Hose route for the gas tank vapor container

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    Author Topic: Hose route for the gas tank vapor container  (Read 5365 times)

    Offline Chlngrcrzy

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    Hose route for the gas tank vapor container
    « on: April 01, 2014 - 10:39:12 PM »
    I have the vapor canister in the back, in front of the gas tank. Has the 4 small hoses that connect to the gas tank. Where does the his run that connects to the top of the small canister?
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    Offline cudabob496

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    Re: Hose route for the gas tank vapor container
    « Reply #1 on: April 01, 2014 - 10:56:23 PM »
    I think on my 72 it ran along the passenger side, up front, to a charcoal canister in the engine bay,
    but its been a bout 20 years since I tore all that stuff out.
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    72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

    1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

    2011 Kawasaki Z1000

    Offline Chlngrcrzy

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    Re: Hose route for the gas tank vapor container
    « Reply #2 on: April 02, 2014 - 09:17:28 AM »
    Quote from: cudabob496 on April 01, 2014 - 10:56:23 PM
    I think on my 72 it ran along the passenger side, up front, to a charcoal canister in the engine bay,
    but its been a bout 20 years since I tore all that stuff out.
    Yeah, me too. I wonder if i could just plug it off?
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    Offline 72cudamaan

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    Re: Hose route for the gas tank vapor container
    « Reply #3 on: April 02, 2014 - 09:34:27 AM »
    Quote from: Chlngrcrzy on April 02, 2014 - 09:17:28 AM
    Yeah, me too. I wonder if i could just plug it off?

    You could, but it is your tank vent. Might have some problems. It still works even if it's not connected to a
    charcoal canister.
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    Andy  (phukker whither)

    Offline blown motor

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    Re: Hose route for the gas tank vapor container
    « Reply #4 on: April 02, 2014 - 09:49:40 AM »
    Andy, mine was still sticking up in the front corner of the engine bay even though the cannister was gone. We clipped it off under the car with a side cutter and got rid of it to tidy things up a bit under the hood. Is this going to be a problem?
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    Offline Chlngrcrzy

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    Re: Hose route for the gas tank vapor container
    « Reply #5 on: April 02, 2014 - 09:57:14 PM »
    Any ideas where to buy the cheapest canister? Autozone sell these things?
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    Offline cudabob496

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    Re: Hose route for the gas tank vapor container
    « Reply #6 on: April 02, 2014 - 10:14:47 PM »
    Quote from: Chlngrcrzy on April 02, 2014 - 09:57:14 PM
    Any ideas where to buy the cheapest canister? Autozone sell these things?

    I'd make it out of 2 or 3 inch PVC pipe and some aquarium charcoal.
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    72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

    1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

    2011 Kawasaki Z1000

    Offline 72cudamaan

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    Re: Hose route for the gas tank vapor container
    « Reply #7 on: April 02, 2014 - 10:38:12 PM »
    Quote from: blown motor on April 02, 2014 - 09:49:40 AM
    Andy, mine was still sticking up in the front corner of the engine bay even though the cannister was gone. We clipped it off under the car with a side cutter and got rid of it to tidy things up a bit under the hood. Is this going to be a problem?

    I would probably make sure it points down so as not to pick up moisture but as long as the tank has a vent you
    should be okay. On the other hand I suppose a vented gas cap would work as well. Also keep in mind that the termination
     point on the vent hose should be higher than the gas tank to prevent a siphon effect.
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    Andy  (phukker whither)

    Offline jmkdopkins

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    Re: Hose route for the gas tank vapor container
    « Reply #8 on: April 13, 2014 - 08:12:37 PM »
    I need to replace the leaking gas tank on my 1973 Cuda 340.  My new replacement tank will have the 4 vents on the front of the tank. But looking at my car, the old tank has 1 vent on the side of the tank and its hose runs into the engine compartment. The hose just vents into the engine compartment and not into a canister. So it appears I don’t have the original gas tank or vapor canister. 

    The previous owner did this to prevent vapor lock.   

    So after I install the new tank, it sounds like I can run one vent into a canister. I don’t think you can buy a replacement canister.   So can someone give me some greater details on how to build a canister?   I thought I would mount it in the engine bay.

    Thanks.
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    Offline plumcrazzy

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    Re: Hose route for the gas tank vapor container
    « Reply #9 on: April 13, 2014 - 08:25:01 PM »
    Are you guys referring to the tank vent or the fuel return line? My '70 440 Six-Pack has a vapor extractor below the fuel pump that is supposed to help prevent vapor lock. This canister used to be available aftermarket (Year One I think). :burnout:
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    Offline jmkdopkins

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    Re: Hose route for the gas tank vapor container
    « Reply #10 on: April 13, 2014 - 08:50:15 PM »
    Thanks.  Year One does have vapor separators that mount between the fuel pump and carburetor for 440's, but I am talking about a vapor canister that the tank vents into.

    I just saw another thread on this site, and it sounds like I could just plug all the tank vents and get a venting gas cap.  If that works, that is a much easier solution. 

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    Offline 72cudamaan

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    Re: Hose route for the gas tank vapor container
    « Reply #11 on: April 13, 2014 - 09:35:25 PM »
    Quote from: jmkdopkins on April 13, 2014 - 08:12:37 PM
    I need to replace the leaking gas tank on my 1973 Cuda 340.  My new replacement tank will have the 4 vents on the front of the tank. But looking at my car, the old tank has 1 vent on the side of the tank and its hose runs into the engine compartment. The hose just vents into the engine compartment and not into a canister. So it appears I don’t have the original gas tank or vapor canister. 

    The previous owner did this to prevent vapor lock.   

    So after I install the new tank, it sounds like I can run one vent into a canister. I don’t think you can buy a replacement canister.   So can someone give me some greater details on how to build a canister?   I thought I would mount it in the engine bay.

    Thanks.

    That won't do anything to change vapor lock. The vapor separator with a return line does that.  Just sayin  :bigsmile:
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    Andy  (phukker whither)

    Offline 72cudamaan

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    Re: Hose route for the gas tank vapor container
    « Reply #12 on: April 13, 2014 - 09:38:26 PM »
    If you want one, you can find the vapor canisters on ebay most of the time. I don't now with certainty if a
    vented gas cap will produce the same results or not.
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    Andy  (phukker whither)

    Offline jmkdopkins

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    Re: Hose route for the gas tank vapor container
    « Reply #13 on: April 14, 2014 - 05:34:59 PM »
    Thanks guys for the responses.  I will start looking on eBay for a vapor canister. 

    In the meantime, I think I will use a vented gas cap.  My understanding is that a vented gas cap will allow air into the tank.  Now the car runs great now, but I don't like my current set-up of a venting into the engine bay with nothing on the end of the hose.  So I am hoping the vented gas cap will work.
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    Offline Chlngrcrzy

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    Re: Hose route for the gas tank vapor container
    « Reply #14 on: April 14, 2014 - 10:13:06 PM »
    I found my old canister and the mounting ring. Where exactly is it mounted and where can i find that plastic vent that goes on the end of the vent hose? There are 3 lines going to the canister, i assume 1 is from the tank, 1 is the vent line and the 3rd is ?
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