AET 261 unit 1

(Ch. 19) A good fuel pump should be able to supply how much fuel per minute?

0.5 to 0.8 gallon

What can occur if fuel pump is not working

1 engine hard to start or might not start at all 2 rough idle and stalling 3. Possibly can have erratic shifting of the automatic transmission as a result of engine missing due to lack of fuel pump pressure and or volume

(ch.19) what can occur if fuel filter is clogged

1 lower pawer at higher speeds. will not go faster then a certain speed like it is being limited. 2.engine will cut out or miss acceleration, especially when climbing up hills.

(ch.19) How much PSI does the fuel delivery system supply? What about Throttle body injection units what about multiport fuel injection

10-15 PSI Throttle body injection- 35 PSI multiport fuel injection- 60 PSI

(Ch. 19) Most fuel filters are designed to remove particles larger than ___

20 microns

A naturally aspirated engine loses about ________ power per 1,000 ft of altitude. Ch3 page 59

3%

Most port fuel-injected engines operate on how much fuel pressure? (23)

35 to 45 PSI

how much oil can the oil pan hold Ch. 3 pg 48

4-7 quarts

(Ch. 19) How many gallons of gas does the fuel pump bring to the injectors per hour and at what psi.

40-50 gollons at 70-90 Psi

The ignition system transfers 12 volts from the battery and converts it to ________ to _________ volts needed to jump the gap of a spark plug.

5,000- 40,000

(ch.30) The fuel pump inside the fuel tank on a vehicle equipped with GDI produces about what fuel pressure?

50 to 60 PSI

(ch.30) The fuel injectors used on a GDI system are pulsed on using what voltage?

50 to 90 V

(ch.30) The fuel injectors operate under a fuel pressure of about ___

500 to 2,900 PSI

(Ch. 19) The first fuel filter in the sock inside the fuel tank normally filters particles larger than ____

70 to 100 microns

E85 means that the fuel is made from _______. (pop quiz)

85% ethanol, 15% gasoline

What is vapor lock?

A lean condition caused by vaporized fuel in the fuel system, taking up space that would normally be occupied by liquid fuel causing improper operation of the fuel injection system.

List two benefits of blending ethanol into gasoline (E10).

Adding ethanol to petrol in lower percentages, such as 10 percent ethanol and 90 percent petrol (E10), reduces carbon monoxide emissions from the petrol and improves fuel octane.

Fuel injectors can be tested using ___ (23)

An Ohmmeter, A stethoscope, A scope

(ch.30) The high-pressure fuel pump pressure is regulated by using ____

An electronic pressure-control valve

(Ch. 19) A fuel pump was measured for current draw and amperage exceeded factory specifications. This can be caused by a ___ Clogged fuel filter Restricted fuel line Defective fuel pump Any of the above

Any of the above

vapor lock can occur when: (pop quiz)

As a result of excessive heat near fuel lines If a fuel line is restricted

(ch.20)Where is the fuel-pressure regulator located on a vacuum-biased port fuel-injection system?

At the outlet of the fuel rail

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. Who is right? (pop quiz)

Both Technician A and B

The fuel pressure drops rapidly when the engine is turned off. Technician A says that one or more injectors could be leaking. Technician B says that a defective check valve in the fuel pump could be to cause. Which technician is correct? (ch 23)

Both Technician A and B

(Ch. 19) A fuel pump is being replaced for the third time. Technician A says that the gasoline could be contaminated. Technician B says that the wiring to the pump could be corroded. Which technician is correct?

Both Technicians A and B

(ch.20) Technician A says that the fuel pump relay is usually controlled by the PCM. Technician B says that a TBI injector squirts fuel above the throttle plate. Which technician is correct?

Both Technicians A and B

Fuel-injection service is being discussed. Technician A says that the throttle plate(s) should be cleaned. Technician B says that the fuel rail should be cleaned. Which technician is correct? (23)

Both Technicians 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. Who is right? (pop quiz)

Both technicians are right

Technician A says that spark knock, ping, and detonation and 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 damage. Who is right? (pop quiz)

Both techs are right

what is the compression ratio formula Ch. 3 Page 57

CR= volume in cylinder with piston at bottom of cylinder/ volume in cylinder with piston at top center

(Ch. 19) The amperage draw of an electric fuel pump is higher than specified. All of the following are possible causes except ___. A. Corroded electrical connections at the pump motor B. Clogged fuel filter C. Restriction in the fuel line D. Defective Fuel Pump

Corroded electrical connections at the pump motor

(ch.30) A lack of power from an engine equipped with GDI could be due to ___ A.Noisy injectors B.Carbon on the injectors C.Carbon on intake valves D.Both b and c

D

Winter-blend gasoline _________. (pop quiz) A.Vaporizes more easily than summer-blend gasoline B.Has higher RVP C.Can cause engine driveability problems if used during warm weather D.All of the above

D all of the above

(ch.30) Where is the fuel injected in an engine equipped with GDI?

