Touareg 2003 ➤
8-cylinder injection engine - Edition 11.2011
– Connect multimeter -V.A.G 1715- pick-up clamp to wiring of 4-
pin connector contact -1- -arrow- of wiring harness to right fuel
delivery unit.
Note
The hand-held multimeter -V.A.G 1526D- with pickup clamp -
V.A.G 1526B/2- can also be used.
– Start engine and run at idling speed.
– Measure current draw of fuel pump. Specification: max. 11
amps.
If current draw is exceeded:
– Right fuel pump is defective. Renew fuel delivery unit
⇒ page 102 .
– Repeat test on left fuel delivery unit.
If current draw is exceeded:
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.
– Left fuel pump is defective. Renew fuel delivery unit.
Note
If the fuel system malfunction is intermittent, you can perform the
check during a road test, but a 2nd person is necessary.
lk
1.12
Checking non-return valve of right pump
Test prerequisites
•
Fuel pump relays -1- for right fuel delivery unit and -2- for left
fuel delivery unit must be removed from their sockets.
1. Parts of fuel supply system
111
English 
