Question 1

When troubleshooting the root cause of a diesel injector in which the tip has been blown off, which of the following should be checked first?

Accepted Answer

A)  lubricity of diesel fuel 
B)  API gravity of fuel 
C)  methyl hydrate in fuel condition 
D)  water-in-fuel condition 
A)  lubricity of diesel fuel 
B)  API gravity of fuel 
C)  methyl hydrate in fuel condition 
D)  water-in-fuel condition

Question 2

What is the currently recommended method of filling a new secondary fuel filter following a filter service?

Accepted Answer

A)  charge air tanks with shop air 
B)  install an auxiliary electric pump into the fuel sub-system 
C)  hand or electric pump prime after installation 
D)  fill with fuel prior to installation onto the filter mounting pad 
A)  charge air tanks with shop air 
B)  install an auxiliary electric pump into the fuel sub-system 
C)  hand or electric pump prime after installation 
D)  fill with fuel prior to installation onto the filter mounting pad

Question 3

What would double gasketing of a primary fuel filter most likely cause?

Accepted Answer

A)  fuel leakage 
B)  no-start condition 
C)  sucking air into fuel 
D)  vapor lock 
A)  fuel leakage 
B)  no-start condition 
C)  sucking air into fuel 
D)  vapor lock

Question 4

What should be used to diagnose an air-in-fuel condition in a diesel fuel sub-system?

Accepted Answer

A)  on-board diagnostic software 
B)  mercury manometer 
C)  ether 
D)  diagnostic sight glass 
A)  on-board diagnostic software 
B)  mercury manometer 
C)  ether 
D)  diagnostic sight glass

Question 5

When water is present in the fuel tanks of a dual tank, single pickup fuel subsystem, where is it likely to settle?

Accepted Answer

A)  on top of the tank 
B)  emulsify in the fuel 
C)  in the pick-up tube 
D)  crossover pipe 
A)  on top of the tank 
B)  emulsify in the fuel 
C)  in the pick-up tube 
D)  crossover pipe

Question 6

You are checking for water in fuel using water detection paste on a probe and just the tip of the probe changes color. What should you do?

Accepted Answer

A)  nothing, this is normal 
B)  add a quart of methyl hydrate 
C)  drain the tank and refuel 
D)  contact the fuel supplier and ask for a refund 
A)  nothing, this is normal 
B)  add a quart of methyl hydrate 
C)  drain the tank and refuel 
D)  contact the fuel supplier and ask for a refund

Question 7

What is the correct method used to determine if water is present in a diesel fuel tank?

Accepted Answer

A)  drain tank and visually inspect 
B)  add a dye penetrant fluid 
C)  use water detection paste on a probe 
D)  drain sump and send for lab analysis 
A)  drain tank and visually inspect 
B)  add a dye penetrant fluid 
C)  use water detection paste on a probe 
D)  drain sump and send for lab analysis

Question 8

Where would you most likely find a WIF sensor? ?

Accepted Answer

A)  ?Fuel tank 
B)  ?Primary filter assembly 
C)  ?Secondary filter assembly 
D)  ?Common rail 
A)  ?Fuel tank 
B)  ?Primary filter assembly 
C)  ?Secondary filter assembly 
D)  ?Common rail

Question 9

When a fuel heater is used in a diesel fuel sub-system, what is the maximum temperature the fuel should be heated to?

Accepted Answer

A)  75 degrees Fahrenheit 
B)  90 degrees Fahrenheit 
C)  110 degrees Fahrenheit 
D)  125 degrees Fahrenheit 
A)  75 degrees Fahrenheit 
B)  90 degrees Fahrenheit 
C)  110 degrees Fahrenheit 
D)  125 degrees Fahrenheit

Exam 19: Fuel Subsystems

When troubleshooting the root cause of a diesel injector in which the tip has been blown off, which of the following should be checked first?

What is the currently recommended method of filling a new secondary fuel filter following a filter service?

What would double gasketing of a primary fuel filter most likely cause?

What should be used to diagnose an air-in-fuel condition in a diesel fuel sub-system?

When water is present in the fuel tanks of a dual tank, single pickup fuel subsystem, where is it likely to settle?

You are checking for water in fuel using water detection paste on a probe and just the tip of the probe changes color. What should you do?

What is the correct method used to determine if water is present in a diesel fuel tank?

Where would you most likely find a WIF sensor? ?

When a fuel heater is used in a diesel fuel sub-system, what is the maximum temperature the fuel should be heated to?

Introduction

Hand and Shop Tools, Precision Tools, and Units of Measurement

Personal and Safety Awareness

Engine Basics

History of the Heat Engine

Power

Engine Powertrain Components

Engine Feedback Assembly

Engine Housing Components

Engine Lubrication Systems

Engine Cooling Systems

Engine Breathing

Engine Retarders

Servicing and Maintenance

Engine Removal, Disassembly, Cleaning,

Diesel Engine Run- in and Performance Testing

Chemistry and Combustion

Diesel Fuel Characteristics

Fuel Injection Basics and Governor Principles

Injector Nozzles

Port-Helix Metering Injection Pumps

Inlet-Metering Rotary Distributor Pumps

Sleeve-Metering Rotary Distributor Pumps

Single-Actuator Eui Systems

Dual-Actuator Eui Systems

Heui Fuel Systems

Electronic Unit Pump Eup Systems

Cummins Hpi-Tp

Common Rail Systems

Amplified Common Rail Systems

Review of Electrical and Electronics Fundamentals

Vehicle Computer Systems

Ests and Siss

Electrical Wiring, Connector Terminal Repair

Multiplexing

The Connected Vehicle

Natural Gas, Propane, and Biodiesel Fuels

High Voltage Electricity

Hybrid and Hydrogen Fuel Cell Drivetrains

Electric Powertrains

Bosch Edc Systems

Caterpillar Engine Management Systems

Cummins Management Systems

Detroit Diesel Electronic Controls Ddec

Navistar Diamond Logic

Paccar Engine Management Systems

Volvo and Mack Engine Management

Emissions Management

Servicing Maintenance of Exhaust Aftertreatment Systems

Failure Analysis

Troubleshooting and Diagnostics

Filters