You can’t adjust a float on the secondary side if it’s already full.
Your not using fuel out of the secondaries sitting at idle and that’s why you see no change when you screw the adjustment down.
Loosen the bowl and drain it.
Then screw you adjuster clock wise until it lightly stops.
Start the motor and start backing out the needle and seat adjustment as you watch for the fuel to come up to the level.
Tighten down the locking nut.
