Just read this thread and most have covered the obvious – here’s my two cents:

I’m assuming we’re talking about a 1406 here. They’re typicayl a great unit from ease of installation and long trouble free operation. I find them to be a bit rich out-of-the box sometimes, but that can easily be addressed with jets and rods.

6 PSI is boarder line on the high side with this carb – I wouldn’t probably go as low as 3-½, but would go down to 4-½ or 5 PSI. Do you have an actual gauge in the fuel line just before the carb?

The fuel/air ratio should be fine out of the box. If you’ve messed with it, gently bottom both idle screws and back out 1-½ turns and that will be fine for this application. You may need to “fine tune” after you get things running well.

Ten seconds is just about what it takes to empty the fuel bowl. As such, I would suspect the following:
1. Crud in the fuel screen assembly where the fuel enters.
2. Stuck or hanging float – Possible but not too likely on a new unit
3. Mis-adjusted float - Possible but also highly unlikely on a new unit
Did you put a new fuel filter in between the fuel pump and the carb? If not my money is on number 1 as there is a very high probability that sediment from your fuel tank has passed into the carb and some woolly-buggers have lodged around the screens (there’s two of them) that actually protect the needle and seat assembly in this carb.

If you don’t have a good fuel filter and in fact crud has entered into the carb, the only way to remedy the problem is to remove the top of the carb and very carefully remove the floats, then the needle valves and unscrew the seats to allow the screens to drop out. This is best done in a very clean and well lit setting and if you’re not familiar with the carb, download the manual from www.edelbrock.com as it contains some real helpful information and pictures.

Good Luck,
Glenn