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Old 10-05-2002, 06:40 PM
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Post Bubbling carburater

I have a new Holly 600CFM on a SBC 400. I am trying to get it started for the first time. The problem is the secondary tube has fuel bubbling out of the top of the tube. The engine started, but I shut it down . I prefer to have the fuel in the carb, not all over the engine. Can any one help?

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Old 10-05-2002, 07:04 PM
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I have 3 of this brand carb, but none of mine have this secondary tube you mention. I have a detailed service book, if you give me the model number off the carb I will look it up for you.
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Old 10-05-2002, 07:07 PM
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If your gas is coming out of the vent tube at the top of the carb you could just have a sticky rear float. You could try dropping the float adjustment but you will probably have to pull her apart and check the needle and seat assembly.
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Old 10-06-2002, 12:01 AM
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And if its what dmorris sed you should also look very carefully those little o rings that are sealing neadle seat to carb body.(have fighted pretty long because of that. fuel level didnt stay where i set it )
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Old 10-06-2002, 07:59 AM
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[quote]Originally posted by HotRodMan:
<strong>I have 3 of this brand carb, but none of mine have this secondary tube you mention. I have a detailed service book, if you give me the model number off the carb I will look it up for you.</strong><hr></blockquote>

The model # is a 4776-5. Does this help?
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Old 10-06-2002, 08:06 AM
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The model # is 4776-5 and the Data # is 2939. This carb is new out of the box, never run. I really doubt the float is sticking. Worth a try though
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Old 10-06-2002, 10:20 AM
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I thought also that new carb wont need any repairs. thats why it took me so long to find that leaking o ring in my last holley.
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Old 10-06-2002, 10:27 AM
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Sometimes the floats stick and the carb needs a little tap with the handle of a screwdriver to rattle them loose, it's happened to me a couple of times. Doesn't hurt to give it a try before you tear into the carb. Seems when the float is at it's lowest on an empty bowl they can stick slightly to the bottom of the bowl. Then again your needle and seat is leaking or the pivot pin for the float was put in backwards and has worked it's way out.
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Old 10-06-2002, 10:50 AM
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The message I am getting is just because it is new dosen't mean it won't stick. I'll give it a try and see what happens. The info is great from all of you and I appreciate it !!!
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Old 10-06-2002, 12:19 PM
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Alright guy's it worked. It is a sham to spend that kind of money and you have to hit it to make it work. Anyway the engine sounds goooooood. Thanks for your info. Jim
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