A question while all the above is still fresh in everyone's mind .
I've seen all the fuel pump tweaks , grinding the fuel pin etc though i admit i've not yet taken a keen interest .
Wouldn't Yanmar/Yamaha injectors (assuming the are a straight swap?) add more fuel as and when Toyota intended with the factory set up calling only for more boost pressure to get a clean burn ?
Its all guesswork from my end so be gentle but i have a vague notion that the pump doesn't so much measure fuel as fuel pressure , and so a more free flowing injector will add more fuel at the same pump pressure as is standard .
Does that make any sense ?