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Gas tank sending unit

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 45acp, Feb 10, 2001.

  1. 45acp

    45acp 1/2 ton status

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    I am replacing the sending unit for my 83 Jimmy and would like to know what the function is for the 4 outlets. One is the fuel line to the fuel pump and one is the overflow return line. They are all different sizes. What are the functions of the other two? I assume that they go back to the vapor canister but is the function only to equalize the fuel tank pressure?
     
  2. FWP

    FWP CRS

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    That's right. 4 lines, fuel pump supply, fuel pump return, canister (activated carbon)vent, and gas fill tube vent.

    [​IMG]
     
  3. 45acp

    45acp 1/2 ton status

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    FWP, Thanks for the help.
     
  4. TX Mudder

    TX Mudder 1/2 ton status

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    You guys kept all that emissions stuff on there?
    I capped the extra lines and have a fuel out and a vent, that's it.
    -- Mike
     
  5. 45acp

    45acp 1/2 ton status

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    Thanks Mike (see my email)
     

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