Components
What is the purpose of the fuel filter in a vehicle?
Filter out debris and contaminants that may be in the fuel
Define a lean air-fuel mixture
What does the octane rating indicate about gasoline?
The higher the octane the more the fuel resists detonation under pressure.
What should you do before opening the fuel fill door?
Turn off the vehicle and start the transaction at the pump
Why is maintaining proper tire pressure important for fuel economy?
The flatter your tires, the more power needed to go so the more fuel used.
What is the purpose of the fuel pump?
To pump fuel from the tank into the fuel lines.
Explain what a rich air-fuel mixture is.
Less air than recommended in the ratio. More fuel
What is knocking in relation to gasoline engines?
Vibrations, premature fuel ignition
Why is it important not to overfill the fuel tank?
Allow fuel to expand from pressure
How often should you change the oil to ensure good fuel efficiency?
According to your user manual
What does the PCM do in the fuel system?
Reads info from sensors to adjust the fuel system as needed
What is a benefit of diesel fuel engines over gasoline?
Last longer, no spark plugs, don't have to turn off at the pump
How do additives in gasoline help improve performance?
reduce rust and knocking
What should you do if you hear a hissing sound when removing the gas cap?
Slowly remove the cap and let the pressure regulate
What effect does excessive idling have on fuel economy?
You are using fuel to run accessories but not travel anywhere
What part of the fuel system determines power output?
Throttle body or valve
What is a benefit of gasoline engines over diesel?
Quieter, cheaper, can have ethanol
Why do higher compression engines require higher octane fuel?
They need a fuel that will not ignite prematurely
What should you do if a fire breaks out or if the pump continues to pump gas even after shut off?
Locate and press the emergency shut off valve. If a small fire, find a fire extinguisher next to the pump. Large fire, evacuate and call 911.
Why is it beneficial to moderate your speed while driving?
Less power used means less gas used.
Identify the three types of fuel injectors used in modern vehicles.
Throttle Body Injection, Direct Injection, & Multi Point Fuel Injection
Mass Airflow Sensor, Idle Speed Control, Throttle Position Sensor, Fuel Pressure Regulator, Temp Sensors
What does Gasohol contain?
Up to 10% Ethanol
How do you know what side your fuel tank filler is on if you have never driven the vehicle before?
The arrow indicator on the dash
What is one way to increase fuel economy that was not mentioned above?