High capacity fuel tank?

I know that FMS (now FRPP) used to sell a 15 gallon fuel tank like the one used on the 351R but that is only 1 gallon larger than stock. Does anyone know of a higher capacity fuel tank for our cars?

I would love to know this too, would like to fuel up less often.

How much space do we have to give under there? Seems like the couple times i had mine out, there's not much room for expansion besides straight down....which would kill the looks unless u added a lower bumper. Slicing the bumper in half on a horizontal plane then welding in metal...would probably add a few gallons. Just depends if its really worth it to ya....

Owners manual states we have a 15.4 gallon tank, best I can get is 14 when I'm really low. Not sure I could get 15.4 on a completely empty tank though.

I know when I dropped my tank last there was 1 1/2 gallons of gas left in there when the car was too empty to start.

I was mulling around and think that significant space could be had by ditching the spare tire well (and the spare, of course).

IIRC this is what they did on the 351 R so maybe that tank was larger than 15 gallons.

The 95 Cobra R tank was 20-gallons. Some places mention 22-gallon, but I'm fairly sure it's only 20. The tank was larger than the other Mustang tanks to increase race time between pit stops.

You can still buy them but IIRC they are like $2400.

Thats also a idea. Hopefully u up your HP to compensate for the weight

Late Mustang Models | Fuel Safe

I've seen this model most often on stangs. Expensive, but safety is ramped up big time. It is also supposed to fit in the same stock location, i.e. it's now wider than a stock tank so should be no issue with tires, exhaust, etc.

If you don't mind a rear sumped tank check thses out:

Glenn's Performance