Diagnosis, please

Posted by Wat_Tyler On 2022/5/30 17:59:46

I took Fred the Deluxe sedan out for a spin this afternoon. It was running happily. On the way home from our errand and to celebrate having made break-in status, I put my foot into it. Hard. To the floor. Second gear at 35MPH and pulling, maybe. It pulled for a couple of seconds and then gave it a big old stumble. It was hard to tell if it was fuel or fire, but after a few seconds, it resumed going and we got home. I never put in the clutch, and I took my foot off the throttle. We resumed after the second trial pat to assure it was back to running again.


Conditions:
outside air at the time: mid 80s and sunny. It had been parked in the sun for a few minutes, and it's black.
Operating temp: 195*F. That's where it operates.
Engine: rebuilt almost 600 miles ago.
Fuel system: stock/original. Think the tank and line were flushed when rebuilt or to get it to run after 35 years of sitting.
Fuel pump: stock, rebuilt with engine.
Carb: may need a rebuild - maybe. 512S. New carb awaiting - something.
Electric fuel pump: in the box awaiting installation
Ignition: seems fine, but could likely use a good going through (gaps and such). Pretty sure it was all new goodies when rebuilt.


Could this be an example of the dreaded Vapo(u)r Lock???