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Model-A.org
The Place for Model-A Ford Carburetors
Model-A.org
The Place for Model-A Ford Carburetors
Upper Casting Air Adjust Screw Passage is restricted to vent hole.
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Causes
Loose fuel line fitting, drain plug, filter strainer, GAV, Passage plugs, etc..
Float is set too high or a Pin hole absorbs gasoline into float.
Float Valve does not seat properly due to Dirt, Rust or Material Failure.
Gaskets are not sealing properly.
Gasket at Main Jet is too thick or multiples are used, resulting in tip being too low.
Main Jet or Cap Jet Tips is not "dished" / "indented".
Vacuum leaks at Manifold gaskets, wiper line, or Throttle shaft.
Throttle Idle Adjust Screw is Mis-adjusted.
Idle Air Adjust Screw is Mis-adjusted or too short, collapsing spring before it seats.
Upper Casting Idle Jet Passage is restricted to Idle throat port.
» Upper Casting Air Adjust screw Passage is Restricted to Vent hole.
Idling Jet Orfice contains dirt or rust, or is too small.
Idling Jet Orfice is too large.
Gas Adjusting Valve is open too much or Seat is not honed to let needle seal.
Gas Adjusting Valve Brass Seat is Missing from Carburetors built through 1929.
Lower Casting Bowl Passage is Restricted to Secondary Well via GAV Seat Hole.
Lower Casting Comp. Jet Passage is Restricted to Cap Jet via Secondary Well.
Compensator Jet Orfice contains dirt or rust, or is too small.
Compensator Jet Orfice is too large.
Float is set too low.
Lower Casting Bowl Passage is Restricted to Main Jet & Drain Plug.
Main Jet Orfice contains dirt or rust, or is too small.
Upper Casting Fuel Line Passage is restricted to Float Valve via Strainer.
Gas Adjusting Valve Seat is Blocked with dirt or rust.
Air Filter is Restricting Air Flow.
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