Volkswagen Front Wheel Drive 1974-1989 Repair Guide

Relieving Fuel System Pressure


Engines equipped with electric fuel pumps maintain fuel pressure even when the engine has not been run. This residual pressure may remain in the fuel system for several hours after the engine is shut down.

To relieve the fuel system pressure, perform the following:

  1. Start the engine and allow it to run at idle speed.
  3. Locate the fuel pump electrical connector and disconnect it while the engine is running.
  5. Operate the engine until it runs out of fuel and stops.
  7. Remove the fuel filler cap.
  9. Disconnect the negative battery cable.

Have a container ready to catch the fuel that will squirt out when you loosen the clamps or couplings on the fuel system components you are working on. Wrap the connection with a rag and slowly crack the connection to vent any residual pressure from the system. Once all the pressure is relieved, loosen the connection.

  1. Proceed with the necessary fuel system component repairs. When finished, engage the fuel pump connector and connect the negative battery cable. Don't forget to install the fuel filler cap.