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  1. #1
    Member
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    Dec 2019
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    Sisters Oregon
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    72 T fuel lines

    HELP please, my 72 has been banished from the garage! Living in Oregon this is not a good thing. The car stinks to high heaven of gasoline.
    I have replaced every line in the trunk and plugged the two lines going to the missing carbon canister.
    This is a weber car and everything from the tunnel rearward has been checked, no leaks
    I have found wet spots at the holes (vents?) in the tunnel. Definitely gas. Is there a way to determine if the steel lines have been compromised somehow?
    It doesn't appear to be an easy job to pull those and replace.
    I live in a high crime area and don't want my baby exposed to them or the weather.
    any suggestions would be appreciated
    thanks in advance.

  2. #2
    Senior Member NorthernThrux's Avatar
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    Easiest thing to do is connect the two hoses in the frunk together (the ones going to/from the charcoal canister) with a barbed connector, assuming those two lines are OK. Then you need to pressurize one of the two metal lines that come out of the rear tunnel and keep the other one blocked. If you pressurize with air, it should hold at whatever pressure you pump to (say 10 psi - these are not meant to be high pressure). If you can't pressurize with air, then add a 5 ft clear hose to one of those lines, run water through that clear hose until it is coming out the other metal pipe and then block that metal pipe. Mark the level of the water in the clear hose after taping it to the car somewhere high. See if the water level drops and where the water goes. Just blow the lines out with good old lung pressure or a compressor when you are done with this experiment.

    Ravi

    EDIT: Relevant to the charcoal canister vent lines only. I got distracted by the charcoal canister comment!
    Last edited by NorthernThrux; 03-28-2020 at 05:32 AM.
    Early 911S Registry # 2395
    1973 Porsche 911S in ivory white 5sp MT
    2015 Porsche Macan S in agate grey 7sp PDK

  3. #3
    member #1515
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    Have you checked the fuel lines at the bottom of the tank?
    David

    '73 S Targa #0830 2.7 MFI rebuilt to RS specs

  4. #4
    You probably know this but as far as I know all the fuel lines in the tunnel are hard metal lines and sect urged in place with no movement ...believe all the connection points are outside the tunnel.
    Checking at fuel tank soft lines to The hard lines at front tunnel is good start .
    Is your fuel pump in front or rear ?
    73.5 Snrf T
    71 Snrf T
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  5. #5
    Often the fuel line in the tunnel is damaged by someone carelessly running a tap or too long of a seat rail bolt into the seat rail mounting holes on the driver side, since that is the side the fuel lines are on. Take out the shifter assembly and see if you can get a better indication of fuel in the tunnel.
    Early S Registry member #90
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  6. #6
    Senior Member NorthernThrux's Avatar
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    Are we talking fuel lines or fuel vapour vent lines here? The charcoal canister may have been a red herring. I assumed the two steel vent lines for the canister. But duh, those wouldn't be leaking fuel. They would give rise to a smell though if damaged.
    Early 911S Registry # 2395
    1973 Porsche 911S in ivory white 5sp MT
    2015 Porsche Macan S in agate grey 7sp PDK

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