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I thought we had all this worked out a few months ago. Any way...If your turbo is a "dry" type you can not draw through the carb and push into the intake. There are no seals in the carb to prevent fuel and air from entering the oil in the bearing housing. You must blow through the carb on a dry type turbo. Use a fuel pump to give positve fuel pressure to the carb to prevent pushing the boost past the needle valve and back into the fuel tank. Lacking a fuel pump will not prevent your using a dry turbo. Use a vent hose from the turbo/intake manifold to the fuel tank. You will have to use an unvented fuel tank cap to prevent the fumes from the tank from being draw into the intake while it is under vacuume and a loss of pressure under boost. This line will also need a check valve that would allow pressure to flow into the tank but prevent fumes from the tank being drawn into the intake. The dry air from the turbo will give the same pressure inside the tank as the fuel bowl sees under boost and therefore the fuel will still flow under gravity feed into the bowl. You only have to worry about getting enough fuel to flow under gravity to prevent starvation and a very lean condition. I highly recommend a fuel pump to prevent this. As far as intercooling is concerned, never try to intercool a wet turbo. You are asking for big time troubles. Now I have a question. How good are the throttle shaft seals on your carb? Any leaks under pressure here will send fuel/air mixture into the crank case via the govenor. You may have to put a hose from the linkage tube to the inlet side of the turbo to prevent contamination of the engine oil and pressurizing the entire crank case with fuel and air. Have you ever heard of blowing the seals and gaskets from and engine due to an internal explosion? Gauranteed to get your attention.
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