I put the one way inside the body at the back. The breather runs from inside the tank to the one way through the perch. The end of the pipe that goes to atmosphere is then run down the body and out of the floor through a tight fitting hole.
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I glassed in a bracket to hold it firm.
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The breather tube in the tank goes right up into the filler neck and ends up just under the fuel cap. Its the one sticking out the top of the centre section.
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This way its all hidden and the vapour exits under the car in the middle of the chassis away from the exhausts.