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Yes, that 4" (LONG I assume, not diameter!) plastic tube MAY be for a switch-over valve that the AIR injection pump uses. (PS there is a reason why the AIR is capitalized, it's short for Air Injection Reaction, I believe).
The usual repair is to simply buy another length of tubing, a dealer should have some. Short of that, another appropriate repair is to find a section of rubber vacuum hose which the proper inside diameter so the plastic tube will slide snuggly into the hose. You may find this at a hardware store or easily at an auto parts store. I doubt the auto parts store will carry the plastic tubing though, you could ask. Can you get to both sides of the broken pipe easily. If NOT, just repair it with the rubber hose idea.
Gilly
PS to you and also Steve: Is it possible the broken plastic pipe is actually a vacuum line which is now leaking vacuum, and this is the WHOLE problem? With the engine running, put you rfinger over one end of the broken pipe and see if you feel vacuum (suction), check both broken ends. Do it before ordering a thing!
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