Corrado, GTI & Passat

Remove fuel pump relay from relay panel. On Corrado and Passat, activate fuel pumps using Remote Control (VAG 1348/3A). On GTI, activate fuel pumps using Remote Control (US 4480/3). On all models, measure voltage being applied to fuel pump when activating with remote control. Record voltage.
Fuel volume is relative to voltage applied to fuel pumps. Activate fuel pumps for 30 seconds. Compare volume with values in the FUEL PUMP PERFORMANCE table.

FUEL PUMP PERFORMANCE

Application

psi (kg/cm(² )

Min. Vol. In 30 Sec: Pts. (L)

Cabriolet

43 (3.0)

1.4 (0.7)

Corrado SLC ⁽¹⁾

58 (4.0)

1.0-1.4 (0.5-0.7)

EuroVan ⁽¹⁾

43 (3.0)

1.0-1.4 (0.5-0.7)

Fox ⁽²⁾

36 (2.5)

1.4 (0.7)

Passat GL

⁽³⁾ 87-94 (6.1-6.6)

1.0-1.4 (0.5-0.7)

Passat GLX ⁽¹⁾

58 (4.0)

1.0-1.4 (0.5-0.7)

⁽¹⁾	Using Adapter Cable (VAG 1348/3-2) between battery positive terminal and terminal No. 4 of fuel pump relay socket. Fuel pump energized, with 10-12 volts at fuel pump and engine off.

⁽²⁾	Using Remote Control Switch (US 4480/3) in place of fuel pump relay.

⁽³⁾	Briefly operate starter and ensure fuel pump runs for at least one second. Alternate method is to disconnect Electronic Control Module (ECM) and ground terminal No. 12 using Remote Control Switch (VAG 1348/3A).

REGULATED FUEL PRESSURE

Application/ Model

At Idle w/Vacuum psi (kg/cm² )

At Idle w/o Vacuum ⁽¹⁾ psi (kg/cm² )

Cabriolet & Fox

36 (2.5)

43 (3.0)

Corrado SLC

50 (3.5)

58 (4.0)

EuroVan

36 (2.5)

43 (3.0)

Passat GL

⁽²⁾ 87-94 (6.1-6.6)

⁽³⁾ 87-94 (6.1-6.6)

Passat GLX

50 (3.5)

58 (4.0)

⁽¹⁾	With vacuum hose disconnected from fuel pressure regulator.

⁽²⁾	Approximately 4.3-7.2 psi (0.3-0.5 kg/cm² ) below system pressure, with differential pressure regulator disconnected.

⁽³⁾	Approximately 18.5-23.0 psi (1.3-1.6 kg/cm² ) below system pressure, with differential pressure regulator connected.