Greetings.
Two seasons ago, we had our 21 Model T Coupe at the OCF at Greenfield Village in Dearborn MI. While there, we had an issue with our carburetor that lead to a serious loss of power. The mechanics at the Village helped us out by adjusting something in the carb (I recall them fiddling with the brass float in the carb, but I'm not certain). Now, we are having this same issue again. Can anyone help to let me know what the issue is so I can address it myself?

Thank you.

Hi Daniel

I'm no expert but it sounds like the situation I just had. No power and a miss at a higher RPM, and in my situation it turned out to be the size of the interior of my fuel line and it's routing. Temporarily I put a 5/16" rubber fuel line in as straight as I could get it (routing behind the frame away from the exhaust pipe). I think I was starving the carb. Not sure but i hope it helps.

Murray

Daniel

Gas starvation is a cause of low power. The carb float may need adjustment. Or you could have a clog in the fuel system. Check that first. Do the checking from the source to the carb. The sediment bulb under the tank may need cleaning if it hasn't been done in years. There is a fine wire mesh over the outlet port, under that big 4 corner nut. Any debris over that screen hampers gas flow.

The T gravity system is only 1 psi. Then check the fuel line. And elbows. Clean any debris by blowing air thru the lines. Final test is to unfasten the gas line at the carb and notice full full. Then reconnect and then open the gas drain under the carb bowl. There should then be a full strong stream of gas draining. That will check fully the gas supply. And that the float needle valve is not sticking. If there is low flow, then suspect the float needle setting and readjust to the method shown in the Ford Service Manual.

Another cause of low power is too rich a mixture, adjust the carb setting for a more lean running and power.

UPDATE:

We started the car for the first time this year. We have a leak at the exhaust manifold and at the base of the spark plug. Both are on the first (closest to the radiator) cylinder. The exhaust manifold leak is an easy fix. Any ideas on what to do about the leak around the threads at the plug?

Teflon tape. Dave

If you're talking about the little bubbles that sometimes leak out, I would ignore it.

BTW, is the plug screwed in tight?

David & Jerry, thanks for the responses.

David, I thought about teflon tape at first, but I didn't / don't know what sort of temperatures teflon tape will withstand.

Jerry, I need recheck that the plug is tight, but it is not a little bubble, we have oil spritzing out around the threads along with a gasp of air, and neither of the other 3 have so much as a wet look to them.

Daniel, Teflon tape will stand a lot of heat. Teflon is used on cookware. It will also help make the plugs easier to remove. Dave

You can also clean up the plug holes with a standard 1/2 inch pipe tap.

1922 T won't start, but backfires a real blow. What to do?
Thanks!

The first thing "L" is to start a new thread to ask your question. It will get more attention than burying it in another thread.

Second, check you spark timing. It sounds like you're way off.