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Drop the fuel pressure to about 3 psi. I have seen 5 psi overcome the floats and cause fuel to drip. There is also a condition called "The Dellorto Drip" caused be loose lead casting plugs. With the fuel pump on and engine not running there should be no dripping fuel. If they drip with the fuel pump off and float valves closed, the carbs have "The Dellorto Drip" If they only drip with the fuel pump on, the pump pressure is too high. The "Dellorto Drip" can be fixed by replacing the internal lead plugs.
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NO_H2O
72 1302 Smack Black GL
73 Bus (2L CIS Powered)
66 Beetle, 73 Standard Beetle
72 Pinzgauer 710M
Volksport Kafer Gruppe
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