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Old 06-21-2021, 11:05 AM   #5
700rpm
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Join Date: May 2010
Location: Portland, Oregon
Posts: 5,892
Default Re: 1930 Pickup Backfiring/misfiring out carburetor

I don’t see in any of your 39 steps mention of timing. Have you checked and confirmed that it is correct? Is the spark rod pulled down to 9:00 at driving speeds? Do you perhaps have a Model B timing gear cover?

Also, after step #4, are you certain the gas line was not reinserted too far into the sediment bulb? Or that the ferrule was not too far back from the end of the gas line, which can also cause the line to go in too far? That can restrict gas flow, which will cause problems as you increase speed and demand for fuel.

Step #33 also concerns me, specifically the filter and the plumber’s line. I don’t trust inline filters, and for proper fit and materials it’s better to buy a new line from a good supplier.

In spite of my timing comment, the more I think about your trouble the more I think it is a fuel delivery problem. I’d still check both, though.
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Last edited by 700rpm; 06-21-2021 at 11:37 AM.
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