Volkswagen Phaeton 2003, Workshop Manual, Page: 151 / 190

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– Connect multimeter - V.A.G 1715- pick-up clamp to wire for
contact -1- -arrow- of 4-pin connector of wiring harness to right
fuel delivery unit.
– Start engine and run at idling speed.
– Measure current draw of fuel pump. Specification: max. 11
amps.
– Repeat test on left fuel delivery unit.
Note
The left fuel pump will be switched off at idle a few seconds after
the engine has been started.
If current draw is exceeded:
– Right fuel pump is defective. Renew fuel delivery unit
⇒ page 131 .
– Left fuel pump defective; renew fuel delivery unit
⇒ page 134 .
Note
If the fuel system malfunction is intermittent, you can perform the
check during a road test, but a 2nd person is necessary.
1.11.5 Checking fuel pump non-return valves
Test prerequisites
• Remote control - V.A.G 1348/3A- is still connected.
• The pressure tester - V.A.G 1318- is still connected.
Test procedure
Note
At the same time, this test checks for leaks in the fuel supply line
connections from the fuel delivery unit to the point at which the
pressure tester - V.A.G 1318- is connected.
Phaeton 2003 ➤
6-cylinder injection engine - Edition 02.2014
1. Parts of fuel supply system
145