Hi Jeff,

I'm certainly no 2.0L aircooled expert as my expertise lies with my 3 2.1L
WBXs(for which Stan Wilder thinks I'm an idiot - but that's another
story...). However all Bosch fuel injection systems function the same in the
following areas:

Upon shut down a one-way check valve closes in the fuel pump outlet.

The fuel pressure regulator lacking vacuum, closes completely.

This action traps fuel under pressure behind the fuel injectors.

This function is called "residual pressure" retention and is designed into
the fuel system to counter vapor lock during hot engine restarts.

When a hot engine is shut down, a substantial "heat surge" occurs in the
engine compartment.

The residual pressure retention function counters the chance of a hot
restart vapor lock by raising the gasoline's boiling point. Almost all
cooling systems operate at peak temps above 212*F using trapped system
pressure to raise the coolant boiling point.

If the required residual pressure is not held for 30 to 90 minutes, a vapor
lock and a labored hot hard restart will occur. over time it's OK for the
residual pressure to bleed off as the engine heat soak also bleeds off.

Check the fuel pressure per the Bentley and then shut the engine down and
monitor the residual pressure. 1.5 bar to 2 bar would be good.

Also be aware that if the residual pressure is lost in a short time, it may
not be a leaking fuel pump outlet check valve or pressure regulator. It
could also be a leaking injector which would "wash down" the cylinder walls
weakening the piston ring oil seal and causing a compression test to
indicate low compression values................

Regards,   John

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