Posted by Deutz Lover on October 08, 2018 at 08:21:34 from (174.218.2.125):
In Reply to: Silt in Float bowl posted by Janicholson on October 07, 2018 at 18:06:01:
The sludge does look like some kind of metallic oxide and may be in an aqueous slurry/mud that settled down in the bowl. I have seen this before and as Bob said it may be from terne plating in the tank. I have not seen many iron body carburetors in my life, but I have seen this frequently in old alloy carburetors.
It could be from a precipitation reaction from dissolved materials. You could do a flame test on it. Take a small dab and put it on a stainless steel loop. Heat it to high temp outside with a propane torch. The color will indicate the metal/metals. If it is a mixture of metals it might be more difficult to identify them.
I am not sure what happens to tetraethyl lead in old gas,; but the amount in the bowl is more than likely from the fuel tank lining.
Identifying it further would be a waste of time unless you really want to know and know a chemist.
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