11-01-2013, 05:42 PM
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#20 (permalink)
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Not an active Vendor. DO NOT BUY
Join Date: Sep 2009
Location: California
Posts: 391
Drives: '13 Hot Lava FR-S
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Quote:
Originally Posted by OldBoy
Very interesting about the EVAP emissions regulations, didn't think of that one. I guess the more you move fuel, the more vapors will be created in the gas tank, but I don't see why a return-less system might be better tho?
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A return line generates a small, but measurable amount of evaporative emissions since the fuel traveling through the line will permeate through the line over time. Therefore, it would require more expensive material that prevents permeation known as SAE J30R7 rated hose. Even then, the longer the line, the more surface area that the fuel can permeate through. Therefore, it is ultimately less expensive to use a returnless fuel system to keep evaporative emissions low enough to pass EPA and CARB mandates. When it comes to OEM's, saving a few pennies per car translates to big savings over tens of thousands of cars.
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