Volkswagen Touareg (2003 year). Manual — part 28
Checking delivery quantity of right pump
– Connect remote control -V.A.G 1348/3 A- with adapter cable
- Phaeton -V.A.G 1348/3-3- to connection -arrow- of fuel pump
relay for right fuel delivery unit.
– Connect positive terminal of remote control to positive pole in
engine compartment.
– Disconnect fuel supply hose -1- from fuel rail.
– Hold hose in measuring container -2- with minimum capacity
of 1000 cm
3
.
– Empty measuring container before making measurement.
– Operate remote control for 15 seconds. At least 800 cm
3
fuel
per 15 seconds must be delivered.
1.11.2
Checking delivery quantity of left pump
– Connect remote control -V.A.G 1348/3 A- with adapter cable
- Phaeton -V.A.G 1348/3-3- to connection -arrow- of fuel pump
relay for left fuel delivery unit.
– Empty measuring container before making measurement.
– Operate remote control 15 seconds again. At least 800 cm
3
fuel per 15 seconds must be delivered.
– In addition, check both fuel delivery units.
– To do so, connect adapter cable - Phaeton -V.A.G 1348/3-3-
to connections of relays for left and right fuel delivery units.
– Empty measuring container before making measurement.
– Operate remote control 10 seconds. At least 800 cm
3
fuel per
10 seconds must be delivered.
If the minimum delivery rate is not attained during one of the tests:
– Check fuel lines for possible restrictions (kinks) or blockages.
If fuel lines are ok:
– Renew fuel filter.
If delivery rate has been attained, but nevertheless you suspect
a fuel supply system fault (e.g. intermittent failure of fuel supply
system):
– Check current draw of fuel pumps
.
1.11.3
Checking current draw of pumps
– Check current draw of each fuel pump separately as follows:
– Reconnect all disconnected fuel lines.
Touareg 2003 ➤
1. Parts of fuel supply system
109
-arrows-.
– Remove nuts -1- from cover. If necessary, unscrew backrest
mounting -2- or support mounting ⇒ General body repairs,
interior; Rep. gr. 72 ; Rear seats .
Touareg 2003 ➤
110
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
– 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.
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.
Touareg 2003 ➤
1. Parts of fuel supply system
111
-T10202- .
– Carefully lever flange and raise it slightly.
– Disconnect connectors next to fuel filter.
– Then detach fuel supply hose -2- leading from right fuel deliv‐
ery unit from fuel filter -1-.
– Allow fuel from connection -1- to flow back into fuel tank.
– Close pressure gauge shut-off tap (lever at right angles to di‐
rection of flow).
– Connect pressure tester -V.A.G 1318- with adapter -
V.A.G 1318/7- , adapter -V.A.G 1318/13- and adapter -
V.A.G 1318/17- as shown.
Note
Ensure that fuel supply line connection engages audibly when
joined.
Touareg 2003 ➤
112
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