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  • Vapor Canister

    I have been chasing a vacuum leak and I believe that it is coming from the diaphragm in the cap of the vapor canister. When it was idling (now it doesn't) I could here a big hiss coming from the cap. Things that I have read say that this canister should not purge while idling. Has anyone had to replace theirs? If so, where did you find a replacement? I went to the local Jeep dealer and they told me this part is no longer manufactured and junk yard availability is limited. Any information would be helpful.

    1986 CJ7 Laredo, 258- 4.2L (stock emission controls), T-5

  • #2
    Just sent you a PM, by youre avatar thought you were in SE wisconsin. Any way, got a canister bouncing around the back of my pickup out of an 81. Its youres for the cost of shipping. PM me.


    • #3
      Do you have it hooked up correctly? it should be connected ultimatly to your ported vacuum through the CTO so it only opens when on the gas.

      There is a signal port on the canistor and if you have a vacuum on it when idleing then that's your problem, if there is no vacuum but it's still hissing then the problem is in the canister


      • #4
        You mean the vacuum reservoir(passenger side, firewall)? I assume you have the crappy original metal can? I replaced mine for the same should hold pressure all the time. To be honest, mine is replaced with a plastic round ball shapped one. I googled it and found a company. I don't believe our host has them....bad word but I think I got it from Quadratek...just google vacuum canister/reservoir....