Fuel Cell Venting

Found this from another forum. Very interesting info. on something most of us never give a second thought about.
Danny Nelson of RaceCraft chassis wrote this.

Enlarge the pic to see it better.

Holy Cow ! That's exactly how mine is routed, by accident of coarse.

That is some handy info there that can be applied to any kind of car. I edited my post because I miss-understood the picture the first time i looked at it. I should have zoomed in an actually read it .. Duh....

would'nt a cell vented out the bottom push fuel out if it were to build some psi inside?

The cell isn't vented out the bottom, the pic is showing an upside down car situation. The other pics show car laying on it's left side and laying on it's right side.

I read it a couple of times myself before I understood his point.

Problem is that only applies if you slowly roll the car, as in pick it up yourself and roll it. Once you violently roll, like what happens in a crash, that fuel cell will spray out the vent just from centrifigul force... Happened on our dragster back in April. Fuel AND oil was everywhere!!!!!!!!!

Only problem is not every cell made is vented from either the top left or the top right side of the cell like the drawing shows. Some are in fact vented from somewhere along the centerline of the top of the cell.

Also I think he might need to revise his drawings a little and raise the fuel level/height some on the "on it's side" drawings. The right side up & up side down drawings show approximately a 3/4 to 7/8 full fuel cell. But the "on it's right/left side" drawings show the cell to be only about 1/2 full.

In his reccomended drawing, I don't think it matters if the vent is left, right, or centered. As long as the line extends past the bottom of the fuel cell.

You're right John, in a violent rollover it isn't going to matter where the vent is run. A tipover valve may reduce the amount some but nothing will stop it completely.

The accident he witnessed, as best as I could tell, the landed on it's side or roof and the fuel was just gushing out the vent line.