Re: [OMC-Boats] Carb and fuel gauge

I have always shut off the fuel (valve on the fuel line in the engine compartment) and let it run out as I dump oil down the carb as is called out in the winterization section of my OMC owner's manual.  Yes, it would be better if the carb had a drain plug, but I've never disassembled it to go after the small amount remaining.  Justin is absolutely right though -- full tank, empty carb is generally the best for any carbureted engine.

Lee:  I'm skeptical of any product that claims "PRI-G goes a step further, actually restoring old fuel to refinery-fresh conditions."  I'll have to check with some of my triboligist friends, but I didn't think that was possible.  For one thing, once the moisture content increases, adding a stabilizer doesn't eliminate it, it just dilutes it.  I know with engine oil the additives breakdown, reducing protection for the engine.  Returning some of the additives helps (i.e. STP oil treatment), but its generally not as good as fresh oil based on the data I've seen.  I'll see what I can learn from those who supposedly know (i.e. the referenced SAE Fuels & Lubricants Standards Committee which I occasionally sit in on).

Andy

'67 Reveler 155

----- Original Message -----
From: "Justin DeSantis" <duc1098desmo@...>
To: "Evinrude & Johnson Boats of the 1960's and 70's" <omc-boats@...mate.com>
Sent: Tuesday, September 29, 2009 1:41:53 PM GMT -05:00 US/Canada Eastern
Subject: Re: [OMC-Boats] Carb and fuel gauge

Well, on lots of carbs, there is a drain at the bottom of the bowl. I
noticed my 2bbl Rochester doesn't have a drain screw. So draining
would require removal. Or at the least, removing the top of the carb
and sucking out the fuel with a syringe or turkey baster type thing.

On Tue, Sep 29, 2009 at 1:25 PM, jd <jdood@...> wrote:
> how do you drain the carb?   Does is all run out when you disconnect the
> fuel line or is there another way?
>
>
>
>
>
> On Sep 29, 2009, at 10:04 AM, Justin DeSantis wrote:
>
>>> what with an outboard?
>>
>> With any engine, the optimum storage is full tank, empty carbs. Carbs
>> don't hold much gas and the less gas there is the quicker is goes bad.
>> So carbs empty to prevent the gas in them from turning to goo and
>> clogging jets. Full tank to prevent condensation. If theres air space,
>> you can have condensation, this rusts the tank and contaminates the
>> gas with water. The less gas in the tank, the more room for
>> condensation. And the higher the ratio of water to gas. Full tank and
>> empty carb. I prefer to drain the carb as opposed to just running it
>> dry. If you drain it, it's all gone, if you run it dry there may still
>> be enough in there to turn to goo. Sta-bil helps. But I prefer to rely
>> on it for the gas in the tank. Again, the more gas, the longer it will
>> last.
>>
>>
>>> I had someone tell me yrs back that it's always a good idea to run the
>>> fuel
>>> out of the engine after EVERY use.
>>
>> Overkill.
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Received on Tuesday, 29 September 2009