Directly into the combustion chamber

What component pulses the fuel injector on most vehicles? (23)

Electronic control unit (ECU)

(ch.20) Which type of port-injection system uses a fuel temperature and/or fuel-pressure sensor?

Electronic returnless systems

What is a FFV, and how is it identified?

Flexible fuel vehicle. Yellow fuel cap, emblems on the side, front and/or rear, vehicle emission control information under the hood, and the VIN.

List three things that should be checked as part of a thorough visual inspection. (ch.30)

Fluid Levels) (New parts or Recent repairs) (Leaks)

(ch19.) what does the fuel delivery system include

Fuel tank fuel pump fuel filter fuel lines

The diesel injection pump is usually driven by a ___. (4)

Gear off the camshaft

What part should be removed to test cylinder compression on a diesel engine? (4)

Glow plug or injector

What can be used to measure the alcohol content in gasoline? (pop quiz)

Graduated cylinder Electronic tester Scan tool

How is diesel fuel ignited in a warm diesel engine? (4)

Heat of compression

Which diesel system supplies high-pressure diesel fuel to all of the injectors all of the time? (ch.4)

High-pressure common rail

What does the term "Stoichiometric" mean, and what is the value for gasoline-air mixtures?

IT means chemically perfect and ratio is 14.7:1 for gasoline

The three phases of diesel ignition include ___. (4)

Ignition delay, rapid combustion, controlled combustion

Which method of blending ethanol with gasoline is the most accurate? (pop quiz)

In-line

Which diesel injection system requires the use of a glow plug? (4)

Indirect injection (IDI)

Which type of diesel injection produces less noise? (4)

Indirect injection (IDI)

(Ch. 19) If it is tripped, which type of safety device will keep the electric fuel pump from operating?

Inertia switch ( there are other protective measure to like having one way check valves)

Avoid topping off the fuel tank because __________________. (pop quiz)

It can saturate the charcoal canister.

What does the (R + M) ÷ 2 gasoline pump octane rating indicate? (

It indicates the antiknock index. The research octane number plus the motor octane number divided by 2 gives you an average between the two.

Describe how elevation changes the volatility and octane requirement for gasoline.

Lower air pressure (lower density) creates lower peak pressure and temperatures in engine (reduced risk of knock). Octane number lowered: ~1 point per 1000 ft. Lower atmospheric pressure lowers boiling point of fuel (increases volatility). High elevation fuel should be less volatile.

Which fuel below has the highest energy content per gallon? (pop quiz)

Methonal

Technician A says that glow plugs are used to help start a diesel engine and are shut off as soon as the engine starts. Technician B says that the glow plug s are turned off as a flame is detected in the combustion chamber. Which technician is correct? (4)

Neither Technicians A nor B

The vacuum hose from the fuel-pressure regulator was removed from the regulator and gasoline dripped out of the hose. Technician A says that is normal and that everything is okay. Technician B says that one or more of the injectors may be defective, causing the fuel to get into the hose. Which technician is correct? (ch 23)

Neither technicians A nor B

(Ch. 19) What prevents the fuel pump inside the tank from catching the gasoline on fire?

No air is around the motor brushes

Throttle-body fuel-injection systems use what type of injector driver? (23)

Peak and hold

What are the two types of abnormal combustion and how are they different?

Pre-ignition and detonation. During detonation, the fuel air mixture ignites when it is supposed to, but the flame front travels much too fast and all of the combustion power is released before the piston can use it to travel back down. During pre-ignition, the air fuel mixture is ignited earlier than it is supposed to while the piston is traveling up.

(ch.20) Dampeners are used on some fuel rails to ____

Reduce noise

(ch.20) Why are some fuel rails rectangular in shape?

Reduces noise

(ch.19) Which fuel system has more pressure return or returnless and why.

Returnless because it helps reduce the formation of fuel vapors in the system.

