CM A Ch. 5 Fuel System Overhaul

When testing for catalutic converter efficiency, you know there is enough oxygen for the catalyst to burn emissions if the oxygen readings are above what percentage?

5

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

5 miinutes

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

500

The PCV valve controls the air through the PCV system. It can be located in any of the following locations except______.

Air Breather

A lazy O2 sensor will not__________ its output signal fast enough to maintain an efficient air-fuel ratio.

Alter

You need to take special care of the PT fuel pump when dissassembling it because it is made of_______.

Aluminum

On the enhanced evaporative emissions control system, what component monitors internal fuel tank pressure?

Fuel tank pressure sensor

What three components on the Pulsa-Jet carburetor serve the same functions as gravity feed tank, float, and float chamber on a conventional float-type carburetor

Fuel tank, fuel pump, and constant level fuel chamber

What is the feature related to the Flo-Jet carburetor relating to fuel feed?

Gravity fed

While conducting a test on a vacuum type EGR system, you plug the supply vacuum line to the EGR valve and apply vacuum with a hand pump. What should the engine do?

Begin to miss or stall

Why would you remove the main air jet air bleed on a pulsa-Jet Prime carburetor?

High-altitude compensation

Gasoline injection system has several advantages over a carburetor-type fuel system except for ___________.

Higher Emissions

Which exhaust emission is produced when unburned fuel escapes from the exhaust system of a poorly running engine?

Hydrocarbons

What is the component that connects the carburetor's bowl to the engine side of the throttle plate?

Idle Passage

What is the function of the exhaust gas recirculating system?

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?

Just before the governor cuts in

White smoke is caused by consdensing_________.

Liquid

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

Lithium-Based

The acturator components of the electronic unit injection system use what kind of action to create the pressures needed for injection?

Mechanical

What regulates the volume of fuel in the hydraulic head?

Metering valve

The following are types of catalytic converters except which one?

Mini-Stage

What determination does the ECM make when a titania oxygen sensor's voltage drops below the predetermined value?

Mixture too lean

Superchargers pump a greater amount of air into n engine than could be supplied by normal atmospheric pressure. What is the effect on fuel consumption and power?

More fuel is burned; power is increased

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____________.

Run only at idle

What type of governor is installed in a PT fuel pump?

Simple flyweight-operated mechanical governor

What is the difference between a single-stage EGR and a multi-stage EGR

Solenoids

What is the idea behind the DPF?

Soot collects on the walls, then burned off

Which of the following is not a function of the pressure-time governed fuel pump?

Startup of the engine

How does the dual-bed catalytic converter dispose of the NOx emissions?

Stores then burns off to harmless by-product

For the Bimetal choke, the springs have been color coded according to their__________

Strength

When rebuilding a PT-type fuel pump, parts should be discarded at what point?

When they are worn beyond replacement limits

The fuel injector for an EFI system is simply what?

a coil- or solenoid- operated fuel valve

During the mechanical governor operation of the distributor injection pump, the flyweights transmit force through the thrust valve, causing the lever to _____________.

pivot

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?

delivery valve

When you are testing a stanadyne fuel injection pump, a reading of how many inches of vacuum indicates a restricted fuel supply?

10

The final adjustment on a Vacu-Jet carburetor specifies what rpm?

1750

When testing the air pump on the air injection system, it should typically produce how much pressure?

2-3 PSI

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.

2500 and 3000

While running a test on an electronic type EGR System and after going through the procedures, what should check for after checking the condition of the windings and no voltage is indicated?

A.Check for bad electrical connection. B.Check the ECM D. Both A and B<<<

In a Pulsa-Jet carburetor, what is one of the designs variations?

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 screw or bumber spring

What component does the wet bulb primer eliminate the need of on the Pulsa-Prime carburetor?

Automatic Choke

The difference between the oxygen content in the inner cavity and the oxygen content of the exhaust gases flowing through the sensor's outer surface causes the sensor to generate_______.

Backpressure

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

Which sensor sends an electronic signal proportional to the pressure inside the rail to the ECU?

Fuel pressure sensor

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

C. Both A and B

How is the fuel pump actuated on the Pulsa-Jet fuel carburetor?

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?

Circulating coolant heater

What is the system on a diesel engine which is comparable to the PCV on gasoline engines?

Closed crankcase ventilation

In the Delphi EUI, what component is a solenoid consisting of a coil and armature with an integral poppet control valve?

Control cartridge

After the engine starts under cold conditions using a glow plug, how does the glow plug turn off?

Control circuit disconnects glow plug

On the EGR System, what component may be used to prevent exhaust gas recirculation when the engine is cold?

Coolant temperature switch

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 with the fuel supply chamber

What is the component that sends compressed fresh air to the intake manifold?

Crossover tube

Which manufacturer developed the pressure-timed fuel injection system?

Cummins

Before undertaking a snap test, what needs to be considered relating to the exhaust stack?

Diameter

Which carburetor has the ability to be used regardless of the position of the fuel tank?

Diaphragm with Pump

When the oxygen sensor is determined to be defective, what shall be done first before removing it?

Disconnect the negative battery cable

What component of the air injection system keeps air from entering the exhaust system during deceleration?

Diverter

Where on the engine is the lubricating oil heater generally installed?

Drain Plug and Dipstick Opening

The Governor may be equipped with a/an ___________ housed within the governor control cover.

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 unit injectors

Scavenging takes place during which strokes in a two-cycle engine?

End of downstroke; beginning of upstroke

During which stroke(s) is the metering orifice uncovered and fuel flows into the injector cup?

