View single post by gmgiltd
 Posted: 05-24-2016 08:47 am
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Joined: 07-10-2012
Location: Whitehills , United Kingdom
Posts: 152
Again my plumbing is different because I am on fuel injection with low pressure 3psi side and a high pressure 45psi side.

The line from the fuel pump outlet going to your carbs should be 8mm and there should be an 8 to 6mm T - the 6mm line goes back to the tank and originally contained the restriction- most people are not aware of it and bin it when they change out the fuel lines. It could go some way to explaining your pressure drop - without the restriction most of the pump output would just be returned to the tank.
The tank vent is another line altogether and as long as that is clear there should be no pressure/vacuum issues.