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– Compare quantity of fuel delivered with specification.
7) Delivery rate cm3/30 seconds
8) Voltage at fuel pumps with engine not running and pump running (approx. 2
volts less than battery voltage).
Example:
During the test a voltage of 13.0 volts is measured at the battery.
As the voltage at the pumps is approx. 2 volts less than the battery
voltage, this will equate to a minimum delivery rate of 1,200
cm
3
/30 s.
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
⇒ page 144
.
If the minimum delivery rate is not attained:
– Check fuel lines for possible restrictions (kinks) or blockages.
– Pull supply line -1- off inlet to fuel filter.
Note
Press buttons on hose couplings to do this.
– Connect pressure gauge - V.A.G 1318- with adapter set -
V.A.G 1318/17- to hose.
– Repeat delivery rate check.
If the minimum delivery rate is now attained:
– Renew fuel filter.
If the minimum delivery rate is still not reached:
⇒ page 143
1.11.2
Checking delivery quantity of right pump
– Disable activation of left pump:
– To do this, pull connector -2- for remote control out of relay
socket for left pump.
– Empty measuring container.
– Operate remote control for 30 seconds while measuring bat‐
tery voltage.
Phaeton 2003 ➤
6-cylinder injection engine - Edition 02.2014
1. Parts of fuel supply system
143
