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another set of questions (fuel lines and tranny cooler lines)

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by solowookie, Sep 13, 2001.

  1. solowookie

    solowookie 1/2 ton status

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    OK... these shoud be pretty basic, but I can't find the answeres in my manual...

    I know there is a return fuel line, and a line from the fuel tank... which line is the return line??? (left or right side of the TBI)

    same question about the tranny cooler lines... is top or bottum the return line??? (I'm assuming top is the return line)

    also if I am hooking up the tranny cooler lines backwards it will go into the radiator first, and then to the tranny cooler correct???

    <font color=blue> Jeff - may the force be with you</font color=blue>
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  2. outlaw612

    outlaw612 1/2 ton status

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    Im not sure about the fuel lines, but there was a post on here earlier about a trans cooler and someone posted and said the top is the line to the radiator and the bottom line is the return.

    <a target="_blank" href=http://www.geocities.com/outlaw613/K5.html>http://www.geocities.com/outlaw613/K5.html</a>
     
  3. Itali83

    Itali83 1/2 ton status

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    the return line is the smaller of the two braided fuel lines coming from the tank. I don't knwo what they look like on the TBI side, but you can at least trace them. ANd for the tranny cooler lines, they are all different, when I hooked up my cooler, people said both were the feed and return, I had to crack a line, crank the motor, and have a friend look at the oil to see where it comes from. and also, you WANT to rout the tranny cooler like this, from tranny, to radiator cooler, then to the external cooler back to the tranny. Because the water in the radiator will be around 150-180ish and that would be as cool as the oil would get, but if it goes from there, to another cooler, it will get cooler. Make sence? Hope I helped.
    Ben 87 Jimmy
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  4. Itali83

    Itali83 1/2 ton status

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    See, my radiator was the opposite, my top one was the return line, looks like you gotta crack one and make a mess!!!!!
    ben 87 Jimmy
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  5. gokartergo

    gokartergo 3/4 ton status Staff Member Moderator

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    On the 700R4 the top one is the return.. I believe it was the oppiste on the th350...I just installed mine a couple of weeks ago....Dan

    If it ain't broke.......Don't fix it....
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  6. chevyfumes

    chevyfumes Court jester

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    Watch for the muzzleflash!
    What happens if you hook up the th350 backwards[​IMG]

    <font color=blue> I'd rather have a bottle in front of me, than a frontal lobotomy!
     
  7. gokartergo

    gokartergo 3/4 ton status Staff Member Moderator

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    It would flow threw the tranny cooler first and then threw the rad. Would not cool as good as it could. It actually could raise the temp back up to what ever the water temp is at...Dan

    If it ain't broke.......Don't fix it....
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