Re: fuel pressure?
Sounds like a leak inside, most likely where the brass chap that screws in for the needle and seat. Your gonna have to pull the lid off the carb and have a look.
Go gentle, they can be a bear to get lid and power valve rod and the gasket and plate all lined up for refit. A couple of lengths of all thread bout 6" long screwed into a couple of lid screw threads in the base are a great help here.
Sorry can't remember what the thread size is, 1/4 fine or 10 32 I think.
Martin.
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