Volkswagen Golf / Golf GTI / Jetta. Manual — part 214

24-110

Residual
pressure
and fuel
pressure
regulator,
checking

Special tools
and
equipment

VAG 1318

Pressure
gauge

VAG

1318/10
Adapter

VAG

1318/11
Adapter

VAG

1318/16
Hose
adapter

VAS 5024

Assembly
tool for
spring-
type clips

Components, checking

24-111

Function

The fuel pressure regulator regulates the

fuel pressure depending on intake manifold
pressure.

The specification for the check is dependent

upon the working pressure of the fuel pump.
This is approx. 3.0 bar

Test requirements

Fuel pump delivery rate OK., checking:

Repair Manual, 2.8 Liter VR6 4V Engine

Mechanical, Engine Code(s): BDF; Repair
Group 20

Components, checking

24-112

Test sequence

- Pull fuse No. 28 (for fuel pump)

out of fuse holder.

WARNING!

Fuel system is under pressure!
Before opening the system place
a cloth around the connection.
Then release pressure by
carefully loosening the
connection.

- Pull fuel supply hose -1- (black)

off fuel rail and collect fuel that
leaks out with a cloth.

Components, checking

24-113

- Connect pressure gauge VAG

1318 with adapter, VAG 1318/10
to supply hose -1- and with
adapter VAG 1318/11 and VAG
1318/16 hose adapter to supply
line.

- Open shut-off tap on pressure

gauge. Handle points in through-
flow direction (arrow).

- Install fuel pump fuse No. 28 into

fuse holder.

- Start engine and run at idle.

- Measure fuel pressure.

Specification: Approx. 2.5 bar

- Pull vacuum hose off fuel

pressure regulator (arrow).

Fuel pressure must increase to

approx. 3.0 bar.

- Switch off ignition.

Components, checking