Marlin,
I see your logic and i feel you are quite correct.
The shooter size has more effect over fuel delivery timing rather than the total volume of fuel delivered.
As you say the 25 shooter nozzle will deliver the pump shot over a longer period of time and the 40 will deliver the same amount of fuel over a shorter time. It is the pump cam that governs the amount of fuel.
Your description of the pump spring adjustment is spot on, exactly what i have been trying to get across.
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