Hello Matthew , yes engine vac looks better there , is the guage nice and steady with minimal fluctuations?could you bring the other pump back in like I said to see what happens with trims ?
Fuel pressure .....does the fuel rail have a feed and return line , in most cases the pump or pumps will over supply the engine so a lot of fuel is returned back to tank , all engines are different but at idle you would get a couple of litres return flow back to tank , if there is only a dribble from return line you know you have an issue , so when engine demand outstrips flow this is where fuel pressure will go down .
I've seen fuel pressure at spec idling ,but on the road under load it can just drop away and you end up with the lean fault codes
Interesting one this keep at it , test ...rule out .....move on , every test gets you closer to the fix ....structured diagnostic pathway .....keep away from 'guess a part ' diagnostics
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