Originally Posted by tunaglove
If I had an adjustable fuel regulator I could just crank the pressure and see which way the trims go,
From what I understand, you do have one, just don't know it
According to posts by waldig (IIRC), the vent port on the regulator will double as a reference adjustment port. So if you were to connect a rubber hose to it, then the other end to a pressure source say a bicycle pump with a gauge, and put 10-15 psi air on it, the rail pressure *should* rise accordingly. Then you should see some movement in the trims.