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Old 05-12-2018, 11:36 AM
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This is exactly how I have run my A4, two outboard boats, and all piston engine airplanes since forever and it seems to work well. I shut my fuel pump off when done for the day and let the engine run all the gas out. Outboards get the fuel line removed and run out and airplanes get the mixture pulled full lean and run out.
IMHO there are two sources for this dreaded white powder:
1. Something in the gas. You could evaporate some gas and see if it leaves white residue.
2. The gas is corroding the carb. I have found the long term solution to this was a new carb. Once the metal started corroding it seemed to get much more prone to it from then on. I have posted before about this issue where ethanol laced gasoline can be quite corrosive to aluminum/zinc carbs. Some fuel additives fight this and SeaFoam is the cheapest one that does a good job. Water in the fuel makes the issue much worse. I would clean the carb out, use SeaFoam, and see if it comes back. Also make SURE water isn't getting into the fuel.

Last edited by joe_db; 05-12-2018 at 11:42 AM.
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