DSL-202 Chap 15: Low Pressure Fuel- Systems

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

• Gel

• Cetane

• Paraffin

• Water

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

• Fuel condition 0

• Fuel line integrity

• Fuel system pressure

• Fuel tank level

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

• Prevent wax gelling

• Regulate fuel temperature

• Store and supply an adequate volume of clean fuel

• Inject fuel into the combustion chamber

Fuel system gear pumps are of the __________ design.

• Gravity

• Positive displacement

• Return flow

• Nonpositive displacement

Where are mechanical vane-type pumps usually located?

• Frame

• Fuel Tank

• Injection Pump

• Engine Block

A fuel return check valve __________.

• Limits fuel pressure

• Prevents drain back

• Flows fuel to the fuel tank

• All of these are correct

Pressure of fuel delivery out of a positive displacement pump increases as __________

• Engine RPM increases

• Filter restriction increases

• Engine RPM deceases

• Road speed of vehicle increases

Technician A says that restriction occurs across the fuel filter when it begins to load with contaminants. Technician B says that filtercontamination can be check by connecting a vacuum gauge with a T-fitting or service port between the transfer pump and primary filter.Who is correct?

• Neither Technician A nor Technician B

• Both Technician A and Technician B

• Technician A

• Technician B

Which is the recommended tool when performing primary fuel system inspection?

• Sight Glass

• Pressure Gauge

• Restriction Gauge

• Pressure Differential Gauge

Technician A says that any air in the fuel system will prevent the fuel from properly pressurizing. Technician B says that if there is air inthe fuel system, the engine will quit or not start at all. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B