what would make a brand new edelbrock carb model 1406 flood?

Answer 1

I own a shop, a drag car & truck, and have built many of these carburetors over the years. The number one cause is; the float level being too high. The next reason would be the needle valve not sealing off. The next reason would be trash in the fuel causing the needle & seat to not seal off. Another thing that will do this is too much fuel pressure forcing the fuel past the needle valve. Finally, the float could be bad, and not floating. It could be sinking, and allowing the fuel to continue to flow. Try lowering the float level about 1/8 of an inch, and if this doesn't seem to make a difference, then replace the needle & seat valve. Your fuel pressure shouldn't exceed about 7-8 pounds. If you have an aftermarket fuel pump, then it needs to be one that has a return line going back to the tank to bleed off the excess pressure. The needle & seat assembly is very easy to damage, so caution should be used when adjusting it, and also make sure the gasket thats under the needle valve is in good condition and the seat is tight. When you tighten a seat, sometimes a tiny bit of brass will break away from where you use a tool to tighten it up with, and get down in between the needle and the seat, thus causing it to not seal off. If you have an electric fuel pump, then you "must" use a pressure regulator, or the pressure will be so much that it will flood no matter what you do.
Glad to help out, Good Luck!!!

Answer 2

Bran new? Sounds like too high a pressure from the fuel pump. It also could be the floats have been knocked out of spec.

Eldel carbs are nice due to very few things can go wrong with them and easy to work on.Unlike those holley POS.

Answer 3

Float sticking, fuel pressure too high or bad needle valve/seat or dirt particle blocking it from closing (for the fuel inlet).