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Note
When the pressure tester - VAS 6550- is to be removed, open the
shut-off tap “C” and release remaining pressure. To do this, hold
the hose of the shut-off tap “C” in a measuring container.
3.2 Checking holding pressure
Check condition
• The pressure tester - VAS 6550- has been connected
⇒ page 196 .
• Fuel pressure: approx. 5.0 bar
Test sequence
– Observe pressure drop on pressure gauge. After 10 minutes,
pressure must not drop below 4.3 bar.
If pressure drops below 4.3 bar:
– Switch on ignition.
– Press one after the other in the display the buttons for Vehicle
self-diagnosis , Engine electronics and Final con-
trol diagnosis .
– Press right arrow button ► on display to Final control di-
agnosis for fuel pump electronics .
The fuel pump must now run slowly up to maximum speed.
– Read pressure shown by pressure tester - VAS 6550- .
• Specification: 5.0 … 7.0 bar
– Switch off ignition and immediately close shut-off tap “B” of
pressure tester. The shut-off tap “B” is then at right angles to
direction of flow.
– Observe pressure drop on pressure gauge. After 10 minutes,
pressure must not drop below 4.3 bar.
If the pressure does not drop now (leak on engine side):
Leak must be sought on engine side; proceed as follows
⇒ page 201 .
If the pressure drops again (leak on fuel tank side):
Leak must be sought on fuel tank side; proceed as follows:
– Check connections at fuel tank for leaks .
If no fault is found:
– Check fuel line to sender flange ⇒ Item 14 (page 178) for leaks.
– Check all other fuel lines in fuel tank for leaks.
If no fault is found on the fuel line:
– Renew fuel delivery unit ⇒ page 188 .
Touareg 2010 ➤ , Touareg 2015 ➤
6-cylinder direct-injection engine (3.6 l engine, 4V) - Edition 12.2019
200 Rep. gr.20 - Fuel supply system
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