489 cui Hemi stalls after a few seconds in idle

Fuel and Air Systems

  1. Moparjack 489

    Moparjack 489 FBBO Gold Member FBBO Gold Member

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    It’s the front carb leak . The back one have no issue .

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  2. BB BELLA

    BB BELLA Well-Known Member

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    i would remove the carb assemble it and then check if you can blow in there while somebody squeezes 5psi out of you! this way you know nothing is hanging the float when it's assembled!other than that has to be a crack in the casting!
     
  3. Moparjack 489

    Moparjack 489 FBBO Gold Member FBBO Gold Member

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    I will make a video tomorrow where you can see the fuel come out of the small sheet cover who holds the metering inside of the driver side , and also on the passenger side on the flap linkage of the secondary s
     
  4. myk r sanchez

    myk r sanchez Well-Known Member

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    Why did you change accelerator pumps?
     
  5. khryslerkid

    khryslerkid FBBO Gold Member FBBO Gold Member

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    The blue ones that come with the rebuild kits won't last very long especially with 10% ethanol. The engine wasn't idling right not long after rebuilding the carbs and watching the squirters, they were inconsistent. Read on here that the change to the vitron was the answer. Definitely did the trick, going on two years now.

    Back in the 80s Chrysler had a recall on accelerator pumps for the same reason.
     
  6. khryslerkid

    khryslerkid FBBO Gold Member FBBO Gold Member

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  7. myk r sanchez

    myk r sanchez Well-Known Member

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    I ask because I've always wanted to try a different pump on my edelbrock 1411; I wanted to see if I could get a pump rated at a higher discharge than the stock one...
     
  8. Moparjack 489

    Moparjack 489 FBBO Gold Member FBBO Gold Member

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    Thanks , I know this video . Exactly so it looks on my one, the fuel came out on the vents.
    But I not have any dirt in the needle and seats , and if I turn the top with the floats and everything installed on the head and blow with my mouth air in the inline fuel line the needle and seats are fully seal, I not can blow any air inside . Float level is also adjust on 7/16”
     
  9. Moparjack 489

    Moparjack 489 FBBO Gold Member FBBO Gold Member

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    With 1407 and 1411 you have to use the 1467 part number . There are also available 1468 and the blue 1470 plunger , but these two plungers for other edelbrock models

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  10. khryslerkid

    khryslerkid FBBO Gold Member FBBO Gold Member

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    That's mainly done with the position of the linkage on the pump's arm as to which of the three holes you have it in. The other way can be with the size of the squirter. The spring on the accelerator pump has a bearing on the shot also and I believe the vitron ones do have a stiffer spring. It's been awhile since I've researched this.
     
  11. khryslerkid

    khryslerkid FBBO Gold Member FBBO Gold Member

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    Only thing I can say is that when you put it back together you are getting another piece of dirt under the needle again.

    Or the needle is worn just enough to seal one time and not again. Maybe you can't blow 5 lbs of pressure? Try another needle and seat and see what happens.

    Just make sure that float is not taking on fuel. As soon as you remove it dry it off and look for wet fuel around the seams where it's been soldered.

    Good Luck!
     
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    • Moparjack 489

      Moparjack 489 FBBO Gold Member FBBO Gold Member

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      Thanks you all!!! It’s fixed!
      Crazy you right one float was 3/4 full with fuel , that’s the reason why they problem starts slowly and day by day the idling and stoping on red light s goes more bad. Because the one float goes heavy and heavier each day and more fuel running out.
      Yesterday I not regonize that one float have fuel inside because the float are full try on still now when you removing the float and shake it and move it in all sides no fuel comes out of it . Crazy how it can cones in better never out again ???? Self sealing hole ot what ? Crazy
       
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      • khryslerkid

        khryslerkid FBBO Gold Member FBBO Gold Member

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        Cool Deal Jack!

        Check your oil in the crankcase for fuel.
         
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        • Moparjack 489

          Moparjack 489 FBBO Gold Member FBBO Gold Member

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          I think is ok , no special fuel smelling on the oil if I check on the oil level dip stick. And also no higher level . Or you prefer a motor oil change ?
           
        • 33 IMP

          33 IMP Well-Known Member

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          If it was my hemi, I'd change the oil. Once it's out, you can get a better look at it, and either save for re-use if it's ok, or use in something else. We have a saying, "better safe than sorry".
          Edit: glad to hear you have solved it .
           
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          • BB BELLA

            BB BELLA Well-Known Member

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            "crazy I right" never heard that from a german before Asians all the time!
            Do the oil change whether you think it needs it or not! I don't want to here "crazy I right", again!
             
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            • tommytunes

              tommytunes Member

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              Change accelerator pump and floats ! Seam on the float could be sucking in fuel causing the problem.
              While your at it change fuel filter too.
               
            • AJ/FormS

              AJ/FormS Well-Known Member

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              A float with a hole below the liquid level in the bowl breathes with temperature change. As you drive, the fuel warms and the float with it. The air inside the float expands and escapes.
              After shut-down, when the fuel cools, and the float with it, the air inside contracts, and since the hole is below the liquid level, the fuel moves into the float. Now it it is heavy. Next time you drive, it repeats. and the float gets heavier still. and so on.

              To get the fuel out, you have to heat the float. If you use flame you have more courage than I do, but the hole should show up right away.lol.
              I use a hair dryer or sunshine. But finding the hole is a little harder.
              And re-soldering it is also very tricky. I made a mess of a few floats before I gave up, and just daubed the hole with a two-part epoxy.If you get the float hot and then sealed, then it collapses as it cools.
               
              Last edited: Apr 15, 2020
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              • Moparjack 489

                Moparjack 489 FBBO Gold Member FBBO Gold Member

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                Very interesting , and now makes sense for me it’s start a up with very small amount of fuel out of the carburator and each drive ( day) goes more and more fuel out , and the idling ot stoping on a red light goes to be a war with gas and brake pedal to keep the engine running !
                Thanks so much , I take one float of my other 750 Edelbrock , and now will order some spare just in case
                 
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