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dont know if itll be any help, but my fuel system has the feed line to the front, the return port capped and the vent port vented to atmosphere with a small breather on the end. Ive ran that set up the whole time and never had any issues, nor any fumes in the garage.
but i dont drive it nearly as much as you.
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99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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