When you say you have freshly re-built SU's, what has been replaced? There are two types of float, old style where the arm is metal, hasn't been available for years. Or new style, where the hinge on the float is made out of the same material as the float itself.
If you have the new style floats, you need the matching lids. The geometry is different. You'll never persuade new style floats to stop leaking with old lids. I've found new lids, new floats, and the Viton tipped valves to cure the leaking problem.
Note the Viton tipped valves are slightly bigger than the originals, but it's not a problem.
Pierburg fuel pumps are OEM.
Regards
Pete
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