Checking fuel system pressurisation pump G6/fuel pump G23, vehicles with 3.0 ltr. (V6) or 4.2 ltr. (V8) engine up to 05.2010 — AUDI

Checking
fuel system pressurisation pump
G6
/
fuel pump
G23
, vehicles with 3.0 ltr. (V6) or 4.2 ltr. (V8) engine up to 05.2010
Special tools and workshop equipment required
Remote control
V.A.G 1348/3A
for V.A.G 1348 with adapter cable
V.A.G 1348/3-3
Fuel-resistant measuring container
Procedure
Observe test conditions
Chapter
.
Observe rules for cleanliness
Chapter
.
Remove filler cap from fuel filler neck.
Open plenum chamber cover
item 1
on left above electronics box.
Turn quick-release fasteners
1, 3, 4
90° anti-clockwise
arrows
.
Remove cover
2
for relay and fuse holder.
Pull fuses for the two fuel pumps out of relay and fuse holder in electronics box in plenum chamber (left-side)
Current flow diagrams, Electrical fault finding and Fitting locations
.
Connect
remote control
V.A.G 1348/3A
to left terminals
arrow 1
and
arrow 2
of sockets of the two fuses for the fuel pumps with adapter cable
V.A.G 1348/3-3
Current flow diagrams, Electrical fault finding and Fitting locations
.
Note
Vehicles from 09.2008 onwards with engine code CCMA, CATA; vehicles from 06.2009 onwards with engine code CCFA
Connect
remote control
V.A.G 1348/3A
to left terminal
arrow 1
of socket of fuse for fuel pump with adapter cable
V.A.G 1348/3-3
Current flow diagrams, Electrical fault finding and Fitting locations
.
Tape off 2nd connector contact
arrow 2
of adapter cable
V.A.G 1348/3-3
with insulating tape to prevent short circuits.
Note
Lay a clean cloth under the separating point to catch escaping fuel.
WARNING
The fuel can become extremely hot. This can cause injuries.
In extreme cases the fuel lines and the fuel can reach a temperature of 100 °C on vehicles with common rail engine, even after the engine is switched off. Allow the fuel to cool down before disconnecting the lines - danger of scalding.
Wear protective gloves.
Wear safety goggles.
Risk of injury - fuel system operates under high pressure.
To reduce the pressure in the fuel system, wrap a clean cloth around the connection and carefully loosen the connection.
Caution
Observe rules for cleanliness when working on the injection system
Chapter
.
Disconnect fuel supply hose
1
from fuel filter.
Note
Ignore other items.
Hold end of detached fuel supply hose
arrow
into measuring container.
Note
If necessary, lengthen fuel supply hose with an auxiliary hose.
Press remote control button for 15 seconds.
Compare amount of fuel delivered with minimum delivery shown in diagram (cm
3
/15 sec.).
Note
Voltage at fuel pump with engine stationary and pump running is approx. 2 volts less than battery voltage.
If minimum delivery rate is not reached, check for the following causes:
There is not enough fuel in fuel tank.
Fuel lines have been crushed.
One of the two fuel pumps is defective.
Note
With this test the fuel filter is not checked for any obstructions. If necessary, check the filter separately.