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