Port fuel-injection systems generally use what type of injector driver? (23)

Saturated switch

(Ch. 19) Fuel lines are constructed from ____

Seamless steel tubing and Nylon plastic

(ch.20) Which Duel-injection system uses the MAP sensor as the primary sensor to determine the base pulse width? A) speed density B) mass air flow C) demand delivery D) mechanical returnless

Speed density

If the throttle plate needs to be cleaned, what symptoms will be present regarding the operation of the engine? (23)

Stalls, Rough Idle, Hesitation on Acceleration

(ch.20) What type of device is used in a typical idle air control?

Stepper motor

(ch.30) Which mode of operation results in a richer air-fuel mixture near the spark plug?

Stratified

(ch.20) Which sensor has the greatest influence on injector pulse width besides the MAF sensor?

TP

(ch.30) A GDI system can be used to start an engine without the need for a starter True False

TRUE

(ch.30) Some engines that use a GDI system also have port injection True False

TRUE

(Ch. 19) Technician A says that the 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. Which technician is correct?

Technician B only

(ch.20) Technician A says that the port fuel injection injectors operate using five volts from the computer. Technician B says that sequential fuel injectors all use a different wire color on the injectors. Which technician is correct?

Technician B only

(ch.30) The high-pressure fuel pumps used in GDI systems are powered by ____

The camshaft

Describe the cetane rating of a fuel.

The cetane number is the opposite of the octane number for gasoline. It measures the ease with which the fuel can be ignited.

In a typical port fuel-injection system, which injectors are most subject to becoming restricted? (ch23)

The injectors at the end of the rail on a returnless system or The injectors at the bends in the rail

Describe the cloud point of diesel fuel.

The low temperature point when waxes present in most diesel fuels tend to form crystals that can clog fuel filters.

(ch.20) Why is a vacuum line attached to a fuel-pressure regulator on many port-fuel-injected engines?

To create an equal pressure drop across the injectors

(ch.19) why would engineers want to put the fuel regulator in the back near the tank.

To prevent heat being sent back to the tank which would result in an increase of vaporization. With the regulator in the back the system in returnless.

Using ethanol-enhanced or reformulated gasoline can result in reduced fuel economy. True or False (pop quiz)

True

What is the specific gravity of diesel fuel and how is it measured?

Typically around 40 API gravity. It is measured using a hydrometer calibrated in API gravity units.

List the 8-step funnel diagnostic procedure. (ch.30)

Verify the problem (concern) Perform a thorough visual inspection and basic tests. Retrieve the diagnostic trouble codes (DTCs) Check for technical service bulletins (TSBs) Look carefully at scan tool data. Narrow the problem to a system or cylinder. Repair the problem and determine the root cause. verify repair

What fuel system component is used in a vehicle equipped with a diesel engine that is seldom used on the same vehicle when it is equipped with a gasoline engine? (4)

Water-fuel separator

What is Reid vapor pressure?

a common measure of and generic term for gasoline volatility. It is pressure of vapor at 100 degrees F.

(ch19) what is a positive displacement pump. give examples.

a design that forces everything that enters the pump to leave the pump. rotary vane pump gerotor terbine pump(most popular)

(ch.19) how much fuel is recirculated

about 80 percent of the pumps volume is sent back to the tank

what is a flat head engine CH.3 ph 47

an engine where the valves are located in the engine block instead of the cylinder head

What is an engine block normally made from CH. 3 pg 46

cast iron or aluminum

how to check if coolent is in the oil. Ch. 30 pg 381

drip some oil from the dip stick on to the hot exhaust manifold. if it bubbles then it means that coolant is in the oil.

List two advantages of using ethanol fuels.

helps prevent global warming, cost effective

(ch.19) do returnless fuel systems have replaceable filters

no cause they are built into the fuel pump modual assembly

(ch.19) fuel pumps can be tested by checking the following

pressure volume specified current draw

What color is diesel fuel dyed if it is for off-road use only? (pop quiz)

red

what allows the voltage to get to that 5,000- 40,000 mark pg ch. 3 48

the ignition coils.

(ch. 19) what is the purpose of a accumulator and a pulsator.

to reduce pressure pulses and noise

What are the two most important properties of gasoline?

volatility Knock resistance)

Glow plugs should have high resistance when ___ and lower resistance when _

warm/cold

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

wax the wax formed in deasil fuels tends to crystalize. this can clog filters when tempature is to low. This temp is called cloud point.

What is the difference between summer-blend and winter-blend gasoline?

winter blend gasoline is formulated to vaporize at lower temperatures for proper starting and drivability at lower temperatures. winter blend gasoline allows volatility of up to 15 pounds per square inch. Summer blend gasoline vaporizes easier in warmer temperatures. The volitlity of summer gas is 7 psi RVP.