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Brass Floats

Discussion in 'The Mixing shop.' started by sbbuick, Feb 20, 2006.

  1. sbbuick

    sbbuick My driving scares people!

    How about a new one?

    Has anyone had problems with brass carb floats? I know that the nitrophyll (plastic) floats can eventually absorb fuel, but I was under the impression that brass floats can last for decades. Has anyone had a brass float develop a pinhole leak after years of service?

    Thanks!
     
    sbbuick, Feb 20, 2006
    #1
  2. DaWildcat

    DaWildcat Platinum Level Contributor

    I've never heard of trouble with brass floats & pump gas, but I've seen that with high percentage alcohol blends that brass (and perhaps the solder used on the brass floats) isn't recommended for fuel systems use. I'd guess long-term durability with high alcohol percentages might be a problem.

    Devon
    (fuel & brake systems engineer, for what it's worth!)
     
    DaWildcat, Feb 20, 2006
    #2
  3. sbbuick

    sbbuick My driving scares people!


    Thanks, Devon.
    That's what I was thinking. The problem is that I have a very hard time keeping the fuel under control with my 750 double pumper holley. Hard cornering and braking makes it tend to flood me out. I went back to a Q jet and the problem is gone, but I miss the HP and electric shoke the Holley has. I am thinking I may need more fuel control pieces like the vent "whistle" and possibly jet extensions. Holly told me it it likely the float, but They don't appear to be leaking.
    Dunno.
     
    sbbuick, Feb 20, 2006
    #3
  4. RAbarrett

    RAbarrett Well-Known Member

    The problem here may not be the float, but the position. You recall that the Holley has end mounted floats, increasing the effects of gravity on the floats. The Q jet has center located floats, lessening the g forces' effects. Ray
     
    RAbarrett, Feb 20, 2006
    #4
  5. carbking

    carbking carburetion specialist

    Brass floats can develop leaks over time. The good news is they are generally repairable. To test a brass float, simply submerge the float in hot water. If there is a leak, the hole will blow a stream of air bubbles (the hot water pressurizes the air).

    We have a page on our website that explains how to repair these floats, but not sure if it is within this forums etiquette to link to a commercial site.

    Jon.
     
    carbking, Feb 21, 2006
    #5
  6. pooods

    pooods Well-Known Member

    I have had a couple of brass floats over the years get a pin hole in them. I simply took them out and shook them. I could hear gas moving around inside. One would actually sink in the gas after letting it sit in a filled carb for a short while.
     
    pooods, Feb 21, 2006
    #6
  7. sbbuick

    sbbuick My driving scares people!

    Ok. Thank you!

    That is what I was wondering. I'll go ahead and change them out. The thing that bums me out is how the Holleys just don't seem to control the fuel nearly as well as the Q Jets do. :(
     
    sbbuick, Feb 21, 2006
    #7

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