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 blowby

(T/F) A pyrometer is an instrument only used by the mechanic.

False

(T/F) Another procedure to check the PCV valve is to suck on it to check operation.

False

(T/F) Lack of engine power; blue smoke, and increased engine power are some of the symptoms of a turbocharger problems.

False

(T/F) On a Vacu-Jet carburetor, multiple fuel pickup tubes are one of the design features.

False

(T/F) On the throttle body injection system, the fuel injector is a cam-operated fuel valve.

False

(T/F) The automatic choke on the Vacu-Jet and Pulsa Jet carburetors is opened by atmospheric pressure in front of the venturi.

False

(T/F) The oxygen sensor functions immediately when the vehicled is started.

False

Maintenance on an evaporative emissions control system typically involves cleaning or replacing which component?

Filter in the charcoal canister

To prevent goring of the PT fuel pump and pump parts in assembly, the mechnaic should use which of the following means?

Flat steel washers

What is one of the causes for carburetor leak ona Flo-Jet carburetor that is typically caused by transport?

Float-bounce

The primary oxygen sensor holds what designation and is located where?

Front O2; near the engine

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

Fuel

Which component of the carburetor holds the fuel for use by the different metering circuits?

Fuel container

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?

Fuel leak at the diaphragm

If the air cleaner flap does not function on the thermostatic air cleaner, what components should be checked first?

Vacuum motor and temperature sensor

When there is little or no air pressure applied to the AFC diaphragm, the maximum fuel pressure and flow are controlled by what?

No-air adjusting screw

Each time a fuel injection pump is overhauled, which of the following parts is/are always replaced?

O-Rings and seals

Generation two oxygen sensors are installed where?

One before the catalytic converter and one after

The throttle body injection has____________.

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

The exhaust gas recirculation system lowers the amount of what emission in the engine exhaust?

Oxides of nitrogen

Opacity meter readins are displayed in_____________.

Percentages

Currently, there are three types of diesel particulate filters as listed below except which one?

Precatalyzed

What is the most common type of service performed on gasoline fuel injection systems?

Preventive

What is the purpose of the evaporative emissions control system?

Prevents toxic fuel vapors from entering the atmosphere

Which carburetor system lifts the diaphragm both mechanically and pneumatically?

Primer

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 valve

While inspecting the turbocharger, you discover the inner heat shield is distorted. What action should you take?

Replace with a new shield.

To remove carbon from the PT fuel injector tips, you use which of the following methods?

Reverse flushing

What may be one of the symptoms of a clogged catalytic converter?

Rotten egg odor

The narrowed portion of the carburetor is known as what?

Venturi

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

The Throttle

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.

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

Viton

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.

In the discharging cycle of the distributor injection pump, as the rotor continues to revolve, the inlet passages move out of alignment iwht the charging ports. What happens next?

The rotor discharge port opens one of the heads outlets.

What component is normally located in the thermostatic air cleaner to control the vacuum motor and heat control door?

Thermal vacuum valve

when using the model number of a briggs and stratton carburetor, which number is used to identify the type of carburetor?

Third

Which sensor is important for determining computer output?

Throttle position sensor

In reference to the PT fuel system, what does the T refer to?

Time available for the fuel to flow into the injector cup

When the engine is running, the pump rotates and fuel is pulled into the end plate by the _________.

Transfer pump

(T/F) An electronic unit injector's start and duration of injection is controlled by the pulse width from the ECM.

True

(T/F) An over run occurs when the governor allows the engine to exceed its maximum rated speed.

True

(T/F) Diesel engines can become dependant upon ether.

True

(T/F) Lapping compound to remove corrosion is one of the options restore a nozzle of a two-piece Flo-Jet carburetor.

True

(T/F) One very basic and simple way to quickly test a PCV valve is to pull it from the engine and see if it rattles when shaken.

True

(T/F) Some engergized-to-run systems employ a mechanical override device for emergency use if the coil becomes inoperative due to electrical failure.

True

(T/F) The aneroid controls the exhaust emissions by creating a lag in the fuel systems equal to that of the turbocharger.

True

(T/F) The bowl vent may be an external or internal type.

True

(T/F) The oxygen sensor monitors the exhaust gases for oxygen content.

True

What are the three primary components of a turbocharger?

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 the screws outward about 1 1/2- turns

Once removing the packing nut and high-speed needle valve, what tool do you use to remove the nozzle?

Un-tapered screwdriver

When servicing a PT fuel injector, you should NOT take which of the following actions?

Use cleaning wire

What is the function of the liquid-vapor seperator in the evaporative emissions system?

Used to keep fuel from entering the evaporative emission system

Any pressure less than atmospheric pressure is generally referred as what?

Vacuum

The type of governor that will most likely be found on a caterpillar bulldozer is __________.

a variable speed governor.

In the stanadyne pump, before reaching the transfer pump the fuel must pass through which components?

a water separator and the secondary fuel filter

In a caterpillar sleeve metering fuel injection system, fuel injection begins at what point?

as the plunger moves upward and closes the inlet port

A stanadyne pump has its own mechanical__________.

governor

What is the proper shutdown procedure of a turbocharger to prevent bearing damage?

idle the engine for a few minutes.

What is required to start a cold engine with a diaphragm pump?

rich fuel mixture

The main components of a fuel injetion pump using a sleeve metering fuel system is__________.

the barrel, plunger, and sleeve

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 on a diaphragm pump?

to prevent cross-leaking