Construction Mechanic Advanced: Fuel Overhaul

When fuel pressure decreases because of reduction in the engine speed, fuel from the position area drains through the orifice below what to allow the cam ring to retard? Ball check valve Ball relief valve Retard cam Cam ring valve

Ball check valve

What are some of the causes for low pressure in the transfer pump? Restricted fuel supply or air leaks on the suction side of the pump Worn transfer pump blades or a malfunctioning regulator valve Both 1 and 2

Both 1 and 2

Where on the engine is the lubricating oil heater generally installed? Drain plug Dipstick opening Oil line Both 1 and 2

Both 1 and 2

How is the fuel pump actuated on the Pulsa-Jet fuel carburetor? Changes in pressures in the air horn or throat Pulses of air in the fuel nozzle Changes in pressures in the fuel tank Steady pressures in the air horn or throat

Changes in pressures in the air horn or throat

What type of heater is mounted outside the engine and has the advantage of working in a short period of time? Immersion heater Intake air heater Circulating coolant heater Lube oil heater

Circulating coolant heater

In the Delphi EUI, what component is a solenoid consisting of a coil and armature with an integral poppet control valve? Control cartridge Control cylinder Plunger Pump element

Control cartridge

After the engine starts under cold conditions using a glow plug, how does the glow plug turn off? Operator must turn glow plug switch to OFF Putting transmission into drive Control circuit disconnects glow plug None of the above

Control circuit disconnects glow plug

What happens when the solenoid on the EUI is energized and its armature is pulled upward, closing the poppet valve and descending the plunger? Creates a rapid rise in pressure within the fuel supply chamber Causes a decrease in pressure within the fuel supply The spray tip assembly receives air to mix with the fuel Creates a rise in air pressure

Creates a rapid rise in pressure within the fuel supply chamber

What is the component that sends compressed fresh air to the intake manifold? Air inlet Intake tube Exhaust pipe Crossover tube

Crossover tube

Which manufacturer developed the pressure-timed fuel injection system? Cummins Caterpillar Detroit Diesel International Harvester

Cummins

What keeps the lines full of fuel so that a full charge of fuel can be injected at the next cycle for a cylinder after the discharging cycle? Rotor Delivery port Distributor valve Delivery valve

Delivery valve

Which carburetor has the ability to be used regardless of the position of the fuel tank? Flo-Jet Diaphragm without pump Diaphragm with pump Pulsa-Jet

Diaphragm with pump

The governor may be equipped with a/an _____ housed within the governor control cover. Electrical rotor Mechanical shut-off device Hydraulic shut-off device Electrical shut-off device

Electrical shut-off device

Of all the fuel injection systems, what was most readily adaptable of all the fuel injection systems to electronic control? Electronic element injectors Electronic unit injectors Electrical fuel insertion Electronic component module

Electronic unit injectors

Scavenging takes place during which strokes in a two-cycle engine? End of downstroke; beginning of upstroke End of upstroke; beginning of downstroke Beginning of intake downstroke; dead center exhaust stroke Dead center downstroke; end intake stroke

End of downstroke; beginning of upstroke

During which stroke(s) is the metering orifice uncovered and fuel flows into the injector cup? Intake stroke only End of intake stroke and beginning of the compression stroke Compression stoke only End of compression stroke and beginning of intake stroke

End of intake stroke and beginning of the compression stroke

Pressure leakage past the piston rings on the blower stroke is referred to as what? Engine blockage Piston blowby Engine blowby Engine pressure

Engine blowby

Lack of engine power, blue smoke, and increased engine power are some of the symptoms of turbocharger problems. True False

False

On a Vacu-Jet carburetor, multiple fuel pickup tubes are one of the design features. True False

False

On the throttle body injection system, the fuel injector is a cam- operated fuel valve. True False

False

The automatic choke on the Vacu-Jet and Pulsa Jet carburetors is opened by atmospheric pressure in front of the venturi. True False

False

The oxygen sensor functions immediately when the vehicle is started. True False

False

To prevent goring of the PT fuel pump and pump parts in reassembly, the mechanic should use which of the following means? Spring steel lock washers Flat steel washers Torque wrench Extreme pressure lubricant

Flat steel washers

What is one of the causes for carburetor leak on a Flo-Jet carburetor that is typically caused by transport? Float-bind Float-freeze Float-jump Float-bounce

Float-bounce

During your automatic choke inspection and after going through all the procedures, what may be the cause for the engine to run at idle when you adjust the mixture so lean that the engine should stop and the needle valve is closed? Air leak at the diaphragm Fuel leak in the venturi Fuel leak at the diaphragm Pump spring stuck

