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01-23-2021, 08:04 AM | #1 |
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Dirty Carburetors
Dirty carburetors tend to be a frequent theme on this site. Many folks post about cleaning them out to get better performance.
I remember in the late 1970s and 1980s, Citgo gas tended to plug up carburetors in my area. (I’d have to use aerosol carb cleaner to cure hesitation in my cars back then fairly frequently. I switched to BP and Exxon, and I stopped having that particular problem so often. If I recall correctly, I think these are called top tier brands and are supposed to keep the carburetor cleaner.) Murphy (at our Walmart gas station) sells ethanol free gas, and I always add Marvel Mystery Oil when I fill up. So far, I’ve had my Model a for about a year and a half, and I don’t seem to have any carburetor issues. I suppose not having an air filter would allow the carb to suck up more dirt. (I know there has been a lot written about the virtues and perils of running or not running an air filter.) Was a dirty carburetor a common issue in the 1930s and 1940s? Have you noticed one brand or type of gas causing more issues than another? What are some ways to keep carburetors from getting dirty in the first place? Sent from my iPhone using Tapatalk |
01-23-2021, 08:26 AM | #2 |
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Re: Dirty Carburetors
I cleaned my carburetor last fall and at the same time cleaned all the jets and replaced the gaskets. The GAV was not up to the mark so I replaced that assembly. The carb was indeed dirty but I do not know when the last time was that it was cleaned either. TO me, cleaning the carb and jets "baselined" the carb for me. I also run my A with the engine pans.
Other member in my club do not run with air filters. I try to purchase Ethanol Free when and where I can get it. Compared to the 30s and 40s most roads are paved now....with the exception of the 600 yard long dirt road I live off of. :-) I am not expecting carb cleanliness to be a big issue. If I have to clean it once a year after driving less than 1000 miles...so be it. A labor of love. But I will report back at some point about how clean my carb remains. Planning, still on doing some driving at the MAFCA NH tour in June. |
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01-23-2021, 08:40 AM | #3 |
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Re: Dirty Carburetors
The key is to make sure you have all the proper filters installed.
Pencil filter in the tank, sediment bowl screen and filter and carb filter. With todays roads a carb air filter is probably not going to make much difference as far as filtering more particles. |
01-23-2021, 08:57 AM | #4 |
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Re: Dirty Carburetors
When you have those carburetors off to play with them, make sure that top flange is flat. Hit it with a large file to make sure.
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01-23-2021, 09:04 AM | #5 |
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Re: Dirty Carburetors
I totally agree with your assessment. Good common sense. Wayne
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01-23-2021, 09:07 AM | #6 |
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Re: Dirty Carburetors
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01-23-2021, 09:23 AM | #7 | |
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Re: Dirty Carburetors
Quote:
That’s an excellent point. I hadn’t consider that. Sent from my iPhone using Tapatalk |
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01-23-2021, 09:29 AM | #8 | |
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Dirty Carburetors
Quote:
I don’t know if there is a pencil filter in my tank or not, but I’ll probably need to replace my fuel shutoff and check on that filter when the weather gets warm. It’s starting to weep just a bit. I presume my glass sediment bowl has a screen. It seems to be collecting a little bit of dirt. There isn’t much in the bowl yet. I’ve heard they are prone to leaking; so, I’ll probably wait a while before I break it open. The previous owner installed a carburetor filter, and the filter does collect dirt. I’ve changed it once. Sent from my iPhone using Tapatalk |
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01-23-2021, 10:39 AM | #9 |
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Re: Dirty Carburetors
does anyone use an in line filter bettween sediment bowl and carb?
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01-23-2021, 11:15 AM | #10 | |
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Re: Dirty Carburetors
Quote:
Before you remove your sediment bowl, get a new cork gasket so you can replace it. Sometimes the gasket comes off partially stuck to the glass and rips, not much good then. Worth a buck to just plan to put a new one on. Put a towel, bowl or something underneath it to catch the fuel as you loosen the bail. And turn off the gas valve at the tank first (DAHIK)! JayJay
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01-23-2021, 11:30 AM | #11 |
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Re: Dirty Carburetors
I tried every bit of advice and was collapsing the "micro filter" inside the sediment bowl. Someone suggested that these motors get angry when over filtered. I tend to agree. To each his own but the best combination for my car has been the pencil filter and a wix brand #33039 inside the sediment bowl. That's it other than the useless (imho) filter inside the carb itself.
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01-23-2021, 11:39 AM | #12 |
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Re: Dirty Carburetors
I spent a lot of time in years past cleaning carburetors, carburetors of all sorts. I don't think its too much of an issue today.
It does seem to be a pretty big topic here though. Once a carburetor is properly cleaned and adjusted they should bullet-proof for along time. As for an 'A' carb, whatever type it is, I run different ones at different times just for the heck of it. An 'A' is an 'A', they don't much care. In mine I run all the old stale gas I have hanging around from the mowers, weedeaters, outboards, chainsaws, etc. It doesn't care. But, I do use non-ethanol in those engines. When I pull in to a station for fuel with the 'A' I use the cheap ethanol stuff, there isn't much that can hurt our carburetors. I'm one that uses an air filter and an in-line fuel filter. |
01-23-2021, 11:45 AM | #13 | |
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Re: Dirty Carburetors
Quote:
Really? I’ll need to check that out when my tank is low again. And, I’ll need to order a cork gasket. I recently ordered a replacement shutoff valve, a pencil filter, and some spare gas lines (in case I need something up when I eventually take it apart in warmer weather), but I didn’t think about the sediment bowl. Sent from my iPhone using Tapatalk |
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01-23-2021, 11:49 AM | #14 |
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Dirty Carburetors
Does a carburetor tend to get dirty (on its own, maybe with corrosion of some sort) if it’s just sitting for a few years? That might help explain the frequent topic—often the posts are related to awakening a Model A from a long “sleep.”
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01-23-2021, 12:06 PM | #15 | |
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Re: Dirty Carburetors
Quote:
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01-23-2021, 12:15 PM | #16 |
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Re: Dirty Carburetors
I bet dirty carbs were commonplace back in the day. With no air filters or bad gas it probably took it's toll. I take mine apart about twice a year and spray carb cleaner thru it, then check all the filters and spray them out including the sediment bowl if needed. Doesn't take much time and seems to help keep things running smoothly.
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01-23-2021, 12:37 PM | #17 | |
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Re: Dirty Carburetors
Quote:
I have had better luck with Snyders vs the wix brand #33039. https://www.snydersantiqueauto.com/P...earchByKeyword |
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01-23-2021, 12:52 PM | #18 | |
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Re: Dirty Carburetors
Quote:
I’m curious. Roughly how many Model A miles do you drive in a year? Sent from my iPhone using Tapatalk |
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01-23-2021, 03:49 PM | #19 |
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Re: Dirty Carburetors
I do about 4,000 miles per year.
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01-23-2021, 03:59 PM | #20 |
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Re: Dirty Carburetors
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