VW Golf manuals

Volkswagen Golf Service & Repair Manual: Bleeding fuel line to metering pump -V54- (filling with fuel)

Volkswagen Golf Service & Repair Manual / Auxiliary heater / Aux. heater/heater booster / Fuel supply system / Bleeding fuel line to metering pump -V54- (filling with fuel)

  Note
Air/fuel vapour in the fuel supply to the auxiliary heater can lead to malfunction when the auxiliary heater is in the sparking mode. To prevent air/fuel vapour from being drawn in by the metering pump -V54- and conveyed to the auxiliary heater when the auxiliary heater is first switched on after performing repairs on the fuel tank or the fuel delivery unit, the fuel take-off pipe must be filled with fuel (bled) after performing repairs in this area.
The fuel line must be bled, for example if the fuel line was removed and the entire fuel line is filled with air. For example, if only the fuel delivery unit was removed and there is only a small amount of air in the fuel line; it is sufficient to switch on the auxiliary heater and let it run for some time in full load mode (at least 10 minutes) to check its operation after completing work on the fuel system.
After completing work on the fuel system, switch on the auxiliary heater, and let it run for some time in full load mode (at least 10 minutes).
On vehicles with high-voltage system, it may not be possible to switch on the auxiliary heater via the control panel, depending on the charge level of the hybrid battery unit -AX1- and the ambient temperature. If the -J255- gets the information that the hybrid battery unit -AX1- is sufficiently charged, that there is sufficient power available to operate the high-voltage heater (PTC) -Z115- and that the ambient temperature is above -10°C, the -J255- activates the -Z115- (the auxiliary heater is not activated). In this case, the auxiliary heater can be switched on using e.g. the “Basic setting” function. For additional information refer to vehicle diagnostic tester in “Guided fault finding” mode.
  Note
   
On vehicles with high-voltage system, the metering pump -V54--1- cannot be accessed if the fuel tank is installed. Therefore, bleed fuel line -2- (and corresponding riser tube) leading to metering pump -V54- after completing work on the fuel system of the auxiliary heater (e.g. upon repair work on the fuel delivery unit or the -V54--1-).
–  Disconnect fuel line -4- leading from -V54--1- to auxiliary heater at connection -5- → Rep. gr.20 (Separating plug-in connectors).
  Note
Observe safety precautions when working on the fuel supply system → Rep. gr.20.
–  Hold a container under the opened connection (e.g. the container of the diesel extractor -VAS 5226-).
–  Activate -V54--1- e.g. via the “Basic setting” function for the auxiliary heater (“Line filling”) for approx. 30 seconds; vehicle diagnostic tester in “Guided fault finding” mode.
–  Observe the fuel which escapes at connection -5-.
  Note
If after 30 seconds fuel escapes continuously from connection -5-, the fuel line is filled completely with fuel.
–  Connect fuel line to connection -5-.
–  After all removed components have been reinstalled, switch on the auxiliary heater, and let it run in full load mode for approx. 10 minutes.
  Note
On vehicles with high-voltage system, it may not be possible to switch on the auxiliary heater via the control panel, depending on the charge level of the hybrid battery unit -AX1- and the ambient temperature. If the -J255- gets the information that the hybrid battery unit -AX1- is sufficiently charged, that there is sufficient power available to operate the high-voltage heater (PTC) -Z115- and that the ambient temperature is above -10°C, the -J255- activates the -Z115- (the auxiliary heater is not activated). In this case, the auxiliary heater can be switched on using e.g. the “Basic setting” function. For additional information refer to vehicle diagnostic tester in “Guided fault finding” mode.
 

Bleeding fuel line to metering pump -V54- (filling with fuel)

Checking metering pump -V54- with end sealing valve
–  If you are uncertain as to whether the metering pump -V54--C- has an end sealing valve or not, connect e.g. hand vacuum pump -VAS 6213- to connection ...

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