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09-01-2019, 10:22 AM | #1 |
Senior Member
Join Date: Jan 2019
Location: Chicago
Posts: 732
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Carb Deterioration
Follow-up: A few weeks ago I posted that I suddenly could not get my built flathead with a Holley to idle. Only way to keep it running was to keep pumping the accelerator pump. I assumed the carb idle circuit was blocked. I finally got time to rebuild the carb, and I think I now know how it got blocked.
Appears the carb's white metal casting is being eaten away, introducing a granular waste product into the gasoline. What do you guys know / think about this phenomena? See pics. attached. First pic shows initial find, a pasty substance in the float bowl. Second pic shows it after gasoline has evaporated, leaving a granular residue behind. Third pic shows the metal deterioration. A Chemical-knowledgeable friend speculates that it's caused by the ethanol in today's gas holding H2O. Would be especially hard on a car that sits for long periods, allowing gas in carb to evaporate. My car has that history with the previous owner. |
09-01-2019, 11:07 AM | #2 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,950
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Re: Carb Deterioration
What you suggest makes sense. I too run a Holley 390.
Before filling up add some STABIL and Marvel Mystery Oil. I found that to help when a car sits for a month or two or longer. Very important to start you car and let it reach operating temp. at least once a week. Is there a place near you that sells non-ethanol gas? |
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09-01-2019, 11:41 AM | #3 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: Carb Deterioration
Ethanol
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09-01-2019, 12:48 PM | #4 |
Senior Member
Join Date: Jul 2014
Location: Iowa
Posts: 1,634
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Re: Carb Deterioration
I agree, Today, there is ethanol in all gas, even when the pump says not. Gas pumps usually handle several grades, and if the user ahead used gasohol, what ever remained in the pump and hose goes into your vehicle first. The published switch to E-15 (15%) alcohol will make the problem worse. It is highly corrosive to systems later than the year 2000. Any preventive additives simply dilute the fuel.
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09-01-2019, 02:23 PM | #5 |
Senior Member
Join Date: Apr 2018
Location: Chelmsford, ON Canada
Posts: 529
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Re: Carb Deterioration
One fellow in our club had the same concern about cross contamination at the pump, so he takes a 2 gallon (lawn mower) can with him when he fills his 'stock '48. He fills the 2 gallon, then fills up the car.
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09-01-2019, 09:52 PM | #6 |
Member Emeritus
Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: Carb Deterioration
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