Very interesting observation after doing 200 km today:

Idle speed is lower ! I now get 750 rpm warm in N and around 550-600 in D. That is appr. 150 rpm lower than before I changed the pump.
I suppose the change must be caused by a too lean mixture with the old pump ?

 

would need an air/fuel ratio gage to measure mixture!

seems one that measures in LAMBDA is best in these days!

 

Thanks Ronbros. Yes, a visit to a garage to measure lambda would give an idea, but I'm not going to mount the old pump again just to get the reference value

Idle is now back to normal (and slightly too high), so it has probably been something else influencing the idle. Did another 100 miles yesterday, I love this car !

BR Leo