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Table of Contents > Descriptions of work > Diesel fuel filter: renewing

VW Passat B8 Service Manual ➜ Diesel fuel filter: renewing

Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤  
Maintenance - Edition 11.2020  
Note  
If the currently used coolant additive cannot be determined  
precisely, use the scale -2- for coolant additive G13.  
Please observe disposal instructions!  
– Check coolant additive concentration after road test again.  
4.30.3  
Mixing ratio  
NOTICE  
Only distilled water may be used for mixing coolant additives.  
The use of distilled water ensures optimum protection against  
corrosion.  
Anti-freeze protection to  
Coolant additive  
portion  
Distilled water  
-25°C  
-36°C  
approx. 40%  
approx. 50%  
approx. 60%  
approx. 50%  
4.31  
Diesel fuel filter: renewing  
CAUTION  
Risk of burns from very hot fuel.  
♦ In extreme cases the fuel lines and the fuel can reach a  
temperature of 100°C. Allow the fuel to cool down before  
disconnecting the lines - risk of scalding.  
♦ Wear protective gloves.  
♦ Wear safety goggles.  
Risk of injury due to highly-pressurised fuel.  
♦ To release pressure in fuel system, place clean cloth  
around connection and carefully undo connection.  
Special tools and workshop equipment required  
♦ Safety gloves  
♦ Safety goggles  
Note  
Observe relevant disposal regulations.  
Removing  
NOTICE  
♦ Ensure that no diesel fuel contacts other components in  
the engine compartment. Clean immediately, if necessary.  
– Switch off ignition.  
4. Descriptions of work  
97  
Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤  
Maintenance - Edition 11.2020  
Note  
Before opening the system, place a cloth around the filter hous‐  
ing.  
– Unscrew bolts -arrows- in sequence shown -1- to -5-.  
– Collect any escaping fuel.  
– Remove upper section of fuel filter -1- from fuel filter housing  
-2-.  
– Place upper part of fuel filter -1- to one side (with fuel lines  
connected).  
– Remove filter element -1- from fuel filter housing -2-.  
Installing  
– Always moisten new seal slightly with diesel fuel to avoid  
malfunctions!  
– Insert filter element -2- centrally into fuel filter housing -1-.  
98  
4. Descriptions of work  
Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤  
Maintenance - Edition 11.2020  
Continue installation in reverse order of removal.  
Specified torque  
Nm  
5
Bolts for filter housing  
NOTICE  
The high-pressure pump has very close tolerances and must  
not be allowed to run without fuel. To prevent this and to ena‐  
ble the engine to start quickly after parts have been renewed,  
it is important to observe the following:  
♦ If components of the fuel system between the fuel tank and  
the high-pressure pump have been removed or renewed,  
the fuel system must be filled and bled before the engine is  
started for the first time.  
Bleeding fuel system  
There must be sufficient fuel in the tank.  
– Activate fuel pump ⇒ page 30 .  
– After the fuel system has been bled, start engine.  
– Allow engine to run for several minutes at mid revs, then  
switch engine off again.  
– Read event memory and erase if necessary.  
– Carry out a leakage test of the fuel system.  
Note  
If there is still air in the fuel system, the engine can change to  
emergency running mode during road test. In this case, switch  
the engine off and erase the fault memory. Then continue with a  
road test.  
4.32  
Air filter: cleaning housing and renew‐  
ing filter element  
Air filter element: removing and installing, 1.4 l TSI engines ⇒  
page 100  
Air filter element: removing and installing, 1.5 l TSI engines ⇒  
page 103  
Air filter element: removing and installing, 1.8 l TSI and 2.0 TSI  
engines ⇒ page 103  
Removing and installing air filter element, common rail engines,  
version 1 ⇒ page 104  
Air filter element: removing and installing, common rail engines,  
version 2 ⇒ page 106  
Air filter element, common rail engine, engine code CUAA: re‐  
moving and installing ⇒ page 107  
Special tools and workshop equipment required  
4. Descriptions of work  
99  

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