Auxiliary Fuel Pump -V393- (IN-LINE ELECTRIC FUEL PUMP), CHECKING

WARNING: This page is about a different car, the 2010 Volkswagen Jetta and 2009 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Fuel Inj. Pressure Gauge-CIS V.A.G 1318

Test Conditions

Battery voltage at least 12.5 volts.
Fuel filter OK.
Fuel tank is at least 1/2 full
Ignition is turned off

-- Remove the engine cover. Refer to ENGINE COVER .

WARNING:

Follow the guidelines for a clean working environment when working on the fuel supply system. Refer to CLEAN WORKING CONDITIONS .
Always follow these rules before and during work.
Before opening the fuel system, lay a clean cloth around the connection point and carefully loosen it, which lowers the pressure.

-- Disconnect the fuel supply line -arrow- from the high pressure pump.

Fig 1: Identifying Fuel Supply Line -Arrow- To High Pressure Pump

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect the fuel inj. pressure gauge-CIS V.A.G 1318 and the hose -2- to the fuel supply line -1-. Connect the other hose -3- to the connection on the high pressure pump.

Fig 2: Identifying Fuel Supply Line -1- And Hoses -2- / -3-

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

NOTE:

The fuel inj. pressure gauge-CIS V.A.G 1318 is switched on in the fuel supply line.

Fig 3: Identifying Fuel Injection Pressure Gauge-CIS V.A.G 1318 Connected To Fuel Supply Line

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect the vehicle diagnostic tester and perform the guided function "Check Electric Fuel Pumps".

NOTE:

The fuel pump now runs for 30 seconds.

-- Let the fuel pumps run until the highest fuel pressure is reached.

Specified value: minimum 3.5 bar

If the specification is not obtained:

Check the connection between the fuel inj. pressure gauge-CIS V.A.G 1318 and fuel line for leaks.

Check the fuel inj. pressure gauge-CIS V.A.G 1318 for leaks.

Check the fuel lines and their connections for leaks.

Is the fuel filter clogged?

Check the delivery rate of the transfer fuel pump -G6-. Refer to FUEL DELIVERY, CHECKING .

NOTE:

Check the fuel system for leaks.