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Super Moderator
8 / 71 240Z, HLS30-40031, L24-052899, Sunshine Yellow
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If evaporative emission controls don’t vent the gas tank, it can create a vacuum that the fuel pump can’t overcome. (Flow guide valve on the old ones) Rare occurrence but easy enough to check by running it with the gas cap off or loose.
Or in your case, a build up of pressure.
Maybe the previous owner plugged that vent line.
White Font Line Parallel Engineering
 
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