One thing I've never liked is the fuel tank in the boot of my Clubman saloon. It's dangerous, a right pain if there's a leak at the outlet and takes up far too much room in the boot, which could hold a fair bit of stuff if the tank wasn't there. I'm planning to do a fair bit of work on her in the near future so I'm thinking about putting a tank under the floor. I don't carry a spare wheel, just a small compressor and a couple bottles of tyre sealer so the floor can be converted to a flat floor. Possibly the battery could be swapped for a smaller one? No idea if there is smaller batteries available that can put out the same amps? If so that could be relocated or even a smaller and neater battery box installed. So doing this would leave a big space in the middle of the rear subframe, which would be lovely for a tank. So I'm guessing that this has already been done? If so what are the pitfalls or issues? I've not been out this morning to put a tape measure on the rear sub but is there enough room to fit a 34L tank in there?

Saloon Under Floor Fuel Tank
#1
Posted 23 July 2021 - 08:06 AM
#2
Posted 23 July 2021 - 08:41 AM
The Minki project moved the fuel tank under the rear seat: http://www.austinmem...d-29/index.html
#3
Posted 23 July 2021 - 08:48 AM
#4
Posted 23 July 2021 - 10:15 AM
Moving the tank under the car would be a lot more unsafe than having it where it normally sits.
why do you think that ?
#5
Posted 23 July 2021 - 10:36 AM
If you use a 30litre racing fuel cell, that will fit inside the rear subframe it will only be about 7.5 inches deep so by raising the boot floor this amount will not protrude too much into the boot areas. Similar to: https://www.ebay.co....vgAAOSwUyZfc0sB
The battery can be a lithium one which can be tiny, and can be placed on its side pretty much anywhere. Under the back seat or in the engine compartment.
Sounds like a project worth doing. Good luck.
#6
Posted 23 July 2021 - 11:21 AM
Moving the tank under the car would be a lot more unsafe than having it where it normally sits.
why do you think that ?
A good speedbump will rip it off. More corrosion prone. Even less protection in an accident.
#7
Posted 23 July 2021 - 11:36 AM
Moving the tank under the car would be a lot more unsafe than having it where it normally sits.
why do you think that ?
Ok where you going to put the exhaust?
#8
Posted 23 July 2021 - 12:45 PM
The Minki project moved the fuel tank under the rear seat: http://www.austinmem...d-29/index.html
Minki II sounds like the mini that certainly should have been. I have been thinking about the wasted space under the rear seat, I think quite a lot of modern hatchbacks use this space for fuel tanks? There would have to be some strengthening done where the front mounts of the rear sub fixes to the toe board as the toe board and floor below the seat base would need to be removed. Some beefing up of the inner sill at the rear and around the join of the wheel tubs to the boot floor may be required? Worth thinking about as you could then keep the wheel well and battery box as is.
#9
Posted 23 July 2021 - 12:50 PM
Moving the tank under the car would be a lot more unsafe than having it where it normally sits.
why do you think that ?
Ok where you going to put the exhaust?
Leave the exhaust where it's at. The lowest point any kind of fuel tank could sit at is approx 20 or 30mm above the lowest point of the rear sub. If you're gonna be hitting stuff with the rear sub then you need to rethink your driving style, never mind anything else that's slightly higher than that.
#10
Posted 23 July 2021 - 12:55 PM
Moving the tank under the car would be a lot more unsafe than having it where it normally sits.
why do you think that ?
A good speedbump will rip it off. More corrosion prone. Even less protection in an accident.
A "good" speedbump will cause no issue, a bad speedbump will cause emotional distress. Make the tank from aluminium or better still marine grade stainless. When it boils down to it a classic mini is probably not the car you want to have an accident in anyway, I would be happier if a tank of fuel was on the outside of a mini rather than on the inside, alongside me!
#11
Posted 23 July 2021 - 12:58 PM
Dusky do you have the Youtube channel D3Sshooter?
#12
Posted 23 July 2021 - 01:04 PM
Dusky do you have the Youtube channel D3Sshooter?
No.
#13
Posted 23 July 2021 - 02:24 PM
The Minki project moved the fuel tank under the rear seat: http://www.austinmem...d-29/index.html
Minki II sounds like the mini that certainly should have been. I have been thinking about the wasted space under the rear seat, I think quite a lot of modern hatchbacks use this space for fuel tanks? There would have to be some strengthening done where the front mounts of the rear sub fixes to the toe board as the toe board and floor below the seat base would need to be removed. Some beefing up of the inner sill at the rear and around the join of the wheel tubs to the boot floor may be required? Worth thinking about as you could then keep the wheel well and battery box as is.
But originally there were storage baskets to go under the rear seats.
#14
Posted 23 July 2021 - 02:33 PM
Dusky do you have the Youtube channel D3Sshooter?
No.
My apologise, I saw the Britax replica pic and Belgium location, added 2 + 2 and came up with 7!
#15
Posted 23 July 2021 - 02:35 PM
The Minki project moved the fuel tank under the rear seat: http://www.austinmem...d-29/index.html
Minki II sounds like the mini that certainly should have been. I have been thinking about the wasted space under the rear seat, I think quite a lot of modern hatchbacks use this space for fuel tanks? There would have to be some strengthening done where the front mounts of the rear sub fixes to the toe board as the toe board and floor below the seat base would need to be removed. Some beefing up of the inner sill at the rear and around the join of the wheel tubs to the boot floor may be required? Worth thinking about as you could then keep the wheel well and battery box as is.
But originally there were storage baskets to go under the rear seats.
Ahh makes sense! Yes I suppose you'd loose a bit of interior storage if that was boxed off, but you'd gain in a larger boot space!
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