Principles of Operation of Fuel Pump

  1. Suction or Compression: In mechanical fuel pumps, a diaphragm or piston moves back and forth, creating suction or compression to draw fuel from the tank and pressurize it for delivery to the engine.
  2. Electric Motor: Electric fuel pumps use an electric motor to drive a pump mechanism that pressurizes and delivers fuel to the engine. The motor is controlled by the vehicle's electronic control unit (ECU) to adjust fuel delivery based on engine demand.
  3. Internal Pressure Relief: Most fuel pumps are equipped with a built-in pressure relief valve or regulator to prevent fuel pressure from exceeding safe limits. This helps protect the fuel system components from damage.
  4. Fuel Return: In some fuel systems, excess fuel that is not used by the engine is returned to the fuel tank through a return line. The fuel pump may incorporate a return mechanism to manage this flow.

EVALUATION: 1. What is a fuel pump?

  1. Mention the types of fuel pump you know
  2. Identify 4 functions of fuel pump

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively