Re: fuel pressure?
5 is a bit to high,
I'd pull the lid to see where the leak is coming from.
The gas is coming down the gas line and the inlet pipe for the choke. For it to come down the choke inlet pipe, I'd say it's quite a leak.
Pull the lid and have a look, could be as easy as a fitting not snugged down tight enough.
I know you haven't had the pump rebuilt, but it would have been rebuilt or replaced in its life, they don't last forever. So could have the wrong spring put in it at this point. I mentioned this as you said it was leaking exactly like this before the carb was rebuilt. Which usually would eliminate the carb as being the issue. Usually, but this would be an assumption.
I'd still pull the lid, and guess I'd be looking at the brass fitting up the back of the needle and seat assembly.
Could be an easy fix, rather than guessing.
Martin.
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