Low Pressure Fuel Systems

At too low of a temperature, the __________ in fuel becomes too viscous to properly flow through filters and lines.

• a.Gel

• b.Cetane

• c.Paraffin

• d.Water

Technician A says that low diesel fuel temperature causes problems, but high fuel temperatures are not a problem. Technician B says that both low and high fuel temperature can cause problems with diesel fuel. Who is correct?

Select one:

• Tech a

• Tech b

• Both

• Neither

Which of the following statements is correct concerning fuel tank ventilation?

Select one:

• Require some ventilation to the atmosphere

• Must be completely sealed

• Both A & B

• Neither A or B

A fuel tank pickup tube works by means of __________.

Select one:

• a.Gravity

• Pressure

• Venturi Effect

• Head Pressure

Technician A says that fuel-water separators, water-in-fuel sensors, fuel heaters, and filters are often integrated into a single compact unit. Technician B says that water-in-fuel (WIF) sensors use an electrical conductivity probe to sense a specific level of water in fuel and cause a dash-mounted light to illuminate. Who is correct?

Select one:

• Tech A

• Tech B

• Both

• Neither

Which of the following statements is correct with regard to priming fuel systems?

Select one:

• a.A fuel system should be primed whenever fuel filters are replaced.

• Dont need to be primed

• Both A & B

• Neither

Technician A says that deteriorated check valves can effect outlet pressure of a mechanical diaphragm pump. Technician B says the diaphragm pumps are not used in diesel engine fuel systems. Who is correct?

Select one:

• Tech A

• Tech B

• Both

• Neither

Which acronym is associated with Detroit Diesels diagnostic software system?

• DDDL

• FSIC

• DDFS

• DFSIC

All of the following are functions of the low-pressure fuel system, EXCEPT __________.

Select one:

• a. Store and supply an adequate volume of clean fuel

• b.Prevent wax gelling

• c.Regulate fuel temperature

• d.Inject fuel into the combustion chamber

Low-pressure fuel systems include features to inform the operator of _________________. 

Select one:

• a.Fuel tank level

• b.Fuel system pressure

• c.Fuel line integrity

• d.Fuel condition