VW Fuel Systems & Injection Technology

Question 1

What injection system does Volkswagen use in its TDI diesel engines to achieve high injection pressures?

Accepted Answer

Common rail direct injection

Answer

Throttle-body injection

Answer

Port fuel injection

Answer

Indirect pre-chamber injection

Question 2

What does the acronym 'TSI' stand for in Volkswagen engine nomenclature?

Accepted Answer

Turbocharged Stratified Injection

Answer

Turbocharged Sequential Injection

Answer

Twin-Supercharged Injection

Answer

Turbo direct injection with Stratified Injection

Question 3

In a VW FSI (Fuel Stratified Injection) engine, where is fuel injected?

Accepted Answer

Directly into the combustion chamber

Answer

Into the intake manifold upstream of the intake valve

Answer

Into the throttle body

Answer

Into the pre-chamber

Question 4

What is the typical high-pressure fuel rail operating pressure in a VW TDI common rail system?

Accepted Answer

1,600–2,000 bar

Answer

300–500 bar

Answer

800–1,000 bar

Answer

50–100 bar

Question 5

Which component in a VW TDI engine is driven by the camshaft to generate high-pressure fuel for the common rail?

Accepted Answer

High-pressure fuel pump (HPFP)

Answer

Electric lift pump

Answer

Fuel pressure regulator

Answer

Fuel metering valve

Question 6

In a VW TSI engine, what is the purpose of the low-pressure fuel pump located in the fuel tank?

Accepted Answer

To supply fuel to the high-pressure fuel pump at low pressure

Answer

To inject fuel directly into the combustion chamber

Answer

To regulate fuel temperature

Answer

To recirculate fuel vapors to the intake

Question 7

What VW system prevents fuel vapor from the tank from escaping into the atmosphere?

Accepted Answer

Evaporative emission control (EVAP) system

Answer

Exhaust gas recirculation (EGR)

Answer

Positive crankcase ventilation (PCV)

Answer

Secondary air injection system