Hot Rods Stromberg AA-1 CARB Issue

After rebuilding our stromberg AA-1 carburetor for a 1949 Buick engine as soon as we hook up the gas to the carburetor it gushes into the intake. It seems to be leaking through the jets. We have adjusted the float to spec but this continues to be an issue. We are running a gravity fed fuel system for the time being so I don’t expect it is receiving too much fuel pressure. Any ideas?

Thanks,
TR

 

Are u sure the “needle in fuel inlet” is really seated. Fuel shouldn’t pass to other parts of the carb unless the seat is not seating. Take out needle and lightly sand with some mild abrasive to make sure it is somewhat concentric then look at the actual seat with a strong light and see if it is corroded or pitted allowing fuel to leak past it and into the carb. Since there is no real fuel pressure,u have problems in the fuel inlet where the needle and seat are located.

 

Mustie1 uses a Q tip in a drill and some toothpaste to clean the seat.

 

The fuel inlet valve would be the first check.

Other possibilities would include:

Defective power valve (possibly caused by using the wrong tool to install)
Pump bypass and power valve interchanged.
Defective float

Jon

 

An old Buddy of mine just purchased the inventory of a defunct automotive warehouse. He has about 150 N.O.S. or factory rebuilt 40's thru 60's carbs. I can check today and see if there is one of those carbs available if you would like.

 

Thanks for the input, we’ll try out these ideas and I’ll let you know what ends up working out. Salt racer, that’d be great as a backup, but in the mean time we’re dead set on getting this one sorted out.

Thanks,
TR

 

We’re out of ideas on this thing. It is not leaking out of the jets but is actually leaking out of the secondary idle air bleeders.(Labeled 13 on the manual below.) It almost seems like their is a check all stuck open that is hiding from us somewhere. Also shown below are two angled wires that fit inside a hole on the base a middle body of the carburetor. They have a long and a short side and it’s possible we have them upside down. We’re not really sure of their purpose though. Any more input would be appreciated.

Thanks,
TR