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Liquifire carburator question.

General Vintage Discussion

 
 
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  #1  
Old 11-30-2008
afzimm
440 LIQUIFIRE
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Default Liquifire carburator question.

Hi Guys- I,m new to the site. I have been reading alot of posts the past few days and there;s a ton of info being exchanged here. I just bought a 1982 or 83 JD Liquifire 440. I have spent the last week cleaning it up, seat off, cleaned out gas tank, took carbs off and cleaned, etc etc. Yesterday I got it all put back together and started it up. Here's my question. There is a tube hanging down along each mikuni carb, when I start the sled, gasoline pours out of these 2 tubes. I'm asssuming there should be a return line back to the tank. Is there a Y tube available to send the two tubes into one and then back to the tank Thanks in advance AZ
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  #2  
Old 11-30-2008
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sounds like the vent tubes. chances are the carbs need a good cleaning.

where is browntown mn?
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  #3  
Old 11-30-2008
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440 LIQUIFIRE
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It's 1 hour west of Minneapolis.
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  #4  
Old 11-30-2008
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hmm, never heard of it.

good old liquifire, i have a trial fire for a project sled in a couple years but its just not the same as the liquifire.
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  #5  
Old 11-30-2008
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AFZimm-

Those tubes are the vent/overflow lines. Take the carbs off, take the 4 screws off the bottom of the bowl, and start cleaning. You have at least one of the following problems:

-Stuck floats (When you pop the bowl off you'll see them - black and round - like small hockey pucks
-Gas-logged floats
-Stuck needle and seat (stuck open)

All of these conditions allow the fuel pump to constantly pump fuel into the fuel bowl - and since you're not using all the fuel being pumped in, it dumpes it out the vent lines.

While you have them apart, make sure you clean everything. Take every jet out, every pin, eveyr screw, the enricheners, etc and CLEAN everything with carb n chocke cleaner, q-tips, toothbrushes and small pieces of wire.

Here's a lot of info on your carbs:

http://www.slednutz.com/showthread.p...=mikuni+manual
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  #6  
Old 11-30-2008
afzimm
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Hey Cuz, I think you are right on, I will clean the carbs. OK so there is a return fuel line going back to the tank, it's busted off below the carbs so I don't know where is came from, but winds it's way back to the tank, where the heck does this originate?
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  #7  
Old 11-30-2008
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Got a picture?
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  #8  
Old 12-07-2008
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No return lines going back to the tank.

Im wondering if he is talking about the sediment traps under the bowls. If they are cracked, broken they will dump gas out.
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  #9  
Old 12-07-2008
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The old sleds didn't have sediment traps.
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  #10  
Old 12-07-2008
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Then again, maybe someone put a newer carb on it.
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  #11  
Old 12-07-2008
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no fuel return on a JD. Fuel out of the tank to the fuel pump then one line to vacume on the engine block and 2 lines out of the pump 1 to each carb. Depending on year 1 or 2 small lines hanging off the carbs for overflow vents, in case the needle will not close off the fuel flow it spills into the engine compartment to evaporate. Floats not floating or dirt stopping the needle from sealing. find which one is your problem. you may not find anything and will have to change the needle and seat to new ones. If your floats are brass, check that there is no liquid in it.
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Last edited by blue avenger : 12-07-2008 at 03:02 PM. Reason: spelling, where is speeelll cheker
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  #12  
Old 02-02-2009
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Definately no return lines. As the others have stated you have a stuck float or bad needle and seat. Both common on an old John Deere. Real common for mice to get in the air box on a Deere and piss into the carbs. Plays havoc on everything. I usually soak my carbs overnight in the Carb cleaning solution cans before going through everything.
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  #13  
Old 02-03-2009
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If the lines come out of the upper part of the bowl section, they are overflow lines. (usually two of them on each carb)
If the lines are hanging from the bottom of the bowl, they are sediment traps.
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