check valve on top of fuel tank

1980-1986 Datsun 720 forums. All 720-specific topics and discussion can be found here.
pacman720
Posts: 4
Joined: Thu May 09, 2013 8:21 pm
Car: 1984 Nissan 720

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About a couple of years ago I swapped out what I thought was an in line fuel filter, which ended up being a fuel check valve. What damage does this cause or is it primarily for emissions?


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