2003-2021 Volkswagen Fox SUV Supplysystem-tank,Fuelpump(pre-supplypump)G6 -> 1.8 Fuel pump (pre-supply pump) G6 - check User Manual
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Supplysystem-tank,Fuelpump(pre-supplypump)G6 -> 1.8 Fuel pump (pre-supply pump) G6 - check for Your Volkswagen Fox SUV Second Generation (2003-2021)

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FOX 2004 ➤  
3 - Cyl. injection engine - Edition 12.2009  
1.8  
Fuel pump (pre-supply pump) -G6- - check  
Special tools and workshop  
equipment required  
♦ Spanner -VW 5321/9- or  
Spanner -T10334-  
♦ Pressure gauge -VAG  
1318-  
♦ Adapter -VAG 1318/13-  
♦ Adapter -VAG 1318/11-  
♦ Adapter -VAG 1318/17-  
♦ Torque wrench - 40 to 200  
Nm (enc. 1/2") -VAG 1332-  
1. Fuel supply system components - remove and install  
71  
FOX 2004 ➤  
3 - Cyl. injection engine - Edition 12.2009  
Special tools and workshop  
equipment required  
♦ Adapting cable -VAG  
1348/3-2-  
♦ Test probe -EQ 7300- or  
Test probe -VAG 1527B-  
♦ Auxiliary measuring set -  
VAG 1594A -  
♦ Multimeter -VAG 1715-  
♦ -Recipiente graduado-  
♦ ⇒ Current flow diagrams,  
Electrical fault finding and  
Fitting locations  
1.8.1  
Check conditions  
•
•
•
Fuse number 33 ok.  
Battery -A- voltage must be at least 11.5 V.  
All power consuming components, like lights and rear window  
demister, must be off.  
•
If the vehicle is equipped with air conditioning, turn it off.  
Note  
Observe the description of how fuel is shut off in case of accident  
⇒ page 70 .  
72  
Rep. Gr.20 - Supply system - tank, Fuel pump (pre-supply pump) G6  
FOX 2004 ➤  
3 - Cyl. injection engine - Edition 12.2009  
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1.8.2  
Operation of power supply - check  
Note  
In the following operation sequence, it might be necessary to dis‐  
connect the Battery -A- earth strap. Therefore, check whether a  
code radio is fitted. If this is case, obtain the anti-theft code first.  
– Fold rear seat forwards.  
– Remove the cover beneath the seat.  
– Turn the ignition on. The Fuel pump (pre-supply pump) -G6-  
has to work audibly for approx. 1 second.  
If the Fuel pump (pre-supply pump) -G6- does not work:  
– Turn the ignition off.  
– Remove fuse holder cover.  
– Remove fuse 33 from the ( Fuel pump (pre-supply pump) -  
G6- ) fuse holder.  
– Connect the Remote control -VAG 1348/3A- and Adapter ca‐  
ble -VAG 1348/3-2- to the lower contact of fuse 33 for activat‐  
ing the Fuel pump (pre-supply pump) -G6- and to the positive  
terminal of Battery -A- (+).  
– Activate the Remote control -VAG 1348/3A- .  
If the Fuel pump (pre-supply pump) -G6- works:  
– Check operation of Fuel pump relay -J17- , according to ⇒ Cur‐  
rent flow diagrams, Electrical fault finding and Fitting locations.  
If the Fuel pump (pre-supply pump) -G6- does not work:  
– Disengage the 4-pole connector for the Fuel pump (pre-supply  
pump) -G6-  
– Connect the Test probe -EQ 7300- or Test probe -VAG 1527B-  
with Auxiliary cables -VAG 1594A- with Auxiliary cables to the  
connector external contacts.  
– Activate the Remote control -VAG 1348/3A- .  
The LED should light up.  
– If LED does not light up:  
– Locate and eliminate cable interruption, according to⇒ Current  
flow diagrams, Electrical fault finding and Fitting locations.  
The LED lights up (correct power supply):  
– Remove the Fuel pump (pre-supply pump) -G6- with the Span‐  
ner -VW 5321/9- or Spanner -T10334- .  
– Check that the cables are connected to the Fuel pump -G23- .  
In case there is no cable interruption:  
– Fuel pump (pre-supply pump) -G6- - damaged, replace.  
1. Fuel supply system components - remove and install  
73  
FOX 2004 ➤  
3 - Cyl. injection engine - Edition 12.2009  
1.8.3  
1.8.4  
Fuel flow - check  
Test conditions  
•
•
•
Fuel pump (pre-supply pump) -G6- supply is ok.  
