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my personal opinion on it is the same way i feel about fuel line alignment magnets, the air intake tornadoes or turbonators, fuel tank bio pills, experimental patented 100 mpg carburetors on ebay, and the exhaust spinners.
lets get some people with no morals, and pay them to make outrageous claims about how our product will double or triple your fuel mileage, and how it worked so good for them. if it's on tv, then it must be true. they would never let people on tv lie to us.
I've never met a real mechanic who used these, even the old timers who were around when such "magic fuel savers" were in the back pages of every magazine... How would it atomize the fuel better, whether your vehicle was carbed or EFI? You do realize that it plumbs into the PCV suction line, which no fuel flows through in the first place... all it is is a glorified PCV filter, with an an unfiltered air bleed (the 1/4" tube sticking out of the top in subford's picture), which would let dust into the engine and ruin your rings.
You could do the same thing by installing a filter in your current PCV line, then poking a small hole in the hose. I guess the extra air in bypassing the carb could theoretically lean the mix slightly on a carbureted engine, which would maybe give you a couple percent better mileage. Or you could just lower your float level a little bit.
After thinking and reading about this some more, maybe the theory is that the fuel mileage comes from the engine not choking on oil (if it has excessive blowby). If that were the case, you could just cap the PCV nipple on the intake and run a crankcase breather.
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