I was thinking about buying a new jerry can and welding on a second spout. I'd then hook one spout up to a filler (in the same way as the pouring
spouts attach) on the outside of the car and the other spout would be modified to recieve a cap with fuel lines running through. Both spouts would be
attached to thier "bits" with the usual jerry can type fitting, and locking pins.
The can would be located in the usual SVA compliant location: outside of the cabin, out of direct impact, sharp bits, and not in contact with anything
that would rub etc etc.
Seems that they are a nice size, ready made, and if done properly, could satisfy the MOT, but also allow for rapid changing of the tank at track days
for full normal jerry cans (ie you don't need the second spout for filling up.
Just a thought 
Thats a really good idea 
I used to use 5l plastic petrol cans in my racing hovercraft with all the connections via the cap so refueling was a simple swap of body. Used a clam
buckle and strap to hold it in.
Only mods required were a couple of holes in the cap and some fittings
Would like to claim the idea as original but I pinched it from the outboard motor guys!
Works well.
Have you looked at outboard motor fuel tanks ?
My mate used to race with one, no problem at all with this. He place it upright and used the standard filler, just stabbed a couple of holes in for
fuel in/out and breather.
Boat tanks also get used and are nicer as above as designed but of course do cost more.
Regards Mark
It will not pass SVA or MOT if it looks removable though, it must be firmly bolted in. You will have to make the second lid look more permanent if
it's holding the connections to the fuel and return. By the time it is done it will still be quicker to pour the fuel in out of another jerry
can, how many tanks are you thinking of using on the track day?
[Edited on 6/9/08 by Peteff]
Mine passed the SVA with only 2 webbing straps and clamshell buckles holding it in
Maybe as an "option" for post SVA then 
How much fuel? Well, at the ring I was getting about 6 or 7 miles to the gallon which is, as it happens, 6 or 7 laps to a 60 litre tank.
A 20 litre tank would give me a couple of laps....
baffles?
quote:
Originally posted by v8kid
Mine passed the SVA with only 2 webbing straps and clamshell buckles holding it in
quote:
Originally posted by Mark G
baffles?
Hmm nice straps they will become a must have accessory for the boys at the drag strip.