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When I took my engine out, there were 3 vacuum lines. A big one from the manifold went to the brake booster, one small one from the carb went to the distributer but the other smaller from the carb went to a copper tube that disappeared down to the RHS of the bulkhead.

It bugged me trying to think what it'd be for... a few weeks later, whilst replacing all the hoses, I blew into it to see if there was any resistance... free flowing. I removed the fuse box cover at the front right and there was the copper pipe disappearing up under the dash...only for about 6 inches and then it turned to a rubber tube... of 2 inches... dangling free. Vacuum gauge or boost gauge??

@simon posted:

no think not, the copper pipe  has not a logical route for this.

first I was thinking it was for venting the battery caps, like how a 69/70 Mustang Boss429 use a hose for venting the battery into the trunk.

Simon

I would assume that the objective would be to keep the hydrogen away from the Parts which could ignite the hydrogen..

routing it TO the engine compartment, would be counterproductive… 💥

Last edited by LeMans850i

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