WorksheetsAUT108 Fuel Management Systems
Total questions: 20
Worksheet time: 10mins
A high percentage of oxygen may mean _________.
Too little fuel is entering the engine
The mixture is too lean
Lambda is greater than 1
All of the above
Tech A states that an engine can burn liquid fuel efficiently to produce power. Tech B states that the liquid fuel must be vaporized fully before it can be ignited. Who is correct?
Atmospheric pressure is _____ psi at sea level.
21
10.7
14.7
687
All of these are advantages of electronically controlled fuel injection over mechanical injection systems EXCEPT:
continuous air fuel adjustments are possible.
reduced emissions are achieved
fuel can be delivered in a continuous stream.
reduced fuel consumption is achieved.
Types of fuel line connections include all of these EXCEPT:
banjo bolt fittings.
quick couplings.
flare fittings.
compression fittings.
The pressure between the pump and the injectors can be maintained by _________.
Varying the speed of the pump
Input from the driver
Both A and B
None of the above
The ________ design uses a one-way valve to hold pressure in the system while the pressure tester is connected and disconnected to the fuel rail.
O-ring valve
Quick-connect valve
Schrader valve
Fuel pressure tester valve
The ______ can also prevent small amounts of water from getting past it because the paper absorbs the water, causing the fibers in the filter to swell.
Plastic filter
Fine mesh filter
Paper filter
None of the above
Sequential injection means injection occurs in the sequence of the firing order.
Which of the following is NOT one of the three basic EFI systems?
Throttle body injection
Multipoint fuel injection
Computer-controlled carburetor injection
Gasoline direct injection
In GDI engines, which of the following is the least risky way to remove the carbon on intake valves and runners, especially if the buildup is very heavy?
Removing the cylinder head, disassembling it, and cleaning it
Removing the intake manifold and using a crushed walnut shell blaster to blast away the carbon
Removing the intake manifold and using a chemical cleaner to soften and dissolve the carbon so it can be removed
Induction cleaning
The filter's primary function is to prevent contaminants from reaching the injectors.
The diaphragm spring moves the diaphragm up, forcing fuel from the ______ out of the ______ and into the ______.
Carburetor; pumping chamber; pump
Pumping chamber; pump; carburetor
Carburetor; pump; pumping chamber
Pump; pumping chamber, carburetor
When ______ fuel is needed, pressure ______ in the fuel line to the carburetor and in the pumping chamber.
More; builds up
Less; reduces
Less; builds up
None of the above
What is the purpose of the venturi?
To make the air speed up as it passes through
To ensure the proper air fuel mixture is available
To provide extra fuel for accelerating
To make sure an adequate supply of fuel is available
This type of carburetor system uses various sensors in the exhaust and engine to monitor operating conditions.
Two-barrel carburetor
Progressive carburetor
Computer-controlled carburetor
Four-barrel carburetor
Tech A says that most electric fuel pumps are now mounted inside of the fuel tank. Tech B says that fuel flows through the center of the electric pump and is used to cool the pump. Who is correct?
Tech A says that measuring the alcohol content in gasoline involves using water. Tech B says that as long as the fuel pressure is correct, you don't have to worry about fuel pump volume. Who is correct?
Tech A says that fuel pump pressure can often be tested by accessing a test port. Tech B says that fuel pump volume can be affected by the condition of the fuel injectors. Who is correct?
Tech A says the GDI engines inject the fuel directly into the intake manifold. Tech B carbon build up is a big downside to direct injection. Who is correct?
