Volkswagen Golf / Golf GTI / Golf Variant. Manual — part 723
❑ If the connection was loosened, it must be replaced.
12 - Fuel Supply Line
13 - Spring Clamp
❑ Replace after removing
7.2
High Pressure Pump, Removing and In‐
stalling
Special tools and workshop equipment required
♦ Flare Nut Attachment - 17mm - T10456-
Caution
This procedure contains mandatory replaceable parts. Refer
to component overview prior to starting procedure.
Mandatory Replacement Parts
♦ Bolts - High Pressure Pump
Note
♦
Only remove the high pressure pump when the engine is cold.
♦
Pay attention when installing the high pressure pump, that no
dirt enters the fuel system.
♦
Collect escaping fuel with a rag.
♦
Inspect the O-ring for the high pressure pump, and replace it
if damaged.
♦
If the connection for the high pressure line -item 11-
was loosened, it must be replaced.
♦
Lubricate the high pressure line with engine oil and always
fasten them free of tension.
♦
Vehicles with the engine codes CNTA do not have an intake
manifold-fuel injector.
CAUTION
Fuel system is under high pressure.
Risk of injury from fuel spraying out.
– Reducing the fuel high pressure.
Removing
– Remove the engine cover. Refer to
⇒ “3.1 Engine Cover, Removing and Installing”, page 38
– Remove the air filter housing -3-. Refer to
– Free up the wiring harness -1 and 2- from the air guide pipe.
– Loosen the screw-type clamp -3-.
– Remove the bolts -arrows-.
– Loosen the hose clamp -arrow- and remove the left charge air
hose -1- with the air guide pipe downward.
– Release the retainers -arrow-, remove the wiring duct upward
from the bracket and move it towards the front.
– Remove the bolts -1, 2 and 3-.
– Remove the pipe clamp -arrow-.
– Loosen the union nut on the fuel rail -arrow- with the Flare Nut
Attachment - 17mm - T10456- .
– Counterhold on the hex fitting -A- and loosen the union nut
-arrow-. Remove the high pressure line.
– Disconnect the connector -1- from the Fuel Pressure Regula‐
tor Valve - N276- .
Vehicles with Intake-Manifold Fuel Injection
– Remove the fuel hose -3-.
For All Vehicles
– Remove the fuel hose -2-.
– Remove the bolts -arrows-.
– Carefully remove the high pressure pump. The roller tappet
can possibly remain in the vacuum pump.
Installing
– Replace the high pressure pump O-ring if damaged.
– Inspect the roller tappet for damages before installing and re‐
place if necessary.
– Insert the roller tappet into the vacuum pump as shown.
Note
♦
To insert the high pressure pump, the roller tappet must be at
its lowest point.
♦
If the connection for the high pressure line -item 11-
was loosened, it must be replaced.
– Rotate the crankshaft until the roller tappet is at the lowest
point.
– Insert the high pressure pump in the vacuum pump.
– Tighten the bolts -arrows- by hand in a diagonal sequence.
– Tighten the bolts diagonally to the tightening specification. For
the tightening specifications. Refer to
⇒ “7.1 Overview - High Pressure Pump”, page 325
– Attach the fuel hoses -2 and 3- if equipped and secure with the
spring clamp.
– Connect the connector -1- to the Fuel Pressure Regulator
Valve - N276- .
– Coat the high pressure line ball with engine oil and install the
high pressure line. Tighten the union nut hand-tight and align
the high pressure line free of tension.
– Tighten the union nut on the fuel rail -arrow- with the Flare Nut
Attachment - 17mm - T10456- .
– Counterhold on the hex fitting -A- and tighten the union nut
-arrow-.
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