Sedan Guys lets talk gas tanks locations and back seats

Boones,
Your question is one I have been pondering for quite some time.
First, Mecutem brings up my biggest concerns.
I,m building (slowly) a 30 tudor that will be a simulation of a jalopy racer circa 1950. The body will be channeled 4" and there is a 7' kick to the frame rails just ahead of ith differential. It is primarily a 2 p***enger car but it would be nice to be able to sqeeze in a couple of extra bodies for short distances.
My current thinking is very similar to that shown by loudpipes-wide, tall, thin tank with external fill and vent.Looks like FkyingA also has a pretty good solution.In eighther case I will install an independent fire wall to isolate the tank from the interior of car ala local jalopy race rules. fairly easy to fab out of aluminum.Can be sealed with 3M fire resistant sealer.The rear of the car will be protected with a fairly substantial nerf bar.
Safety should always be a concern though no car built can be absolutely safe from all possibilities as some else mentioned.
Good luck.
Ted

 

Deuce Roadster's got some good points about running a Deuce tank on a sedan.
They look good to me on sedan or coupe, but a touch lacking on an A roadster.

The sedan inside rear mounted tank would be safer - in my opinion - if the floor was cut away and the tank hung as low as possible.
A welded sheet metal floor cover would in effect make the tank an outside tank.

I'm not too wild about fuel cells inside either.
I run one in the 32's trunk, but don't really care for it and have been thinking about going to a regular Deuce tank for it.
All I gotta do there is weld the frame horns back on.

Far as my 31 on 32 rails roadster goes, the frame was set up to take a pair of inside the frame rail tanks.
Perusal of the pic below shows where they go.
In back of the 4 link crossmember and in front of the rear end.
Done originally to sidestep the SCTA ruling of no belly pans in the street roadster cl***, but flat bottomed underbody tanks are not against the rules.

There is some genuine crash protection with the tanks mounted this way.
Not to mention if the tank/tanks were breached the fire would be outside the car and an escape could be managed.

Along with the underbody fuel tanks, the 31 gets a four point roll bar like the 32 has.
For rollover protection as is obvious, but the rear legs and the roll bar proper would help protect the occupants if the roadster got rear ended.

Like Deuce Roadster says, m***ive fuel capacity is not needed.
My 32 has a 16 gallon fuel cell, but I've never put more than 12 gallons in it.
Mileage varies between ten and sixteen mpg and long trips aren't too big a deal.
Gotta get out and walk around now and then anyway.

From what I've figured the dual tanks in the 31 will hold seven gallons + each so no big deal there.
Lots of ways to plumb them as well.
A main and alternate tank with dual fuel level gauges and tank selector.
Plumbed so both will draw and a gauge sender in one - that's the way I'm leaning right now.

Filling should be reasonably easy with one filler on top of the deck just behind the ****pit rail.
A split filler pipe inside the trunk at the front and then leading down to the tanks should work well in getting both tanks topped off.
The tanks would siphon into an electric pump so I don't think there will be any fuel draw problems there.
Siphon because the fuel outlet fitting will be at the top of the tank with appropriate dip tube or whatever it's called inside the tank.

A couple of ball valves for shutoff to be able to change fuel filters should do it.