Fuel leak at the diaphragm

Which sensor sends an electronic signal proportional to the pressure inside the rail to the ECU? Fuel pressure sensor Fuel temperature sensor Fuel injection sensor Intake air temperature sensor

Fuel pressure sensor

On the enhanced evaporative emissions control system, what component monitors internal fuel tank pressure? Canister vent solenoid Rollover valve Fuel tank pressure sensor Service port

Fuel tank pressure sensor

What three components on the Pulsa-Jet carburetor serve the same functions as the gravity feed tank, float, and float chamber on a conventional float-type carburetor? Primer, choke, and fuel tube Fuel tank, fuel pump, and constant level fuel chamber Fuel cup, fuel diaphragm, and constant fuel passage Fuel tank, fuel injector, and constant fuel level float

Fuel tank, fuel pump, and constant level fuel chamber

A Stanadyne pump has its own mechanical Plunger Head Sleeve Governor

Governor

What is the feature related to the Flo-Jet carburetor relating to fuel feed? Gravity fed Pressure fed Vacuum fed Pump fed

Gravity fed

Why would you remove the main air jet air bleed on a Pulsa-Jet Prime carburetor? High-altitude compensation Low-altitude compensation Do not really need it Never remove it

High-altitude compensation

Gasoline injection system has several advantages over a carburetor-type fuel system except for ____. Increased engine power Better fuel distribution Higher emissions Improved atomization

Higher emissions

Which exhaust emission is produced when unburned fuel escapes from the exhaust system of a poorly running engine? Particulates Oxide of nitrogen Carbon monoxide Hydrocarbons

Hydrocarbons

What is the proper shutdown procedure of a turbocharger to prevent bearing damage? Idle down then shut off immediately. Idle the engine for a few minutes. Shutdown at high rpm. None of the above.

Idle the engine for a few minutes.

What is the function of the exhaust gas recirculation system? Recirculates engine crankcase fumes back into the combustion chamber Injects burned exhaust gases into the engine to lower combustion temperatures and prevent the formation of NOx Chemically changes combustion by-products into harmless substances Forces outside air into the exhaust system to help burn unburned fuel

Injects burned exhaust gases into the engine to lower combustion temperatures and prevent the formation of NOx

On a PT-type fuel injection system, when should maximum fuel manifold pressure be obtained? At idle Just off idle After the governor cuts in Just before the governor cuts in

Just before the governor cuts in

When reinstalling the inlet needle/fulcrum spring, which is a tedious procedure, you can use what type of grease to help the process? Axle Lithium-based Bearing Teflon-based

Lithium-based

The actuator components of the electronic unit injection system use what kind of action to create the pressures needed for injection? Hydraulic Electronic Mechanical Fluid

Mechanical

What regulates the volume of fuel in the hydraulic head? Metering valve Cam ring Intake valve Metering port

Metering valve

Superchargers pump a greater amount of air into an engine than could be supplied by normal atmospheric pressure. What is the effect on fuel consumption and power? More fuel is burned; power is decreased Less fuel is burned; power is decreased More fuel is burned; power is increased Less fuel is burned; power is increased

More fuel is burned; power is increased

When there is little or no air pressure applied to the AFC diaphragm, the maximum fuel pressure and flow are controlled by what? AFC plunger AFC spring Check valve No-air adjusting screw

No-air adjusting screw

Each time a fuel injection pump is overhauled, which of the following parts is/are always replaced? Springs Seal Seats O-rings and seals Timing plate

O-rings and seals

In a Pulsa-Jet carburetor, the diaphragm separates the air compartment and spring from what compartment? Venturi Oil Lubrication Fuel

Oil

Generation two oxygen sensors are installed where? Only one before the catalytic converter One before or one after the catalytic converter One at the fuel injector and one before the catalytic converter One before the catalytic converter and one after

One before the catalytic converter and one after

The throttle body injection has . One or two injectors delivering diesel fuel from one central point in the intake manifold One or two injectors delivering gasoline from multiple points in the intake manifold One or two injectors delivering gasoline from one central point in the intake manifold One injector delivering gasoline to two central points in the intake manifold

One or two injectors delivering gasoline from one central point in the intake manifold

When may ether be used as a diesel engine cold starting aid? Only in extreme emergencies Only in extreme cold weather Any time When the engine will not start after four attempts

Only in extreme emergencies

During the mechanical governor operation of the distributor injection pump, the flyweights transmit force through the thrust valve, causing the lever to Move upward Pivot Rotate Alternate

Pivot

What is the most common type of service performed on gasoline fuel injection systems? Preventive Interim Injector Depot

Preventive

What is the purpose of the evaporative emissions control system? Makes oil vapors condense and flow into the oil pan Prevents toxic fuel vapors from entering the atmosphere Prevents toxic fuel from entering the cylinders Regulates engine crankcase ventilation

Prevents toxic fuel vapors from entering the atmosphere

What component of the evaporative emissions control system allows the vapors to enter the intake manifold and is pulled into the combustion chambers for burning? Purge line Air dome Purge connector Purge valve

Purge valve

While inspecting the turbocharger, you discover the inner heat shield is distorted. What action should you take? Replace with a new shield. Replace the turbocharger. Reuse, since it will straighten when bolted back on. Heat up and straighten.

