5. Which of these items will least likely increase pressure in the evaporative emission control system?
A. Volatility of the fuel
B. Returned fuel from the fuel-injection system
C. Fuel temperature
D. Inlet fuel to the fuel pump
11. A vehicle has a crimped fuel return line. What effect will this have on 5-Gas Analyzer gas readings?
A. HC decreases
B. CO decreases
C. O2 increases
D. NOx stays the same
12. Technician A says that the most efficient method of EVAP system leak detection is introducing smoke under low pressure from a machine specifically designed for this purpose. Technician B says that nitrogen gas pressurization uses nitrogen gas under a very low pressure (lower than 1 psi) in the fuel system; you listen for escaping air with amplified headphones. Who is correct?
A. Both Technicians A and B
B. Technician A
C. Technician B
D. Neither Technician A nor B
13. To avoid excessive catalyst temperatures and the possibility of fuel vapors reaching the converter, the following rules are being discussed: Technician A says that it's okay to use any fuel additives or cleaners in the fuel system. Technician B says that you should repair engine problems such as dieseling, misfiring, or stumbling as soon as possible. Who is correct?
A. Both Technicians A and B
B. Neither Technician A nor B
C. Technician A
D. Technician B
15. Two technicians are discussing the evaporative emission monitor. Technician A says that serious monitor faults cause a blinking malfunction indicator lamp (MIL) or even an engine shutdown. Technician B says that the engine computer will run the EVAP monitor when fuel level is within 15 to 25 percent and the TP sensor position is between 9 and 10 percent. Who is correct?
A. Both Technicians A and B
B. Technician A
C. Technician B
D. Neither Technician A nor B
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