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Gas tank sender question

Discussion in 'The Garage' started by bigwalleye, Oct 10, 2005.

  1. bigwalleye

    bigwalleye Registered Member

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    I got a 76 blazer with a 350, th350 tranny, 205 t-case, quadjet carb. I purchased a new tank and sender. I noticed that a manuel tranny has 3 outputs on the sender and a auto has a 4 output senders. I am confused what the 4th output is for.

    1-Fuel output tube
    2 - filler overfill tube
    3 - tank back persure tube
    4 - ??? :confused: :confused: :confused:

    On my current setup the 4th sender output was capped, just trying to figure out what it should be going to.

    http://www.carpartswholesale.com/store/index.php?cat=67&year=1976&make=CHEVROLET&model=BLAZER

    [​IMG][/IMG]
    SENDING UNIT
    Notes: 4 Outlets, 25 Gal., A/T, w/O-Ring & Strainer, (FG12D)
    Part Number: G670319
    OEM Number: 0
    List Price: $98.25
    Sale Price: $49.95
     
  2. mechted

    mechted 1 ton status Premium Member

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    i believe its a vent line (ie plug it or run a line somewhere up high on the body)
     
  3. bigwalleye

    bigwalleye Registered Member

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    Its odd if it is a vent line it is just designated for an auto. A vent line was my first guess also. Could it be a smog thing?
     
  4. mechted

    mechted 1 ton status Premium Member

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    i dont think so, my 73 has the same thing... they had very limited smog equipment back then
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    Fittings on the sender would be: (if every one ever put on was in place)

    Fuel out
    Fuel Return
    EVAP or Breather
    Fill neck vent

    Return is not always there, and if they ran a vented cap early enough, a vent on the tank would have been unnecessary as well. Emissions setup was very much based on final sale location, chassis, and drivetrain combo.
     

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