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return line question

Discussion in 'The Injection Section' started by leadfoot067, Jul 9, 2006.

  1. leadfoot067

    leadfoot067 1/2 ton status

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    im injecting my 73 K5 and i need to run a return line...i noticed the factory vent line is there can i use it? has anybody used it for return?

    thanks
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    I would run a new return line and leave the vent line hooked up or you run the chance of imploding the gas tank (sucking in).
     
  3. sweetk30

    sweetk30 professional hooker Premium Member

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    could swap in a newer sender unit with return in it.
     
  4. 1979jimmy350

    1979jimmy350 1/2 ton status

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    i ran mine to the vent line hole, that line is only for the carocle canister the tank is still vented through the cap if it is the older style. Or you can run a t- fitting in the filler tube to put a return line in if you want to keep the canister
     
  5. leadfoot067

    leadfoot067 1/2 ton status

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    ya the cannister line is the one im speaking of....mine hasnt had a cannister since ive owned it....as i do more reading into the subject it seems most return lines are 5/16...so mabe it will work...iwas simply trying to avoid running more lines....
     
  6. mouse

    mouse 1/2 ton status

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    On my '77 the original return line (or charcoal canister line) was much smaller than the factory TBI return line so I changed it out to the factory TBI line. The old one couldn't flow enough.
     
  7. HarryH3

    HarryH3 1 ton status Author

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    When I added the line on my '75, I just ran a new line and drilled a new hole in the sender plate. If there's room, you could use a bulkhead fitting, but I just had a buddy TIG weld mine in place.
     

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