I was hoping you found a fix for the excessive FT pressure (assuming your car had that condition) by replacing the FT Purge/Vent Valves.

Were you also trying to diagnose that specific problem? It sounds like you replaced some items because they were old etc., while chasing another condition.

I'm still after the Cause/Effect in the excessive (sounds excessive to me) FT pressure department and whether this condition might cause the Fuel Pressure Regulator diaphragm damage.

I'd like to find the procedure to test the FT Vent system (FT, Purge Valves, Charcola canister, vaccum interplay, etc.).

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Michael Stoic

1979 450SLC
1989 300SE