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In the 60's Don Garlits sold and aluminum needle and neoprene disk replacement for the all metal needle and seat in Stromberg 97 and 48 carburetor. It was recommended for alcohol and nitromethane as well as gasoline. I bought and used 10 of them in two different engines to prevent previous fires as my carbs aged and a hot cam gave a backfire after stalling on a hot day in the blazing sun. Then beginning in 1983 I began to notice that I could not stop dripping in large Briggs and Stratton 8-10 hp engines driving generators. The final straw came with Holley-Weber progressive 2 barrels with Jiffy kits with Viton tipped needles and even a factory rebuild that eventually required a new carburetor and a very high price. Gas station fuel tanks were sending fine particles and when the rustey tanks were replaced the fiberglass was being dissolved by methanol before mostly marine complaints about dissolving fuel tanks led to Ethanol and not methanol. Here is a link for an aircraft explanation. http://thestrombergspecialist.com/index.php/news-info/newsletters/112-stromberg-carb-problem
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