AUT 121 Final - Fuel Systems 1

A good fuel pump should supply how much fuel per minute?

0.5 to 1 gallon

Most fuel filters are designed to remove particles larger than ________.

10 to 20 microns

How much compressed natural gas (CNG) does it require to achieve the energy of one gallon of gasoline?

122 cubic feet

How many watts are consumed by a light bulb if 1.2 amperes are measured when 12 volts are applied?

14.4 watts

Ultra-low-sulfur diesel fuel has how much sulfur content?

15 PPM

How many watts are consumed by a starter motor if it draws 150 amperes at 10 volts?

1500 watts

If 200 amperes flow from the positive terminal of a battery and operate the starter motor, how many amperes will flow back to the negative terminal of the battery?

200 amperes

A normally aspirated automobile engine loses about ________ power per 1000 feet of altitude.

3%

If 12 volts are being applied to a resistance of 3 ohms, ________ amperes will flow.

4

The first fuel filter in the sock inside the fuel tank normally filters particles larger than ________.

70 to 100 microns

How many degrees of CRANKSHAFT rotation are needed to complete the four stroke combustion cycle?

720

One cylinder of an automotive four-stroke cycle engine completes a cycle every ________.

720°

B20 biodiesel has how much regular diesel fuel?

80%

E85 means that the fuel is made from ________.

85% ethanol, 15% gasoline

When testing a relay using an ohmmeter, which two terminals should be touched to measure the coil resistance?

86 and 85

Which relay terminal is the normally closed (NC) terminal?

87a

Technician A says that knowing if there are any stored diagnostic trouble codes (DTCs) may be helpful when checking for related technical service bulletins (TSBs). Technician B says that only a factory scan tool should be used to retrieve DTCs. Which technician is correct?

A Only

Technician A says that the crankshaft determines the stroke of an engine. Technician B says that the length of the connecting rod determines the stroke of an engine. Which technician is correct?

A Only

The specific gravity of diesel fuel is measured in what units?

API gravity

A meter used to measure amperes is called a(an) ________.

Ammeter

When measuring resistance, a reading of OL on the DMM indicates ________.

An open circuit

Technician A says that fuel pump modules are spring-loaded so that they can be compressed to fit into the opening. Technician B says that they are spring-loaded to allow for expansion and contraction of plastic fuel tanks. Who is right?

B Only

Technician A says that reprogramming a PCM using the J2534 system requires a factory scan tool, while Technician B says it requires Internet access. Which technician is correct?

B Only

Most manufacturers of vehicles equipped with diesel engines allow what type of biodiesel?

B5

In a schematic, a wire is labelled "BLK/WHT". This wire is ________.

Black with a white tracer

Technician A says that a good relay should measure between 60 and 100 ohms across the coil terminals. Technician B says that OL should be displayed on an ohmmeter when touching terminals 30 and 87. Which technician is correct?

Both A and B

Technician A says that if the opposite DTC can be set, the problem is the component itself. Technician B says that if the opposite DTC cannot be set, the problem is with the wiring or grounds. Which technician is correct?

Both A and B

Technician A says that in going to high altitudes, engines produce lower power. Technician B says that most engine control systems can compensate the air-fuel mixture for changes in altitude. Which technician is correct?

Both A and B

Technician A says that spark knock, ping, and detonation are different names for abnormal combustion. Technician B says that any abnormal combustion raises the temperature and pressure inside the combustion chamber and can cause severe engine damage. Which technician is correct?

Both A and B

Technician A says that the first step in the diagnostic process is to verify the problem (concern). Technician B says that the second step is to perform a thorough visual inspection. Which technician is correct?

Both A and B

Technician A says that the research octane number is higher than the motor octane number. Technician B says that the octane rating posted on fuel pumps is an average of the two ratings. Which technician is correct?

Both A and B

Technician A says that there is often more than one circuit being protected by each fuse. Technician B says that more than one circuit often shares a single ground connector. Which technician is correct?

Both A and B

Which component in this electrical circuit is considered the "load"? (A-Battery, B-Fuse, C-Lamp, D-Wire)

C-Lamp

When using a DMM, the black lead usually goes in which port?

COM

What rating of diesel fuel indicates how well a diesel engine will start?

Cetane rating

What is the symbol for voltage used in calculations?

E

What can be used to measure the alcohol content in gasoline?

Electronic tester or graduated cylinder

All of these are correct EXCEPT ________.

Engines produce higher horsepower at higher altitude.

Which part of the four stroke cycle is illustrated in this drawing? (Exhaust valve open)

Exhaust

(T/F) An open electrical circuit has zero ohms resistance

False

Most diesel fuel is what grade?

Grade #2

If it is tripped, which type of safety device keeps the electric fuel pump from operating?

Inertia switch

Where is the fuel pump located on most vehicles today?

Inside the fuel tank

Which of the following is the most correct statement about the direction of engine rotation?

Most engines rotate clockwise as viewed from the front of the engine.

Two technicians are discussing finding a short to ground using a test light. Technician A says that the test light, connected in place of the fuse, will light when the circuit that has the short is disconnected. Technician B says that the test light should be connected to the positive (+) and negative (-) terminals of a battery during this test. Which technician is correct?

