I am having a start on second crank issue and to make the story short, I've checked plenty of things, I'd like now to check if I do not have a fuel leak at the injector or distributor level. Visual external check returned nothing.

So I'd like to check if lower and upper chamber of the fuel distributor hold pressure or not, to start with... and also because I replaced EHA, I'd like to check if the differential between lower and upper pressure is correct.

Where to plug manometer to get the upper and the lower pressure reading?
What are supposed to be the pressure reading engine running or stopped?
How long the pressure in both chamber is supposed to hold, engine off?

Would an injector leak conduct with time in slightly pressure drop in the upper chamber when engine is off?

Thanks.

__________________
From 300CE to SLK230K