Proper 300E Fuel Pressure is...
 

I don't know! But what I figure is, the upper chamber of the fuel distributor does not have an adjustment like the lower chamber (EHA), as it relies on a good functioning fuel pump, regulator and accumulator for its pressure while the lower chamber relies on the EHA.

Now... what is good upper chamber pressure and do I just set my lower chamber .4 bar lower to get it within spec.?

YGPM.