Get Mixture preparation - injection -> 2.2 Checking fuel pressure regulator and holding pressure Guide for Volkswagen Touareg SUV First Generation (2002-2010)

Touareg 2003 ➤

8-cylinder injection engine - Edition 11.2011

– Connect crocodile clip of remote control -V.A.G 1348/3- to

battery positive (+) -1- in engine compartment.

– Switch on ignition.

– Operate remote control -V.A.G 1348/3- for 30 seconds.

– Repeat check on other injectors. Use new measuring beakers.

– Switch off ignition.

– After all injectors have been activated, place measuring beak‐

ers on a level surface and compare the quantity injected.

Specification: 95..0.115 ml per injector

If the measured values of one or more injectors are above or be‐

low the prescribed specifications:

– Renew defective injector.

Install injectors in reverse order. In the process, note the follow‐

ing:

♦ Renew O-rings on all injectors and lightly moisten with clean

engine oil.

♦ Insert injectors vertically and in the correct position into the fuel

rail and secure with retaining clips.

♦ Fit fuel rail with secured injectors onto intake manifold and

press in evenly.

2.2

Checking fuel pressure regulator and

holding pressure

Special tools and workshop equipment required

♦ Pressure gauge -V.A.G 1318-

♦ Adapter set -V.A.G 1318/7-

♦ Adapter set -V.A.G 1318/10-

♦ Adapter set -V.A.G 1318/13-

♦ Spring-type clip pliers -VAS 6340-

142

Rep. gr.24 - Mixture preparation - injection

Touareg 2003 ➤

8-cylinder injection engine - Edition 11.2011

Test procedure

The fuel pressure regulator maintains the fuel pressure at a con‐

stant 4.0 bar.

•

Fuel pump delivery is OK.

WARNING

Fuel supply lines are under pressure! Wear eye protection and

gloves to avoid injuries and skin contact. Before loosening

hose connections, wrap a cloth around the connection. Then

release pressure by carefully pulling hose off connection.

– Wrap a cloth around the threaded connection -arrow- and re‐

lease fuel pressure by quickly opening and closing connection.

– Loosen spring-type clip and disconnect fuel hose from con‐

nection on fuel rail ⇒ Item 14 (page 133) .

– Now connect pressure tester -V.A.G 1318- using adapters -

V.A.G 1318/7- , -V.A.G 1318/10- and -V.A.G 1318/13- as

shown in the illustration.

– The lever on pressure tester -V.A.G 1318- -1- points in direc‐

tion of flow.

– Always secure both hose ends with clips -2-.

– Start engine and run at idling speed.

– Measure fuel pressure. Specification: approx. 4.0 bar.

If the specification is not attained:

– Check delivery rate of fuel pumps ⇒ page 107 .

– Renew fuel pressure regulator -2-, if necessary.

If specification is attained:

– Switch off ignition.

– Now check for leaks and holding pressure. Do this by observ‐

ing pressure drop on gauge. After 10 minutes, there must be

a residual pressure of at least 3.0 bar.

If the holding pressure drops below 3 bar:

– Check pressure tester for leaks.

– Check non-return valves of left and right fuel pumps

⇒ page 111 and ⇒ page 113 .

– Switch off ignition.

When the pressure tester is removed after the test has been

completed:

2. Checking components

143

Touareg 2003 ➤

8-cylinder injection engine - Edition 11.2011

– Wrap a cloth around the threaded connection -arrow- and re‐

lease fuel pressure by quickly opening and closing connection.

– Remove pressure tester -V.A.G 1318- with adapters.

– Reconnect fuel hose to fuel rail and secure with spring-type

clip ⇒ Item 14 (page 133) .

144

Rep. gr.24 - Mixture preparation - injection

Mixture preparation - injection -> 2.2 Checking fuel pressure regulator and holding pressure for Your Volkswagen Touareg SUV First Generation (2002-2010)

Related Topics

Mixture preparation - injection

Popular Owner Manuals

Latest Owner Manuals