Remote control -VAG 1348/3A- installed.  
Fuel pump (pre-supply pump) -G6- pressure and fuel pressure  
adjuster OK: ⇒ page 98  
1.8.5  
Test sequence  
Note  
Fuel flow is measured at 3.0 bar for vehicles manufactured until  
lk  
May/2006, and 4.0 bar for vehicles produced as of June/2006.  
Thereby, fuel pressure must be checked before measuring the  
flow.  
– Remove the fuel reservoir lid.  
WARNING  
Fuel supply pipes are under pressure. Before loosening hose  
connection, place a cloth around them. Next, eliminate pres‐  
sure by removing hose carefully.  
– Disconnect fuel hose coupling-1- and clean the spilled fuel  
with a cloth.  
– Couple the Pressure gauge -VAG 1318 - to the fuel supply  
tube, by using the adapters Connector -VAG 1318/23- and  
Adapter -VAG 1318/17- .  
– Connect the Pressure gauge -VAG 1318- hose to the Adapter  
-VAG 1318/11- and Adapter -VAG 1318/1- on the checking  
Pressure gauge -VAG 1318- and place its end inside a grad‐  
uated container with at least 3.0-liter capacity.  
– Open the Pressure gauge -VAG 1318- valve. It will indicate  
the flow direction-A-.  
– Activate the Remote control -VAG 1348A- , closing the cock  
slowly, until the Pressure gauge -VAG 1318- indicates a pos‐  
itive pressure of 3.0 bar for vehicles manufactured until May/  
2006, and 4.0 bar for those produced as of June/2006. Then,  
do not change cock position.  
– Empty measuring container.  
– The Fuel pump (pre-supply pump) -G6- flow depends on the  
Battery voltage -A- . Because of that, couple the Multimeter -  
VAG 1715- to the vehicle Battery -A- , by using the Auxiliary  
cables -VAG 1594A- .  
– Activate the Remote control -VAG 1348A- for 30 seconds,  
measuring the Battery -A- voltage.  
74  
Rep. Gr.20 - Supply system - tank, Fuel pump (pre-supply pump) G6  
FOX 2004 ➤  
3 - Cyl. injection engine - Edition 12.2009  
– Compare fuel flow with theoretical value for vehicles manu‐  
factured until May/2006 ( Fuel pump (pre-supply pump) -G6-  
pressure of 3 bar).  
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– Compare fuel flow with theoretical value for vehicles manu‐  
factured as of June/2006 ( Fuel pump (pre-supply pump) -G6-  
pressure of 4 bar).  
3
6) Minimum amount cm /30 s  
7) Voltage in the Fuel pump (pre-supply pump) -G6- with engine stopped and  
Fuel pump (pre-supply pump) -G6- operating (approx. 2 volts less than Battery -  
A- voltage).  
Example of reading:  
During the test, a voltage of 12.5 volts is measured on the Battery  
-A- . As in the Fuel pump (pre-supply pump) -G6- there is a voltage  
of around 2 volts less than in the Battery -A- , the result is a min‐  
3
3
imum supply flow of 633 cm >/30 s for vehicles manufactured  
until May/2006 and 333 cm /30 s for vehicles produced as of  
June/2006.  
If minimum flow capacity is not reached:  
– Check if the supply pipes to the filter present folds or obstruc‐  
tions.  
If fuel pipes are ok.  
– Check fuel flow before fuel filter.  
WARNING  
Fuel supply pipes are under pressure! Before loosening hose  
connections, put a cleaning cloth on connection points. Then  
depressurize by carefully pulling the hose.  
Note  
For that, press the keys on hose connectors.  
1. Fuel supply system components - remove and install  
75  
FOX 2004 ➤  
3 - Cyl. injection engine - Edition 12.2009  
lk  
– Remove supply hose-1- from fuel filter inlet and connect it to  
Adapting set -VAG 1318/17- .  
– Pressure gauge -VAG 1318- with Adapting set -VAG 1318/17-  
as shown.  
– Install the adapter -V.A.G 1318/16- on the adapter -  
V.A.G 1318/11- for the Pressure gauge -VAG 1318- and put  
its end in a graduated container with at least 3.0-liter capacity.  
– Open the Pressure gauge -VAG 1318- valve. The cock points  
towards the fuel passage-A-.  
– Activate the Remote control -VAG 1348/3A- , closing the cock  
slowly, until the Pressure gauge -VAG 1318- indicates a pres‐  
sure of 3.0 bar for vehicles manufactured until May/2006, and  
4.0 bar for those produced as of June/2006. Do not change  
cock position.  
