While hand cranking my 25 the other day with the right side hood open I noticed a small amount of fuel spray coming from the back side of the carb. This happens only when I have it choked. Seems to be coming from the small hole on top of the flange. Is this normal?
No. If I'm understanding your description, there shouldn't be a hole there. How about a picture?
I have several carbs like it and they all have this hole. I think it a Holly but I could be wrong I will look tomorrow.
If you mean the little vent hole on the engine side by the choke shaft, yes that happens sometimes when choked. If the needle sticks open then a steady stream will come out there.
Corey is right!
There is a vent hole on the back side of the NH carb.
It is either under the metal tag or near it.
I believe that it is there to allow the air to escape from the bowl as it fills up.
When you use the choke a small about of gasoline sprays out.
It seems to be normal operation.
I suppose we're talking about the vent under the data plate. I wouldn't call it next to the choke, and it's certainly not in the flange. This is why pictures are usually better than a verbal description.
I think this is an NH. It shows the float chamber vent. Yes it can spray gas out when cranking.
Yes, that's the one, float chamber vent. Wonder why they put 2 vents? Seems like that one or the one under the name tag would have been enough. A Holley G only has one vent.
I think I figured it out. When the choke is closed it has to get some air inside where the gas is mixed and air couldn't get there from inside the bowl. The G is different design.
If you want to order parts here is a parts drawing...
After looking at my Model T book I have decided that my carb is a Kingston L4. It is on my 25 Fordor.
L-4 has the same vent hole in the same place.