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Thread: Fuel System Question

  1. #1
    Junior Member
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    Fuel System Question

    Hey all,
    Finally got my '73T running and its a hoot. Filled it up for the first time and it wreaks of gas. No leaks seen. I just gotta ask; is there any upgrade from the 70's era system that would eliminate the smell and even improve on the delivery of fuel to the engine. FYI all hoses were replaced and it's hooked up the right way, cap gasket is new...I read some other posts and the diagram of the existing system the forum provided was excellent.
    Thanks

  2. #2
    Senior Member
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    How's the cork gasket for the fuel level sending unit ? Is the fuel evaporation canister in front of the oil gauge cracked ?

  3. #3
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    Hey,
    Sorry had to leave town...All the lines are new, the tank was boiled out and put back together with new gaskets, even the fuel cap. The canister will now be replaced.
    Thank You for the information.

  4. #4
    Member AKAMick's Avatar
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    Sounds like a smoke test would reveal the source of the fumes quite well.
    Current fleet, mostly rubbish automobiles and other assorted junk.

  5. #5
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    just how do you do a smoke test?

  6. #6
    Member AKAMick's Avatar
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    Quote Originally Posted by patjolson View Post
    just how do you do a smoke test?
    The test fills the fuel and Evap system with smoke and the leak becomes visible as smoke at the source of the leak, https://www.ebay.com/itm/Automotive-...3fc0b3c219eb1c
    Current fleet, mostly rubbish automobiles and other assorted junk.

  7. #7
    Washers on the sending unit screws are aluminum and do "crush".
    Early S Registry #235
    rgruppe #111

  8. #8
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    What shape is you evaporative emissions system in? I would think this is the most likely area for fuel smell. Many times the vapor tank (3) in the right front fender is cracked. This gets fuel when filling the tank and then return the overflow to the tank from the bottom fitting, while the hose at the top circulates the fumes through the charcoal canister to the air box.
    Name:  Vapor001.jpg
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    The 2 lines in the lower left go to the fan shroud and the air intake box.
    Parts 32 and 33 are not part of it, they are the overflow of the brake fluid reservoir.
    Last edited by ESully; 04-06-2020 at 04:04 AM.
    E Sully
    1973.5 911T

  9. #9
    Senior Member NorthernThrux's Avatar
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    The under cowl box (2) also is prone to cracking, as are the Y connectors (11, 12). Basically any plastic exposed to fuel vapours for that long tends to fail. All are still available as reproductions.

    Ravi
    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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