Thank you Sir! I will check that 1st and let ya'll know. Sounds like a
definite likelihood. Hope that's it, then I won't have to worry about
testing the black boxes. Ethanol in the fuel has caused problem for me
in small engines before, usually the needle and seat. I wish the corn
farmers would let that go! I hear some in the govt are pushing for even
higher ethanol levels in the near future. Even more problem for gas
engines!
LarryT
On 01/12/2019 11:10 PM, G Mann via Mercedes wrote:
Check the carb float bowl for water. Your post says engine speed increased
or sound changed before shutdown...
Water in fuel migrates into the float bowl... and accumulates in the
bottom, as water level increases, less and less fuel can pass through the
main jet in the center of the carb just above the fuel bowl... finally,
water level rises to the point where the main jet gets no gas, and water,
being heavier than gas, shuts off the flow of gas to fuel jet. Engine dies,
restart doesn't happen because engine is "out of gas" at the main jet...
fuel in tank can not over power water in bowl.. dead engine..
Put a can under the carb bowl, remove the bolt at center of float bowl,
drop bowl, with contents into can.. Inspect for water.... Bet that is your
problem..
Ethanol gas is hydroscopic.. it draws moisture and absorbs it .. said
moisture then condenses in to carb in droplets.
On Sat, Jan 12, 2019 at 6:31 PM Mitch Haley via Mercedes <
mercedes@okiebenz.com> wrote:
The old way to manage the 'oil alert' shutoff was to short out the
ignition like an ignition switch does.
Some generators have a solenoid on the carb operated by the oil level
switch, usually through a control box.
If the engine note changed before shutdown, the shutdown wasn't purely
electrical. Switching off the ignition just results in the engine coasting
to a stop and quickly.
But it might involve a fuel shutoff like is found on the carburetors of my
Subaru generator and the Briggs engine on my Trail Mower. The mixture would
go lean and then the engine would cut out when it got too lean to sustain
fire.
But if it is the oil alert, is it because the oil level is low, the switch
is bad, the wiring is bad, or the 'black box' is bad?
I'd say step one is to make sure the oil level reads maximum.
Step two, shut off the fuel, take the hose off at the carb, put the end of
the hose in a container, and turn the fuel back on. Does the gas tank
supply fuel to the carb?
Step 3, put the plug wire on a loose spark plug and hold it while the wife
pulls the starter rope. If you say "yeow" and drop the plug, the ignition
is good. I used to use #3 as a last resort in my youth when working on
motorcycles and lawn mowers, but it's a fast and effective test.
After step 3 it gets less simple to diagnose.
Mitch.
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--
LarryT
Youroil.net
PMO Carbs / Weber Parts / Oil Analysis
91 300D
74 911
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