Bill,
I just got done with my Fuel Cell set-up about a month ago. I vented to the space over the rear axle housing. I ended the hose with a small brake reservoir (with a screen) I had laying around. I purchased a tube style sending unit from Jegs. The install was easy. There is a flip over valve in the 45 degree cell neck and I have a section of clear NASCAR PCV that will run to the filler neck (custom) so I can use my flip cap.
Let me know if you have questions.
--Mike