De Jeeper

If its the one that goes to the change over valve, its behind the alternator attached to the grey valve that goes to the vaccum accumulator. Its thin, black hard plastic line.

DBJoe996

Here are the vacuum lines

Wayne Walters

would that be #14 hose?

De Jeeper

No, 14 is the pressure supply line that feeds the motor from the sai pump. #28 is the vac line. Its sold in 1 meter sections from porsche. It goes from the accumulator (#6) to the change over valve(#18) to the valve to allow the sai to enter the motor.

All of these parts must work, be in tack or be connected for air to get from the pump into the motor. Its an overly complicated system.

Basically an electrical signal trips the change over valve to open, the vacuum then opens the sai air valve to allow pressurize air to flow into the motor.

If the hose before the change over valve is broken u will see it in the fuel curves, idle performance and during a smoke test. If after the c/o valve it will only leak when the sai is called to run.

In addition to the hose the c/o valve and the sai air valve can both fail but the can be bench tested.