Author Topic: Carb Drips Gas from Air Intake  (Read 401 times)

frankp

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Carb Drips Gas from Air Intake
« on: June 06, 2018, 01:43:36 AM »
Hi folks,

Anyone have this problem on a Carter RT-08 and solved it?  I'm stumped.  Leaks even with gas shut from vac tank.

Unfortunately Jon, Carb Shop, says this is what they do, but doesn't seem right.  Never a dull moment.

Thanks for any input,
frank
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chetbrz

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Re: Carb Drips Gas from Air Intake
« Reply #1 on: June 06, 2018, 03:51:42 AM »
Iím thinking float valve.
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frankp

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Re: Carb Drips Gas from Air Intake
« Reply #2 on: June 06, 2018, 05:04:40 AM »
Interesting thought.  Would the gas be pushed back up through the strainer cap?  I have not remvoved the cap to watch.  The liquid volume decreases over time.  First thing to mind was some type of pressure differential, siphon?  I don't know all the internal plumbing.

Float seems intact.  Plexiglass bowl, anyone?

Doesn't leak when running.
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29plycoop

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Re: Carb Drips Gas from Air Intake
« Reply #3 on: June 06, 2018, 06:24:27 AM »
Frank: My 2 cents. If the float tank shutoff is working correctly and is in fact off, the only place gas could be coming from is the carb float bowel. On a few ocasions I have seen that a small piece of contamination in the needle and seat will make the situation you have. We had to take the carb apart and flush with all the jets out 3 times before getting it clean. Another posibility is the float may be set to high. Worth a second check if you have it apart. Good luck - Rich
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frankp

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Re: Carb Drips Gas from Air Intake
« Reply #4 on: June 06, 2018, 02:50:41 PM »
I'll disassemble, clean and check float and level again.  Pretty sure there is one jet that can't be removed.

Thanks Chet and Rich for your suggestions.  Probably a week or so before diving in.  I'll post results.
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frankp

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Re: Carb Drips Gas from Air Intake
« Reply #5 on: June 15, 2018, 07:06:35 PM »
After 2nd clean out, it only leaked about a teaspoon full over 24 hours.  A short 2 mile drive yesterday afternoon resulted in no overnight leak with the stopcock turned off on the vac tank.  I'm putting this in the win column, for the moment.  I have a rebuild kit on the way and may replace needle valve.  Rich, your advice appears to have worked - thank you and Chet for your input. 

frank
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29plycoop

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Re: Carb Drips Gas from Air Intake
« Reply #6 on: June 16, 2018, 03:47:04 AM »
Glad to hear she is up and going again. With some 90 year old parts they can be hard to get along with. Happy Motoring again.
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frankp

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Re: Carb Drips Gas from Air Intake
« Reply #7 on: June 25, 2018, 03:33:22 PM »
My success was short lived.  After installing a new needle assembly, not a drop for 4 days.
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chetbrz

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Re: Carb Drips Gas from Air Intake
« Reply #8 on: June 25, 2018, 10:51:28 PM »

Hopefully that will do it !

 
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