– Empty measuring container.  
– Check flow again.  
– Activate the Remote control -VAG 1348/3A - once more for 30  
seconds. Compare the flow value with the one obtained in the  
first measurement.  
If the minimum flow is reached:  
– Replace the fuel filter.  
If the minimum flow is not reached again:  
– Remove the Fuel pump (pre-supply pump) -G6- and check  
whether there is dirt in the screen filter.  
Only if no irregularities have been found so far:  
– Fuel pump (pre-supply pump) -G6- - damaged, replace it  
⇒ page 66 .  
If the desired fuel flow is reached, but at great cost, we may con‐  
clude that the fuel supply presents irregularities (i.e.: a momentary  
fault in the fuel supply):  
– Couple the removed fuel tubes again.  
– By using the current leakage clamp meter, couple the Multi‐  
meter -VAG 1715- to contact 1 (blue/white) 4-pole connection  
socket box cable -arrow- from cable harness.  
– Start engine and let it run in idle speed.  
– Measure current draw of the Fuel pump (pre-supply pump) -  
G6- .  
Theoretical value: 6.8 ampere at most for vehicles manufactured  
until May/2006 and 7.6 ampere for the ones produced as of June/  
2006.  
Note  
If it is a temporary fault in the fuel system, checking can also take  
place during a test drive, when the presence of a second person  
will be necessary.  
If the current draw is excessive:  
– Fuel pump (pre-supply pump) -G6- - damaged, replace it.  
76  
Rep. Gr.20 - Supply system - tank, Fuel pump (pre-supply pump) G6  
FOX 2004 ➤  
3 - Cyl. injection engine - Edition 12.2009  
1.8.6  
1.8.7  
Fuel pump (pre-supply pump) -G6-  
check valve - check  
Test conditions  
•
Remote control -VAG 1348/3A- and Adapting cable -VAG  
1348/3-2- connected.  
1.8.8  
Test sequence  
lk  
WARNING  
Fuel supply pipes are under pressure! Before loosening hose  
connections, put a cleaning cloth on connection points. Then  
depressurize by carefully pulling the hose.  
Note  
This test must check simultaneously the tightness of joints on the  
fuel supply tube sets, from the Fuel pump (pre-supply pump) -G6-  
to the joint on the Pressure gauge -VAG 1318- .  
– Remove supply hose -1- from fuel filter inlet and connect it to  
the Adapting set -VAG 1318/17- and the Pressure gauge -  
VAG 1318- .  
– Install the Adapter -VAG 1318/16- on the Pressure gauge -  
VAG 1318/11- Adapter and insert the hose -VAG 1318- end  
in a measuring container.  
Note  
For that, press the keys on hose connectors.  
– Close the valve on the Pressure gauge -VAG 1318- (trans‐  
verse valve in relation to the flow direction - position -B-).  
– Activate the Remote control -VAG 1348/3A- in quick consec‐  
utive intervals, until reaching a pressure of approx. 3.0 bar for  
vehicles manufactured until May/2006 and 4.0 bar for the ones  
produced as of June/2006.  
WARNING  
Risk of splashing when opening the cock; keep a container in  
front of the free end of the Pressure gauge -VAG 1318- .  
– Eliminate eventual excess pressure by opening the valve  
carefully.  
– Check pressure drop on the Pressure gauge -VAG 1318- . Af‐  
ter 10 minutes, the pressure must not drop below 2.0 bar.  
If the pressure keeps dropping:  
– Check the joints for tightness.  
If no irregularities are found in the pipes:  
– Fuel pump (pre-supply pump) -G6- - damaged, replace it.  
1. Fuel supply system components - remove and install  
77  

Related Topics

Supplysystem-tank,Fuelpump(pre-supplypump)G6
1 Fuel supply system components - remove and install 1.1 Fuel supply system components - remove and install 1.2 Safety measures in fuel supply works 1.3 Cleaning rules 1.4 Fuel pump (pre-supply pump) G6 - remove and install 1.5 Fuel level sensor G - remove and install 1.6 Fuel reservoir - remove and install 1.7 Fuel shut off in case of accident 1.9 Supply system - drain the air 2 Activated charcoal filter system 2.1 Operation 2.2 Activated charcoal filter system components - repair 2.3 Reservoir ventilation - check 3 Engine power electronic adjustment (electronic accelerator) 3.1 Operation 3.2 Engine power electronic adjustment (electronic accelerator)

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