Ok ive decided to finally crack on and fit the malpassi fpr onto the van to try and cure the emptying the float problem in higher gears.
I have refitted a stock size needle jet in place of the 2.1mm i had fitted. Carb was working fine with the original regulator fitted (by fine i mean no overspilling the bowl).
I have fitted the reg, with base pressure set at 4psi the carb is dribbling fuel down the aux venturi
fuel level too high in float chamber??
When fitting the reg i have upgraded the fuel line from the reg to the carb to 8mm, i changed the fitting on the carb to 8mm fitting off the original reg. Could this be the problem?