I started putting in my computer...it is an electromotive tec 3 with the distributorless ignition. I used to run it on my truck, and when New England Winters finally took its toll, I took the fuel injection system I had on the 383 stroker and figured I would use parts of it for the boat.
So, as I was figuring out where to mount the computer, I touched a gas line...which hadn't been touched in 25 years or so. The hose fitting disintegrated and I was left with a garage full of gas. Joy.
Since I am replacing the lines I am going to upgrade a little and rather than go -8, -8, to -8 (2 tanks), I am going -8, -8, Y fitting to -10. I also want to run some -6, -6 Y fitting to -8 for return lines when (if) I go fuel injected turbo or blow through turbo (since I have the computer and lots of other parts, I am leaning towards FI). Reading the schematic for fuel pumps though it mentioned vented tanks.
I know the question sounds stupid...but how do I figure out if my tanks are vented? I don't really see a vent anywhere.
I agree, there must be a vent someplace or the tank would collapse or it would stop drawing fuel at some point.
If there is no visible vent, which I assume there isn't, look at the gas cap for a spring loaded diaphragm or a small hole, probably at least 1/8".
If you are upgrading your fuel lines I would suggest to go with Teflon hose and fittings. if the gas today is eating fiberglass tanks what is it doing to the rubber hose. The hose manufactures are starting to suggest all fuel be run thru PTFE.