Replace with a new shield.

To remove carbon from the PT fuel injector tips, you use which of the following methods? A wire brush Reverse flushing A pin vise and the proper size fine wire Sand paper

Reverse flushing

What is required to start a cold engine with a diaphragm pump? Lean fuel mixture Choke wide open Throttle half open Rich fuel mixture

Rich fuel mixture

On the Stanadyne electronically controlled distribution pump, if one or two sensors fail, the engine will run only at limited power. If all three sensors fail, the engine will Idle down and stop Run only at idle Increase idle Run normally

Run only at idle

What type of governor is installed in a PT fuel pump? Simple flyweight-operated electronic governor Simple flyweight-operated mechanical governor PT pump is unique not having a governor The governor is mounted on the engine separate form pump

Simple flyweight-operated mechanical governor

Which of the following is not a function of the pressure-time governed fuel pump? Control of exhaust smoke during acceleration Idle and maximum speed governing Rail pressure to the injectors Startup of the engine

Startup of the engine

For the Bimetal choke, the springs have been color coded according to their _______. Function Gauge Length Strength

Strength

The main components of a fuel injection pump using a sleeve metering fuel system is The housing, plunger, and bushing The body, barrel, and filter The plunger, sleeve, and casing The barrel, plunger, and sleeve

The barrel, plunger, and sleeve

On the enhanced evaporative emissions control system, what happens when the system is in diagnostic mode? The control module closes the vent solenoid, blocking air flow into the canister. The control module opens the vent solenoid, blocking air flow into the canister. The control module closes the vent solenoid, allowing air flow into the canister. The control module opens the vent solenoid, allowing air flow into the canister.

The control module closes the vent solenoid, blocking air flow into the canister.

In the PT fuel pump injector operation, when the cam follower roller is on the inner base circle, The injector return spring lifts the plunger. The plunger lifts the return spring. The check ball moves upward. The plunger moves downward.

The injector return spring lifts the plunger.

In the discharging cycle of the distributor injection pump, as the rotor continues to revolve, the inlet passages move out of alignment with the charging ports. What happens next? The rotor closes the discharge port to the heads inlet. Fuel is trapped between the plungers. The rotor discharge port opens one of the heads outlets. The rotor injection port closes one of the heads inlets.

The rotor discharge port opens one of the heads outlets.

The engine's power output can be controlled by the operator, within the established governor limits through the use of what? The throttle The rail Governor link

The throttle

Which sensor is important for determining computer output? manifold absolute pressure sensor Throttle position sensor Engine coolant temperature sensor Airflow sensor

Throttle position sensor

In reference to the PT fuel system, what does the T refer to? Time elapsed between injections Time for fuel to flow into injector body Time between piston strokes Time available for the fuel to flow into the injector cup

Time available for the fuel to flow into the injector cup

Why is it imperative for a proper seal of the pump gasket between the fuel intake chamber, pulse chamber, and the inlet and outlet valve area on a diaphragm pump? To prevent cross-leaking To prevent air choke To prevent fuel choke To prevent oil leak

To prevent cross-leaking

When the engine is running, the pump rotates and fuel is pulled into the end plate by the Bypass valve Transfer pump Pump piston Plunger

Transfer pump

An electronic unit injector's start and duration of injection is controlled by the pulse width from the ECM. True False

True

An over run occurs when the governor allows the engine to exceed its maximum rated speed. True False

True

Diesel engines can become "dependent" upon ether. True False

True

Lapping compound to remove corrosion is one of the options restore a nozzle of a two-piece Flo-Jet carburetor. True False

True

Some energized-to-run systems employ a mechanical override device for emergency use if the coil becomes inoperative due to electrical failure. True False

True

The aneroid controls the exhaust emissions by creating a lag in the fuel system equal to that of the turbocharger. True False

True

The bowl vent may be an external or internal type. True False

True

What are the three primary components of a turbocharger? Turbine wheel, center housing, and compressor wheel Turbine shaft, center support, and injectors Exhaust tube, air pump, and compressor tube Turbine housing, air injection, and compressor shaft

Turbine wheel, center housing, and compressor wheel

During the initial adjustment of a diaphragm pump, after closing the high-low speed mixture needles, what is the next procedure? Turn them clockwise to unseat them. Turn the idle screw about 1½-turns. Turn the screws outward about 1½-turns. Turn the screws inward about 1½-turns.

