Hi Mary Lou,

It is diaphragm.  They are common on small engines that change orientation,
like weed whackers and chain saws.

Better quality outboard makers, like Evinrude, only use diaphragm
carburetors.  Others offer them as an option.

I think idle jets are about the same regardless of carburetor
architecture.  The thing about ethanol is that it dissolves all the goo and
water in the gas tank and fuel line that was left behind by ethanol-free
gasoline.  When the ethanol evaporates from an unused carburetor bowl, the
contaminates separate out and are thus able to clog the jets.  Additives
keep the dirt and water suspended after the ethanol is gone.

Rick

On Mon, Jun 19, 2017 at 1:56 PM, Mary Lou Troy <mtroy at atlanticbb.net> wrote:

> Rick,
>
> What the heck is a diagram carburetor? Never heard the term. Maybe
> diaphragm? I've never heard of that on an outboard either. Is it an option
> on some outboards? Or aftermarket?
>
> Does the design change the idle jets as well? That seems to be some of the
> issue with the ethanol gas.
>
> If that fixes the problem with ethanol gas, how come we're not all using
> them? Would seem a lot easier than trundling all over the place searching
> for ethanol free. There would be a good market for them here in Maryland
> and Delaware where ethanol free gas is pretty scarce.
>
> Thanks,
>
> Mary Lou
>
> Rosborough RF-246 Tara
>
> ex- Rhodes 22
>
>
>
> On 6/19/2017 1:36 PM, Rick wrote:
>
>> Oh, the folly of bowl carburetors!  All this talk of disconnecting fuel
>> lines and adding additives to prevent deposits accumulating in bowls puts
>> one more check mark in the pro column of diagram carburetors.
>>
>> I've always paid the premium for diagram carburetors in my outboards
>> because they run steady through the waves.  The only residue problems I've
>> had is cleaning goo off the spark plugs.  But with the advent of
>> "gasohol",
>> the goo is gone and only dry carbon black needs cleaning at the end of the
>> season.
>>
>> Rick
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