Fuel level won't raise in float bowl

Float level on Speed Demon won't raise

I have a speed demon 650. looked in the sight glass & noticed the secondary float level was a little over the bottom line & the primary at the middle line. Tried to raise the secondary by loosening the nut & then turn the screw counter clockwise. The level initially rose, so I started the car, it died so went back to look & the level in the sight glass dropped so low I can't see it now. I have tried turning the screw to raise the level, but gas squirts out & the fuel level won't raise in the sight glass. Gas is constanly pouring out of the screw when I try to open it pass 1/4 turn. I thought maybe it was at the top, but every time I start the car it dies when I take my foot off the gas. I have to pump the pedal constantly o kep it running right now.
Any help here?

Do I need to take the demon off the manifold to replace the needle & seat? I Also I looked through my summit catlog & ionly saw Holley needle & seats. Do demons use the same?