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11-08-2023, 10:44 AM | #1 |
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Join Date: Aug 2014
Location: Rhinebeck, NY
Posts: 762
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'53 Holly Carburetor Troubles
I have a holly carb that has been rebuilt by a reputable man who is 50 yrs in the business. The carburetor seems to loose its prime when sitting for a few days. Sometimes it seems to do this when only sitting for a few hours. Plugs have been changed and gapped to .030. Is this problem normal for holly carbs? Should I be looking at a new carburetor or keep the rebuilt?
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11-08-2023, 11:34 AM | #2 |
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Join Date: Jul 2010
Location: Conifer, Colorado
Posts: 2,429
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Re: '53 Holly Carburetor Troubles
Keep the carb, that is normal to a degree. The engine gets hot enough to boil the fuel out of the float bowel, once the car is turned off. Usually I find I can go a coupe of days and there will still be sufficient gas in the carb to start the car. I think the factory fuel pump is a bit weak, so it take numerous cycles before tit will sufficiently replace the gas in the float bowel to start the car. Hence one of the two reasons I have a flow through electric fuel pump too. I can flip on the switch to the electric pump and it will l refill the float bowel, so I can start the car on the first or second revolution of the engine. The second reason to have a flow through electric pump is to clear vapor lock.
Bottom line the problem is not the carb but heat and the lower boiling point of modern day fuels. And that's my opinion, based on my personal experience and it is free. Take it for what's its't worth. |
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11-08-2023, 02:54 PM | #3 |
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Join Date: Aug 2014
Location: Rhinebeck, NY
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Re: '53 Holly Carburetor Troubles
Thanks for the reply. I will keep the carbureter.
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11-08-2023, 06:14 PM | #4 |
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,320
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Re: '53 Holly Carburetor Troubles
While I agree that this may be normal, I would check to see if the power valve wasn't leaking. Bad gaskets or the wrong PV can do this. I would remove the carburetor from the car, and remove the top of the carb. Then, place it in a pan and fill the float chamber with gas and put something on top of it (paper towel?) to inhibit evaporation. Let it sit overnight and check it in the morning. If the level is significantly lower, you have a problem. Either the gasket is bad and needs to be replaced, or you may have the wrong power valve. PV's for latter Holley 4-BBL's look almost the same and will even screw into the float bowl, but the seating method is different from the earlier units. Make sure you have the correct PV.
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11-08-2023, 08:45 PM | #5 |
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Join Date: Aug 2014
Location: Rhinebeck, NY
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Re: '53 Holly Carburetor Troubles
The man who rebuilt the carburetor has been in business in Poughkeepsie for more than 50 years and is well regarded. I did use the old gasket, so I will use the new gasket that came with the rebuild. Thanks for the tip.
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11-11-2023, 05:31 AM | #6 |
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Join Date: May 2010
Location: South Texas
Posts: 1,631
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Re: '53 Holly Carburetor Troubles
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The 1/4 inch was determined by trial and error with a Stromberg 97 carburetor where you can see the fuel level with the top off. Setting the float this way resulted in fuel level where it would be with non-ethanol gas and a stock float level. |
11-12-2023, 01:03 PM | #7 |
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Join Date: Mar 2013
Location: Green Bay Wi
Posts: 400
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Re: '53 Holly Carburetor Troubles
I eliminated my problem by doing away with any fuel containing ethanol worst thing you can do is use that fuel in anything with a carb
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