[AT] Cub problem

[Cecil Bearden]

If you ran the cheap unleaded gas in it, then I would bet there are some 
white flakes of dried surfactant in the carburetor.  If the gas had any 
ethanol ( as all of it has some, even the no ethanol ) then there is a 
flake of rust in it.    I run only the highest grade of ethanol free 
gasoline in all of my older engines that were built prior to unleaded 
gas.   I think I have told the story before of having to use the high 
grade of gas on my fire pumps to get them to meet the test 
requirements.  I have lost a lot of small engine carburetors to ethanol 
in the gas even  the no ethanol grade.  A little Marvel Mystery Oil 
seems to help keep the ethanol from attaching the carburetor when it 
dries out.    Unleaded low octane gas has a surfactant in it to make it 
burn at a lower temperature for less emissions.  It seems counter 
productive, but that's the EPA... The engine needs heat to operate 
efficiently and the gas has water added to lower the heat content.   I 
was told by a petroleum engineer that the white powder/flakes in the 
carburetor left  when the gas evaporates is the surfactant  to make the 
water mix... Ethanol just causes more water to be pulled from the air...

I once had an Onan Generator with a 30 gal tank.  I had to run Methanol 
in the gas to keep the carb from icing when running in the middle of the 
night.  This was during the 2001 Ice Storm.   We ran for 27 days on 
Generator.   I bought a diesel generator and sold the Onan.  The buyer 
brought the generator back as it only ran one tank of gas through it  
and then would not start.   Rust from had built up in the bottom of the 
tank and blocked the fuel inlet.   The rust was very finely powdered.  
The gas tank was completely dry from the methanol.  I connected a 1/2 
inch pipe to my shop vacuum and sucked every bit of rust out of the 
tank.  I then put a 1 inch long tubing in the fuel bowl inlet to stick 
up in the tank and prevent water and sediment  from plugging up the fuel 
line...

Just my $0.02

Cecil in OKla


On 5/12/2016 10:14 PM, Mike M wrote:
>
> On 5/12/2016 2:15 PM, Greg Hass wrote:
>> Am having trouble with my 1949 Farmall Cub. It sat from fall until about
>> April when I started it.
>>    
> IT SAT.  If it had fuel in the carb, my money would bet on a fuel system
> issue. These carbs are so easy to pull apart, why not pull it and give
> it a good cleaning and blow out? Stop trying to find the the zebra in
> the room when the 900 lb gorilla is staring you in the face. Make sure
> all the orifices and jets are squeaky clean. Then check for crap
> floating around your fuel tank that could clog the screen if so equipped.
>
> Mike M
>>        
>
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