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30 Closed Cab PU · 04-13-2020, 10:55 PM

Not the typical zenith carb used on most A version engines where the float bowl is in the bottom half of the carb. This is a side bowl carb, sorry do not know enough to ID it. My best guess it is a B Carb.

Just to make sure the ignition is somewhat functioning - take a spark plug lead off a spark plug, and place the free end of the lead about a 1/4 in away from the spark plug post. Turn the ignition on and hit the starter, should see a blue flash/spark across the gap. If not you also have an ignition issue.

If the intake manifold is not sealed, you will run lean, but I think it would still run, just not run well. I would worry about this later.

Sounds like you know some about carbs. If the bowl overfills the excess gas starts leaking out the air intake and/or a small hole in bottom of the air intake.

Take a spark plug out and confirm if it is dry, or flooded with gas.

Check the gas line connection and the carb gas filter to insure it is not leaking there, check the bowl drain plug to insure it is not leaking there. Same with whatever holds the bottom of the float bowl onto the carb.

Next as you indicate 1st things to look at are the float and the float valve. Float - remove and shake it and listen to see gas has leaked into it, make sure it hinges freely up and down. Float valve - remove it and exercise it, clean it out if you can. Reassemble the carb and turn it upside down with the bottom of the float bowl off, blow hard into the gas line connection to see if the float valve seals and does not leak, exercise the float up and down very gently/slowly while blowing and the valve should seal.

Am not familiar with this carb, someone else will need to tell you how to check/set the float level.

That's about all you can do without a through cleaning/adjust of the carb.

If you have a spare working carb, or can borrow one, try swapping, I believe all A motor carbs work on the b motor - somebody correct me if I am wrong.

There are good procedures for the a motor Zenith carb for cleaning/rebuilding/setting. I do not remember see anything for the sidebowl carb. Hopefully others can help.

04-13-2020, 10:55 PM	#87
30 Closed Cab PU Senior Member Join Date: Aug 2018 Posts: 2,332	Re: EOG's 1928 Model A Pickup Not the typical zenith carb used on most A version engines where the float bowl is in the bottom half of the carb. This is a side bowl carb, sorry do not know enough to ID it. My best guess it is a B Carb. Just to make sure the ignition is somewhat functioning - take a spark plug lead off a spark plug, and place the free end of the lead about a 1/4 in away from the spark plug post. Turn the ignition on and hit the starter, should see a blue flash/spark across the gap. If not you also have an ignition issue. If the intake manifold is not sealed, you will run lean, but I think it would still run, just not run well. I would worry about this later. Sounds like you know some about carbs. If the bowl overfills the excess gas starts leaking out the air intake and/or a small hole in bottom of the air intake. Take a spark plug out and confirm if it is dry, or flooded with gas. Check the gas line connection and the carb gas filter to insure it is not leaking there, check the bowl drain plug to insure it is not leaking there. Same with whatever holds the bottom of the float bowl onto the carb. Next as you indicate 1st things to look at are the float and the float valve. Float - remove and shake it and listen to see gas has leaked into it, make sure it hinges freely up and down. Float valve - remove it and exercise it, clean it out if you can. Reassemble the carb and turn it upside down with the bottom of the float bowl off, blow hard into the gas line connection to see if the float valve seals and does not leak, exercise the float up and down very gently/slowly while blowing and the valve should seal. Am not familiar with this carb, someone else will need to tell you how to check/set the float level. That's about all you can do without a through cleaning/adjust of the carb. If you have a spare working carb, or can borrow one, try swapping, I believe all A motor carbs work on the b motor - somebody correct me if I am wrong. There are good procedures for the a motor Zenith carb for cleaning/rebuilding/setting. I do not remember see anything for the sidebowl carb. Hopefully others can help.