1941 Packard 8 model 1951
Flange : 1" dual, 4 bolt style
Float level: 5/32" - distance from float bowl cover, when needle is seated.
Gas line connection: 5/16" Weatherhead nipple.
Idle adjustment screw - initial setting 1/2 to 1 1/2 turns open.
Unloader: 3/16"
Choke: coil setting on index
Metering Rod jet 120-125
Metering Rod: 75-451 - standard, 75-519 - 1 size lean, 75-520 - 2 sizes lean
Pump Adjustment
With pump connector link in place and throtle adjustment screw backed out, pump plunger should travel 7/32" from closed to wide open position. Adjustment can be made by bending throttle conector rod at lower angle.
Anti Percolator Adjustment
Done after the pump and metering rod adjustments.
When the carburetor gets hot and the throttle is closed, the gas can percolate (boil). This is especially true with today's gasoline, which has a lower boiling point. The Anti percolator can help with this percolation.