Neither A nor B

How many rotations of the crankshaft are required to complete each stroke of a four-stroke cycle engine?

One-half

Torque is expressed in units of ________.

Pound-feet

High resistance in a circuit ________.

Reduces current flow through the circuit

Which method can be used to reprogram a PCM?

Remote Off-board Direct (Any of these)

The electrical path to ground may be completed by ________.

The vehicle frame The metal body of the vehicle The engine (All of the above)

Which item is NOT important to know before starting the diagnosis of an engine performance problem?

Type of gasoline used The temperature of the engine when the problem occurs (Brand of engine oil used) List of previous repairs

Which step should be performed LAST when diagnosing an engine performance problem?

Verifying the repair

Which of the following describes a drawing or chart of an electrical circuit using lines and symbols to represent circuit path and components?

Wiring Diagram & Schematic

Inductive pickups work because of what principle?

a magnetic field surrounds any wire carrying a current

On a wiring diagram, S110 with a ".8 BRN/BLK" means ________.

a splice of a brown with black stripe, wire size being 0.8 square millimeters (18 gauge AWG)

Vapor lock can occur ________.

as a result of excessive heat near fuel lines & if a fuel line is restricted

The amperage draw of an electric fuel pump is higher that specified. All of the following are possible causes EXCEPT ________.

clogged fuel filter (corroded electrical connections at the pump motor) defective fuel pump restriction in the fuel line

The chemical energy in fuel is converted to heat by the burning of the fuel at a controlled rate. This process is called ________.

combustion

The chemical energy in fuel is converted to heat by the burning of the fuel at a controlled rate. This process is called ________.

combustion

The ratio of the volume of a cylinder with the piston at BDC to the volume of the cylinder with the piston at TDC is known as ________.

compression ratio

This symbol in a wiring diagram indicates ________. (--->>---)

connector

Ethanol can be produced from what products?

corn, switchgrass, sugarcane

The amperage draw of an electric fuel pump is lower than specified. What is the most likely cause?

corroded electrical connections at the pump motor

The intake manifold does which of the following:

delivers air to the combustion chamber

A flex-fuel vehicle can be identified by ________.

emblems on the side, front, and/or rear of the vehicle, VECI, VIN

A generic (global)-type scan tool can retrieve ________ data.

emission related

E-diesel is diesel fuel with what additive?

ethanol

Horsepower is expressed in units of ________.

foot-pounds per minute

The gasoline burned inside the internal combustion engine is a type of ________.

hydrocarbon

Which method of blending ethanol with gasoline is the most accurate?

in-line

If the voltage increases in a circuit, what happens to the current (amperes) if the resistance stays the same?

increases

Avoid topping off the fuel tank because ________.

it can saturate the charcoal canister

Corrosion on electrical terminals may cause ________.

lights to be dimmer than normal

What personal protective equipment should be worn when working with alternative fuels?

long sleeve shirt and long pants, gloves, safety glasses

Which alcohol is dangerous (toxic)?

methanol

Methanol is also called ________.

methyl hydrate, methyl alcohol, wood alcohol

Biodiesel is ________.

mono-alkyl esters mixed with diesel fuel

What prevents the fuel pump inside the fuel tank from catching the gasoline on fire?

no air is around the motor brushes

Fuel lines are constructed from ________.

nylon plastic and seamless steel tubing

For an electrical device to operate, it must have ________.

power and a ground

Liquefied petroleum gas (LPG) is also called ________.

propane

Which is the most widely used alternative fuel?

propane

What color is diesel fuel dyed if it is for off-road use only?

red

Using ethanol-enhanced or reformulated gasoline can result in ________.

reduced fuel economy compared to using 100% gasoline

If an insulated wire rubbed through a part of the insulation and the wire conductor touched the steel body of a vehicle, the type of failure would be called a(n) ________.

short to ground

Which circuit failure is most likely to cause a fuse to blow?

short to ground

If two insulated wires were to melt together where the copper conductors touched each other, the type of failure would be called a(n) ________.

short to voltage

All switches illustrated in schematics are ________.

shown in their normal postion

High resistance in a circuit can cause ________.

slow motor operation dim lights clicking of relays or solenoids (Any of the above)

Measuring voltage drop is preferred to measuring resistance because:

the circuit is active

When refueling a CNG vehicle, why is it recommended that the tank be filled to a high pressure?

the range of the vehicle is increased

The coolant flow through the radiator is controlled by the ________.

thermostat

A short circuit can be located using a ________.

tone generator gauss gauge test light (All of the above)

A rotating force is called ________.

torque

An SOHC V8 engine has how many camshafts?

two

Where is connector C250 located?

under the dash

The preferred method to clear diagnostic trouble codes (DTCs) is to ________.

use a scan tool

Winter blend gasoline ________.

vaporizes more easily than summer-blend gasoline has a higher RVP can cause engine driveability problems if used during warm weather (All of the above)

What clogs fuel filters when the temperature is low on a vehicle that uses diesel fuel?

wax

What is the factory scan tool for Chrysler brand vehicles equipped with CAN?

wiTECH