Carb. overflow

My '66 roadster was having a bad day - running poorly. The short story is I forgot to tighten the dizzy bolt after the last timing. When I brought it into the shop, I noticed a fair amount of raw gas dripping from the bottom of the car. I traced this to the "overflow" tubes coming from one of the carbs. After I reset the timing, the overflow condition appeared to stop. Can anyone tell me what causes the overflow? Do I need to rebuild the Carb(s)? First time I've ever seen this.

Thanks for your interest.

Ken

usually it is caused by a bit of crud getting into the needle and seat. sometimes a vigorous light tapping on the fuel inlet (like with a screwdriver) with the engine running will dislodge the dirt and fix it. if it doesn't

1 carb or both? If both, suspect fuel pump pressure. If you have an SU pump this is unlikely to be it.

2. replace needle and seat


3. search on the forum. you will find dozens of threads on this same exact topic, several in the last couple weeks.

1 Remove carbs.
2 Open and inspect float bowl area(s) needles and seats.
3 Wonder why the flooding problem? (scratch head) Everything looks clean.
4 Re-assemble. All better.
5 I think the secret is how you scratch your head and how long you stare in disbelief at your disassembled carbs. The longer the scratch/stare, the better chance it will work.

Worked for me!