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Headlight Vacuum Storage Canister Replacement Question

91-Vetteman

Well-known member
Joined
Dec 26, 2002
Messages
105
Location
Richmond, VA
Corvette
1991 Blue Coupe
I bought a new Headlight Vacuum Storage Canister" (looks like a coffee can) for my 1981 from ZIP and I went to replace it this weekend and it is configured slightly different.

3 vacuum hoses connect to this cannister. On the new cannister one of the hose connections (the smallest diameter hose) is sealed off /closed. The other two connections (the 2 slightly larger ones) are open as the original.

I have an email into ZIP technical folks asking why the difference on the new (I am assuming this is a reproduction cannister) cannister. Does anyone out there have any guesses why the new can would have the one hose connection sealed up ?
 

craig32

Well-known member
Joined
Sep 30, 2004
Messages
482
Location
PA
Corvette
1981 repainted black coupe
Hey John, I'm pretty sure my 81 only has two hoses going to it, with the other one sealed, you have a third hose going there?? If I dare ask, what do the canisters go for? I've heard folks say they are pricey.

Craig
 

91-Vetteman

Well-known member
Joined
Dec 26, 2002
Messages
105
Location
Richmond, VA
Corvette
1991 Blue Coupe
Hi Craig, yes, I have 3 hoses, I will try and trace themn down this weekend. Here is the info on the replacement cannister at ZIP, 80-82 VACUUM TANK RESERVOIR, Product Number: M-2661 and it was $45.
 

91-Vetteman

Well-known member
Joined
Dec 26, 2002
Messages
105
Location
Richmond, VA
Corvette
1991 Blue Coupe
I traced my vacuum lines off of the cannister this weekend. One is the supply vacuum and the other two go to each headlight control valve. I also got a response form ZIP technical below. I will be inserting a T as described below.

The reason why the canister only has two holes is because it is a reproduction of the 82. The 80-81 had 3 holes in it and when the last GM that you could buy only had two ports. You are going to have to T one of the vacuum lines off, you want to T the lines that come out of the canister going to the headlights. Do not T the line that supplies the vacuum.
 

minifridge1138

Well-known member
Joined
Feb 2, 2007
Messages
908
Location
USA
Corvette
1982 Black Fastback
I have heard that Zip's vacuum diagrams are wrong.
I would just install it the same way the old one was installed.

If you don't remember how the old one was, then I'd try a Chilton's, Hayne's, or GM Assembly Manual.

Good luck,
(p.s. i former chevrolet mechanic told me that it actually IS a folder's coffee can)
 

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