240 version 8
15-Feb-16
1 of 4
AUTOMOTIVE FUEL SYSTEMS AND
EXHAUST
Demonstrate knowledge of petrol fuel
systems
level:
2
credit:
3
planned review date:
December 2009
sub-field:
Motor Industry
purpose:
This theory-based unit standard is for people who wish to
enter or are employed in the automotive repair industry.
People credited with this unit standard are able to
demonstrate knowledge of petrol as an automotive fuel,
petrol combustion processes, and an electronic fuel injection
(EFI) system.
entry information:
Open.
accreditation option:
Evaluation of documentation by NZQA and industry.
moderation option:
A centrally established and directed national moderation
system has been set up by the NZ Motor Industry Training
Organisation.
special notes:
Information on automotive petrol fuel systems can be found
from:
training provider, industry and/or manufacturer’s courses;
vehicle workshop manuals; automotive mechanical and fuel
system textbooks (contact your local book retailer, school or
polytechnic library or the public library lending service);
useful websites include but are not limited to:
–
Automotive Books Ltd http://www.autobooks.co.nz;
–
Capital Books http://www.capitalbooks.co.nz;
–
How Stuff Works http://www.howstuffworks.com;
–
New Zealand Book Find http://www.nzbookfind.com;
–
public libraries http://www.libraries.co.nz;
–
Technical Books http://www.techbooks.co.nz;
–
Whitcoulls http://www.whitcoulls.co.nz.
 New Zealand Qualifications Authority 2016
240 version 8
15-Feb-16
2 of 4
AUTOMOTIVE FUEL SYSTEMS AND
EXHAUST
Demonstrate knowledge of petrol fuel
systems
Elements and Performance Criteria
element 1
Demonstrate knowledge of petrol as an automotive fuel.
performance criteria
1.1
The main differences between types and grades of petrol that are commercially
available are described according to the oil company specifications.
1.2
The means of identifying types and grades of petrol are described according to
the oil company specifications.
Range:
1.3
octane rating, colour, commercial names.
The use of fuel additives is described according to the product manufacturer’s
descriptions.
Range:
upper cylinder lubricant, electronic fuel injection (EFI) injector
cleaner.
element 2
Demonstrate knowledge of petrol combustion processes.
performance criteria
2.1
Air-fuel mixture ratios and their effect on engine power, fuel economy, and
efficiency are described according to textbook descriptions.
Range:
2.2
stoichiometric fuel mixture, lean air-fuel mixture, rich air-fuel
mixture.
Normal combustion processes within the engine’s combustion chamber are
described according to textbook descriptions.
 New Zealand Qualifications Authority 2016
240 version 8
15-Feb-16
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AUTOMOTIVE FUEL SYSTEMS AND
EXHAUST
Demonstrate knowledge of petrol fuel
systems
2.3
Effects of abnormal combustion on engine performance are described
according to textbook descriptions.
Range:
detonation, pre-ignition, dieseling, spark knock.
element 3
Demonstrate knowledge of an electronic fuel injection (EFI) system.
performance criteria
3.1
Components of an EFI system are identified and their locations on a vehicle are
described according to the vehicle manufacturer’s workshop manual
descriptions.
Range:
3.2
Functions of the parts of a fuel tank are described according to the vehicle
manufacturer’s workshop manual descriptions.
Range:
3.3
expansion volume, anti-blowback, filler cap, pressure/vacuum
valve, filters, pick-up tube.
Operating principles of an EFI system are described according to the
manufacturer’s manual descriptions.
Range:
3.4
injectors, fuel rail, pressure regulator, air flow and air pressure
sensors, throttle position sensor, engine temperature sensor,
electronic control unit, fuel pump.
fuel supply, fuel metering and delivery, mixture adaptation.
Safety precautions necessary when working on a vehicle with EFI are described
according to the vehicle manufacturer’s workshop manual descriptions.
Range:
care when working with and handling pressurised fuel lines,
prevention of petrol-rich fumes entering the catalytic converter.
 New Zealand Qualifications Authority 2016
240 version 8
15-Feb-16
4 of 4
AUTOMOTIVE FUEL SYSTEMS AND
EXHAUST
Demonstrate knowledge of petrol fuel
systems
Comments on this unit standard
Please contact the NZ Motor Industry Training Organisation jlane@mito.org.nz if you wish
to suggest changes to the content of this unit standard.
Please Note
Providers must be accredited by the Qualifications Authority or a delegated interinstitutional body before they can register credits from assessment against unit standards
or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by the Qualifications Authority before
they can register credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for providers wishing to
develop education and training programmes, such as minimum qualifications for tutors and
assessors, and special resource requirements.
This unit standard is covered by AMAP 0014 which can be accessed at
http://www.nzqa.govt.nz/site/framework/search.html.
 New Zealand Qualifications Authority 2016