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user Richardson made one for a RRC from drain pipe etc.water tight but the configuration played havoc with his lpg conversion I recall.....made it run lumpy on idle.This is why ours is not connected. Running on LPG it's very important that the back side of the evaporater is at the same atmospheric pressure as the inlet. Ram air or excessively long air intakes play havoc with this. One sloution is to make sure the vent to the evaporator diaphram is connected by a pipe to the air filter and not the underbonnet.I've heard of people cutting the trumpet of RR EFi airboxes or fitting weather strips to the bonnet to overcome this problem.