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Thread: Finch overflow vent size
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03-15-2015 #1
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Finch overflow vent size
I just picked up a Finch fuel vent canister and have to say that it is a REALLY nice piece. I will be mounting it in the trunk. The Aeromarine pump I have (Aeromarine 340) calls for a -6an vent, but the Finch says to run a -4an. I am tight on space so running -4 would be a great option. Can I downsize the vent? Supply and return will be -6.
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03-15-2015 #2
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Finch overflow vent size
Most vent lines are 1/4 nipples anyway, I don't see a problem there.
-DaleSchwartzPerformance
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03-15-2015 #3
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Thanks Dale. Of course pipe (NPT) has always made me wonder. Tubing is usually OD and AN is ID but NPT is neither. 1/4" NPT is close to 3/8", and 1/8" NPT is more like 1/4". The larger NPT sizes are the same. They refer to it as "nominal" but it's really not close. Anyway if you think I can get away with -4 then I am good to go
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