Just make sure you don't cap off the charcoal canister feed from the gas tank.
Pressure/fumes from the tank get stored in the canister.
Oh wait, if you remove the canister and cap the line, you run into fuel system problems!
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Do what you want with the vacuum lines, but don't mess with the design and function of the vapor system for the fuel tank.
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I suggest keeping it all, and forgetting about touching it entirely, until the rest of the car is built, functioning 100%, and then you can "think" about removing things because race-car/show-car.
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