Matt@TYGA wrote:Pressurise the airbox and pressurise the float bowls. Yep, that's a start. The it runs lean at the top because the pressure in the tank is now lower than the float bowl so the fuel won't flow.

Surely the 'majority' fuel flow is due to gravity (whilst recognizing that a blocked breather in the tank can reduce and finally stop fuel flow) - Is pressure in the tank really such an issue ?