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
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PRESENTATION
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TEACHER’S ACTIVITY
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STUDENT’S
ACTIVITY
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STEP 1
INTRODUCTION
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The teacher explains the meaning of fuel pump and describes the types of fuel pump
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Students listens attentively to the teacher
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STEP 2
EXPLANATION
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Teacher explains the functions and the principle of operation of fuel pump
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Students exhibit attentiveness and active engagement
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STEP 3
NOTE TAKING
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The teacher writes a summarized
note on the board
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The students
copy the note in
their books
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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
- 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.
- 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.
- 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
- The primary function of a fuel pump is to deliver fuel from the fuel tank to the engine at a consistent rate and pressure.
- Fuel pumps help regulate fuel pressure within the fuel system to ensure proper engine operation and performance.
- 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
- 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.
- 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.
- 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.
- 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?
- Mention the types of fuel pump you know
- Identify 4 functions of fuel pump
CLASSWORK: As in evaluation
CONCLUSION: The teacher commends the students positively
