An average mixture of air to gasoline for a moderate cruising speed is approximately
The maximum amount of pressure the fuel pump exerts on the fuel line to the carburetor depends on the
The advantage of an electric fuel pump over a manual fuel pump is that the electric fuel pump can
The device that controls fuel entry into a carburetor by adjusting a needle position relative to its seat in a fuel bowl is known as a (n)
The main discharge tube runs from the __________ __________ through the metering jets, to the air intake above the carburetor venturi.
The carburetor''s low speed circuit functions when the vehicle is at low speed and
The item used to create a vacuum at the venturi strong enough to draw a substantial amount of fuel from the main discharge nozzle when cranking, is know as a (n)
The item used to prevent a "flat spot" or "hesitation" and inject more fuel when the throttle is snapped to the full open position is known as a(n):
There are three types of vacuums created by an engine and carburetor: 1. in the intake manifold below the throttle plates, and 2. in the carburetor''s venturi, and 3. the ported vacuum.
A loose carburetor mounting to the intake manifold may cause
How many "circuits" are there in most automotive carburetors?
On sequential gasoline multiport fuel injection systems, the fuel injectors inject fuel
A mass airflow sensor (MAF) may use a ______________ to determine air flow.
The primary function of the throttle air bypass valve is to control ________________'
When does the idle air control valve (IAC) control airflow?
One important function of the inertia switch is to control power to the ____________ in the event of an accident.
Engine coolant and charge air temperature sensors are both _____________ type sensors.
Throttle position sensors (TPS) provide a(an) _____________voltage signal.
NOx emissions may be reduced by
O2 sensors can be contaminated by
Fuel quantity is controlled by the PCM by signalling injector _______________.
Technician A says that a Mass Airflow Sensor may use a hot wire or heated film. Technician B says that a Mass Airflow Sensor may use a potentiometer. Which one is correct?
Throttle body fuel injection uses one injector for each cylinder in the engine.
All multi-port fuel injection systems use sequential firing, timed to the engine firing order.
Technician A says that fuel regulators are always on the upstream (inlet) side of the injector. Technician B says that the fuel pressure regulator outlet is incorporated into the fuel lines returning to the tank. Which one is correct?
Technician A says that when the vehicle is not running there is no fuel pressure at the injectors. Technician B says that if the system is working properly, there should be residual pressure but it will be different on throttle body and multiport system. Which one is correct?
To prevent a buildup of excess pressure in the fuel tank, older style filter caps may have
To help prevent the formation of vapor in the fuel line, some filters and/or fuel pumps will have
Generally, with a mechanical fuel pump, motion is provided to the diaphragm by
All fuel line in the vehicle that are attached to the frame or engine are made of specialized composite materials or
In a carburetor, when air flows through and leaves the venturi, the velocity will tend to
The ability of a fuel to evaporate is called
The complete combustion of the precisely controlled fuel and air mixture in the engine cylinders is called stoichiometric ratio.
During heavy load operation the engine will require
Before beginning any service on the fuel system you should
Exhaust gas analyzers are designed to read emissions from the vehicle after combustion has occurred.
The two most important tests performed on a mechanical fuel pump are
For safety reasons, before removing any fuel system components you should
When diagnosing a poor operation complaint, and before opening any fuel system for repair, you should always check to make sure that there are not other basic problems with the vehicle''s primary and secondary electrical systems.
Fuel delivery to the cylinders within a modern computerized fuel system is achieved by using
One factor that allows accurate vehicle operation, is that the computer is constantly changing the ignition timing and fuel delivery to account for changes in vehicle operation.
The sensor that indicates changes due to temperature is the
A throttle position sensor is an example of a
The oxygen sensor monitors
Before disconnecting the battery on a computer controlled vehicle, you should
You can check the operation of each fuel injector solenoid by
Throttle body injection units are sealed for life and never need service.
When someone makes reference to open loop computer control, this means
A gasoline engine''s knock sensor may be
The PCM can determine the vehicle is in the deceleration mode by which of the following sensors?
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