I've never found any broken down foam in my fuel filters. I do run a Mallory Comp 500 racing fuel filter though just to be certain.
The two vent fittings are: one is for a return line from an electric fuel pump and the other is to vent the cell. Make sure you do use a vent because I found out the hard way that if you use a high volume pump (I use a 400GPM Barry Grant) you will suck down the top of the cell and not get any fuel to the engine (not a good thing to have happen in the middle of a mud race or half way up a rock) :mrgreen: