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surging and rough running

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tahoe healey said:
Dave, my comment about the intake manifold is that there are the two copper tubes coming from the bottom (that drip fuel below the exhaust). If it is a vacuum in there why doesn't air go up those tubes?
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Air does go up the tubes. Because the tubes have such a small inside diameter & are so long they represent a very small leak. Not enough to affect engine running noticeably.
D
 
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