Far as I know:
* gas caps have both a valve to let air IN (prevents tank collapse) and a high pressure relief valve (prevents a blown tank) * evap systems work by taking any excess gas vapor (or liquid)......say after you've refilled on a hot day * pressure builds up in the tank to the point it overcomes the valve at the canister...allowing vapor/liquid to go into the canister * at times the ECU bleeds outside air in thru the bottom of the canister and this pulls the vapors from the carbon into the engine In theory this is how an FA2000 should work...where you are providing a small amount of vapor using the PCV flow...haven't seen any gain yet with mine though. |
Sorry, clencherman - you lost me: what were you scrutinizing? Did you do a weight reduction test with the car?
Regardless, props for the "beware of one-tank conclusions" disclaimer. |
He's saying the he only ran the first have of his tank to test the theory that a more full tank will get better mileage.
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Ah, gotcha. Thanks.
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I tried the same 1/4 tank refill with the 4 cyl and found the opposite....less mpg...then found that the ECU controlled valve that bleeds the canister didn't work...had a good spare and put it in. Didn't retest to see if it made a diff.
Any gas getting to the canister was wasted. |
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