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Home >> Volkswagen >> 2006 >> GTI 1.8 E, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 27 (2.0L - Fuel Supply - Engine Code(S): BPY (As Of 05.2006)) >> 20 Fuel Supply >> Fuel Supply Servicing >> Residual Pressure, Checking

Residual Pressure, Checking

WARNING: This page is about a different variant/trim than selected.

Special tools and workshop equipment required 

Test requirements 

WARNING:

Fuel supply line is under pressure! Wear protective goggles and protective clothing to prevent injuries and contact with skin. Before loosening hose connections, place rags around the connection point. Then release pressure by carefully pulling on hose.

Procedure 

-- Disconnect the fuel supply line -2- and catch leaking fuel using a rag.

Fig 1: Identifying Fuel Supply Line
GWWA10-1623Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Install a High pressure fuel gauge in place of the fuel supply line.

Fig 2: Identifying V.A.G. 1318
GWWN20-10122Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Open the shut-off valve of the High pressure fuel gauge.

-- Switch the ignition on and off until the fuel pressure no longer increases.

-- Check the indicated fuel pressure on the High pressure fuel gauge.

Specified value: 3.5 to 5.0 bar.

-- Observe the pressure drop on the pressure gauge. Pressure must not fall below 3.0 bar within 10 minutes.

If pressure drops further:

-- Switch the ignition on and off until the fuel pressure on no longer rises.

-- Immediately close the shut-off valve of High pressure fuel gauge.

Fig 3: Identifying V.A.G. 1318
GWWN20-10122Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

If the fuel pressure falls again:

-- Check the fuel line to the high pressure pump for proper seal.

If no malfunction can be found:

-- Replace the high pressure pump. Refer to RESIDUAL PRESSURE, CHECKING .

If the fuel pressure no longer falls:

-- Check the fuel line to the fuel filter for proper seal.

If no malfunctions are found on the fuel line:

-- Check the fuel pump check-valve.

-- Connect a High pressure fuel gauge between the fuel filter and fuel supply line.

Fig 4: Identifying High Pressure Fuel Gauge Connected Between Fuel Filter And Fuel Supply Line
GWWN20-10148Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Open the shut-off valve of the pressure gauge.

-- Switch the ignition on and off until the fuel pressure no longer increases.

-- Check the indicated fuel pressure on the High pressure fuel gauge.

Specified value: 3.5 to 5.0 bar.

-- Observe the pressure drop on the pressure gauge. Pressure must not fall below 3.0 bar within 10 minutes.

If pressure drops further:

-- Immediately close the shut-off valve of High pressure fuel gauge.

Fig 5: Identifying Closed Shut-Off Valve Of Pressure Measuring Device
GWWN20-10139Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Observe the fuel pressure drop on the pressure gauge.

The fuel pressure must not fall below 3.0 bar within 10 minutes.

If the fuel pressure falls:

-- The check-valve in the fuel pump is faulty, replace fuel pump. Refer to FUEL DELIVERY UNIT .

If pressure does not fall:

-- The pressure relief valve in the fuel filter malfunctioning. Refer to FUEL SYSTEM COMPONENTS .

Final procedures 

After the repair work, the following work steps must be performed in the following sequence:

  1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
  2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
  3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .
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