Turn the screws outward about 1½-turns.

Once removing the packing nut and high-speed needle valve, what tool do you use to remove the nozzle? Tapered screwdriver Un-tapered screwdriver Phillips screwdriver Needle-nose pliers

Un-tapered screwdriver

When servicing a PT fuel injector, you should NOT take which of the following actions? Use cleaning solvent. Use cleaning wire. Use mineral spirits. Soak the orifices to remove carbon.

Use cleaning wire.

What is the function of the liquid-vapor separator in the evaporative emissions system? Used to keep fuel from entering the evaporative emission system Carries fuel vapors to a charcoal canister Stores fuel vapors when the engine is not running Prevents fuel vapors from entering the atmosphere

Used to keep fuel from entering the evaporative emission system

In a diaphragm pump, what type of tip may the inlet needle have to resist exotic fuels and wear? Viton Brass Rubber Carbon steel

Viton

When rebuilding a PT-type fuel pump, parts should be discarded at what point? When they only show minor wear Only after they break When they are worn beyond replacement limits At each overhaul

When they are worn beyond replacement limits

The fuel injector for an EFI system is simply what? a coil- or solenoid-operated fuel valve a regulated fuel injector a coil- or diode-operated fuel tap a fuel valve only

a coil- or solenoid-operated fuel valve

Which component of the carburetor holds the fuel for use by the different metering circuits? metering tube bowl vent fuel container fuel passages

fuel container

What is the component that connects the carburetor's bowl to the engine side of the throttle plate? high-speed air bleed idle passage idle air bleed bowl vent

idle passage

Which carburetor system lifts the diaphragm both mechanically and pneumatically? choke primer emission enrichment

primer

When using the model number of a Briggs & Stratton carburetor, which number is used to identify the type of carburetor? first second third fourth

third

Any pressure less than atmospheric pressure is generally referred as what? combustion flow vaporization vacuum

vacuum

The narrowed portion of the carburetor is known as what? venturi bernoulli throttle vortex

venturi

When you are testing a Stanadyne fuel injection pump, a reading of how many inches of vacuum indicates a restricted fuel supply? 7 8 9 10

10

The final adjustment on a Vacu-Jet carburetor specifies what rpm? 1675 1700 1750 1775

1750

If you do not have the specification settings available for the final adjustments of the diaphragm carburetor, you can set the idle between what rpm. 1500 and 2000 2000 and 2500 2500 and 3000 3000 and 3500

2500 and 3000

When a PT pump has been rebuilt, it should be run at 1,500 rpm for how long to allow the bearings to seat? 2 minutes 5 minutes 10 minutes 15 minutes

5 minutes

After normal start-up, at what rpm does the governor take over in a Caterpillar sleeve metering fuel injection pump? 300 400 500 600

500

The type governor that will most likely be found on a Caterpillar bulldozer is A limiting speed governor A variable speed governor A constant speed governor A wavering speed governor

A variable speed governor

In the Stanadyne pump, before reaching the transfer pump the fuel must pass through which components? A water separator and inlet ports A water separator only A water separator and primary fuel filter A water separator and secondary fuel filter

A water separator and secondary fuel filter

In a Pulsa-Jet carburetor, what is one the design variations? Adjustable and non-adjustable jets in the fuel pickup Non-integral venturi Non-vented fuel tanks Choke plate shaft dust stop

Adjustable and non-adjustable jets in the fuel pickup

Hunting or surging is a continuous engine speed fluctuation and can be controlled by a/an Adjustable spring Bumper screw Adjustable screw or bumper screw Adjustable screw or bumper spring

Adjustable screw or bumper spring

The PCV valve controls the air through the PCV system. It can be located in any of the following locations except the Valve cover Intake manifold Side of the engine block Air breather

Air breather

You need to take special care of the PT fuel pump when disassembling it because is made of Plastic Cast iron Aluminum Bronze

Aluminum

In a Caterpillar sleeve metering fuel injection system, fuel injection begins at what point? As the plunger moves upward and closes the inlet port As the plunger moves downward and closes the inlet port As the barrel moves upward and closes the inlet port As plunger moves upward and closes the outlet port

As the plunger moves upward and closes the inlet port

What component does the wet bulb primer eliminate the need of on the Pulsa-Prime carburetor? Manual choke Automatic choke Pump diaphragm Automatic fuel pump

Automatic choke