Fuel from alternating vent tubes.

[IanC]

I rebuilt my carbs and she runs like a champ BUT.... after a couple days of running fine today I noticed fuel pouring out of the #2 vent tube. I think stuck float and bang around on it and it switches to the #1 vent tube pouring fuel. It seems to alternate between the two. Any ideas? I can't see the floats switching turns sticking. Also it's not constant. It pours, peters out a bit then pours again for a few seconds.

[tkent02]

Vents or overflows?
Either way you have a bad petcock if it's doing it when the engine is not running.
Needle valves sticking too.

[IanC]

Overflow. Sorry. Bottom of the carbs.

[tkent02]

Is the engine running at the time?

[IanC]

Yes. Only ****es gas when running.

[tkent02]

OK. the petcock is fine. Probably you have a piece of crap holding the needles open. The last time I had this problem there was a little chunk of wood that somehow got into the needle.

[IanC]

Would that happen to 2 carbs at once? Or would the overflow from one carry over to the other.

[tkent02]

No, they are separate. One other thing that happens is the valve gets smashed a little if you pull on it with pliers, then the hole isn't round inside and the needles get stuck.

[IanC]

The needles are new and were fine when I put the carbs back together. Guess I'll step outside and drop the bowls the check on things.

[chuck hahn]

Tom..what about float heights?? could that cause the float needle to not seat all the way? And therfore overflow the carbs?

[tkent02]

Tom..what about float heights?? could that cause the float needle to not seat all the way? And therfore overflow the carbs?

Not if they were anywhere close to adjusted right.

[chuck hahn]

As you know..I am trying to learn too!!

[OldVet66]

Mine does that now and then. I just rap the side of the bowl with the plastic end of a heavy screwdriver and it stops. It's done it two or three times in several years.

[IanC]

I checked the float heights both during assembly and with the handy dandy tool from Z1Enterprises after the carbs were installed. I dropped the number one and two bowls and checked on things and they looked fine but had no problems after I put them back together. I assume debris the chem-dip missed found it's way in to them.