bjuice

Now this depends if your class racing or not..but if your placing a aftermarket fuel cell in the back of a car just to drive on the street or be a Saturday night drag strip..car....the answer is NO there is no speacial requirments,,but never a bad idea to place a make shift firwall as long as you can neatly fabricate it....the tanks are designed to be placed in back of cars that run well over 200 mph...yes some 200 mph cars have tail lights also..i have one of them....get any fuel cell from Jazz,RCI ETC....be sure you design some good mounts to stabilize the fuel cell..
DO NOT run your fuel line inside the cock pit of the car..run along side the frame rails and tuck it close up against the underside of the car carriage and the frame rails...go ahead and get you an inline fuel filter also.. as far as ventilation..the tank will have a vent hole..just go ahead and connect you a rubber line and get one of those tiny air filters ( look like miniature KN) filters..they can be purchased from auto zone in the rice burner section...

next you can buy an aftermarket manual fuel pump and place you some #8 fittings to connect your fuel line from the tank..i say #8 cause i am assuming you running a stocker car...from the pump you can plumb on up to the carb...also get the pump that doesn't require a regulator if your car is stock.....

all this can be purchased from JEGS..anymore questions feel free to ask..

ohhh by the way ,,you most likely going to need one of those larger pro-street fuel cells..they also come with inner foam.

Brian