Exam 8: Diesel Fuel and Low Pressure Fuel Systems

Which of these diesel fuel additives prolong storage life; minimize oxidation; reduce gums, resins, and sediments; and improve injector spray patterns?

Technician A says that older diesel fuel darkens and turns cloudy as it absorbs gasoline. Technician B says that old diesel fuel develops a varnish or turpentine-like odor. Who is right?

Which one of the following is pure biodiesel and can be used as fuel?

Which of the following is NOT an advantage of biodiesel?

Which of the following is NOT a disadvange of using biodiesel?

Two diesel technicians are discussing diesel fuel corrosion inhibitors. Technician A says that due to the sulfur content of diesel fuel, it can lighten materials made of copper and bronze, forming a gooey coating on these parts. Technician B says that because many fuel tanks and lines are made of steel, the interior and both metal fittings and filter housings can rust or corrode. Who is right?

One notable exception to the emission benefits of biodiesel is that it can produce higher levels of ______ from some engine families.

The service life of injection pumps, injectors, fuel transfer pumps, and other fuel system components can be prolonged through the use of:

Which of the following is NOT an environment benefit of using biodiesel?

A primary fuel filter will typically have ___________.

Gasoline will easily vaporize and burn at:

What is the cetane number (CN) for ultra low sulphur diesel (ULSD) #2D?

Which of the following is the result of water contaminating fuel?

Diesel fuel with a cetane number (CN) of 50 or greater has which of the following characteristics?

Technician A says that 2-D fuel provides the most power and best fuel economy for an on-highway diesel engine. Technician B says that 1-D is the best fuel for producing power and good fuel economy. Who is correct?

What color is aviation fuel dyed?

In the oil refining process of boiling and vapor separation, where does diesel fuel come from?

Technician A says straight vegetable oil (SVO) can be burned in a diesel engine without causing any long-term problems for engine durability. Technician B says SVO will damage injectors. Who is correct?

Two technicians are discussing the low pressure fuel system. Technician A says that it supplies an adequate volume of fuel at the correct pressure to the high-pressure injection system. Technician B says that it prevents wax gelling and regulates fuel temperature. Who is right?

What can be used to inspect for air in the suction side of the fuel system?