FUEL HELP - Types of alcohal/gas - mixtures CNG, E85, Methanol - Lumina vfv fuel rail - AIR FUEL RATIO?
CNG has a ________ octane rating than gasoline and burns ________ than gasoline.
higher; faster
higher; slower
lower; faster
lower; slower
2. What is the typical air-fuel ratio of CNG-equipped vehicles?
18.0:1
16.5:1
12.0:1
14.7:1
3. Technician A says symptoms of exposure to methanol fuel occur immediately after exposure. Technician B says some symptoms may not occur for several hours after exposure. Which technician is correct?
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
4. Technician A says the Lumina VFV fuel rail is yellow anodized to make it impervious to methanol. Technician B says the aluminum fuel rail is lined with water resistant paint. Which technician is correct?
Technician A only
Technician B only
5.The energy content of methanol is approximately ________ that of gasoline:
60 percent
85 percent
25 percent
15 percent
6.Which of the following materials is LEAST affected by methanol?
Zinc
Aluminum
Rubber
Teflon
7.Compressed natural gas (CNG) is comprised mostly of:
Methanol
Butane
Methane
Ethanol
8.The fuel composition sensor measures:
ethanol percentage
fuel temperature
fuel density
Both A and B
9.Technician A says the operating resistance of Ford FF injectors is 2 ohms. Technician B says their resistance is 1 ohm. Which technician is correct?
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
10.Ford M85 fuel system pressure can be checked with a pressure tester that reads:
41 to 55 psi (284 to 376 kPa)
48 to 55 psi (333 to 376 kPa)
45 to 60 psi (310 to 415 kPa)
41 to 47 psi (284 to 325 kPa)
11.Technician A says that at the stoichiometric air-fuel ratio of 14.7 to 1, combined O2 and CO readings on a 4-gas analyzer should be approximately 14.7%. Technician B says that CO2 should be high and O2 should be low. Which technician is correct?
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
12.The GM variable fuel sensor also senses fuel:
Water content
Consumption
Percentage of alcahol
Flow
13.Which of the following devices prevents siphoning fuel from the tank of a VFV Lumina?
A check ball in the tank filler tube
An arrester in the filler hose
A fuel tank pressure vent valve
All of the above
14.The GM variable fuel sensor contains a variable capacitor and electronic circuitry to determine the percentage of:
Methanol
Water contamination
Unleaded gasoline
None of these
15.Technician A says the variable fuel sensor on a 1992 Lumina VFV is removed by disconnecting the threaded hose fittings. Technician B says the variable fuel sensor on a 1991 Lumina VFV is removed by using the quick-connect fittings. Which technician is correct?
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B