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Q-JET VACUUM LINES?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CAROLINAK5, Aug 17, 2001.

  1. CAROLINAK5

    CAROLINAK5 1/2 ton status

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    as stated in an earlier post, i'm going to install the q-jet that i received with the blazer, the problem is i don't know how to hook up the vacuum lines on the rochester...i've never put a q-jet on. there seems to be two ports under the fuel-inlet port and one large port on the backside of the carb.
    any input would be helpful and much cheaper than taking this to a garage. none of my buds are sure about this installation, as they all run Holleys 1/8 of a mile at a time! also, can i install a manual or electric choke in place of the manifold choke?
     
  2. xnoahx

    xnoahx 1/2 ton status

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    well, the big port on the back if for your power brake booster, and the two on the front are for vaccum advance on the distributor and for A PCV system. that is, if one is bigger than the other. the bigger one would be the PCV

    Check out my 73 K5 <a target="_blank" href=http://members.theglobe.com/xnoahx/73k5.htm>http://members.theglobe.com/xnoahx/73k5.htm</a>
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    Hook up brakes and PCV, (obvious due to their size) and the vacuum break (passenger side front, comes down at 45 degree angle into the vacuum diaphram) and cap the rest. Once you get it started, then you can play with the ports. Typically drivers side, front, middle section of carb is for vac. advance, one other is going to be EGR. Neither should have vacuum when the vehicle is at hot idle.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     

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