Final Review

The fuel pump check valve is normally located in the fuel rail.

False

The ideal air/fuel or stoichiometric ratio for a gasoline engine is approximately _____ pounds of air mixed with 1 pound of gasoline.

14.7

Possible causes for a no-start condition on a coil-over-plug EI engine are being discussed. Technician A says a faulty crankshaft sensor may prevent the engine from starting. Technician B says a shorted ignition coil may be the cause. Who is correct?

A only

A plugged fuel filter will cause ______.

All the answers are correct

Excessive alcohol in the fuel may cause ______.

All the answers are correct.

In Chrysler EFI systems, the ASD relay (automatic shutdown) controls the power to the ______.

All the answers are correct.

Methanol can be made from ______.

All the answers correct

Fuel additives are being discussed. Technician A says adding oxygenates to gasoline increases fuel economy. Technician Bsays adding 10 percent ethanol to gasoline may boost the octane rating 2.5 to 3 points. Who is correct?

B only

Technician A says a lean mixture burns faster than a rich mixture. Technician B says advanced ignition timing induces knock. Who is correct?

B only

What is the effect(s) of adding alcohol to gasoline?

Both A and B

Which of the following statements is false?

Carbon tracking usually occurs in the primary ignition circuit

Quick-disconnect fuel line fittings are sealed by a(n) ____________________ inside the female connector.

O-ring

Compressed natural gas (CNG) is the cleanest alternative fuel.

True

The most widely used gasoline oxygenate additive is ethanol (ethyl alcohol).

True

Name the two types of threaded fuel line fittings.

Two types are squeeze to release and rotate to release.

A no start/no fuel pressure condition is being diagnosed. When a test light is connected to the pump positive terminal, there is no voltage when the engine is cranked by the starter. What could cause this problem?

defective fuel pump relay

EMI can be produced by the vehicle's primary ignition circuit.

false

Noise symptoms of overly advanced timing include ____________________ or engine knock.

pinging