[greenwater]

Eljaro,

The way I found out the excessive fuel pressure was a simple no risk one: I took out the electrical fuse of the pump out just few seconds before actually shutting the engine off letting the motor running with the pump desactivated for 3-4 seconds....I've tried it twice and it stopped immediate while it would keep running always since I had the car on the road since last may....since I really know how irritating and time consuming and frustrating a problem I really wish you find it!

But as long the fuel regulator won't be on I cannot be 100 percent sure of the issue but surely looks like it.

good luck.