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When I first started drag racing I also had that splash out issue, so on my 70 with the pop-open fuel cover, I removed the spring loaded mechanism inside and put a "non-vented" screw on cap (Wanted the stock look on the outside). The filler neck goes to my fuel cell, which is vented with a roll over vent valve on the cell, then AN braided hose with a few loops to under the car and a small K&N filter to keep any dust from getting sucked in. Not a drop ever escapes out now.
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