As I have a new boot floor fitted can anyone tell me the dimensions for the nut for the fuel tank clamp.
this is the old one. also there is a big hole where tank drain sat is this correct? I did not take measurements



this is the new floor when I fit the tank I cannot get in to mark where hole should be for the fuel tank clamp.



this is drain fittting for tank it fouls on the floor when the tank is in. thus the hole in the original rusted floor.



any help thanks

Holesaw the new shiny floor?
Plug the drain?

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It's easy once you know how.

that's what I what to know is it a wrong fitting?

The bolt for the strap, if you shape a point on the end of a bolt you should be able to thread it up from the underside which will dimple the floor where the hole should be. Then drill it out from the inside with out damaging the thread of the captive nut.

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Respect mine and I'll respect yours.

my current tank has the same drain fitting.
with slightly longer pipe.

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It's easy once you know how.

Captive nut is not there anymore. thus I do not know the position of hole. I was planning to drill and fit a nut sert.

does your tank sit up off the floor a bit? would be great if had a picture.

will try for one tomorrow, it has some "horsehair" looking stuff between it and the base
the previous tank had no drain and when it ruptured this current one went in roadside I had to drill a hole for the drain.
scary stuff with fuel vapors everywhere.

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It's easy once you know how.

Id be sticking some thing between the floor and bottom of the tank

Mine also had the horse hair stuff like the old heshen carpet underlay stuff in that area

Also wonder how many minis still have this stuff between the rear subframe and under boot floor of body mine has

I managed to get this heshen under lay stuff from a house i tore carpet up at last year they reckon it has asbestos in it when i done a google search about it

I checked on an old mini boot with the tank out. and drilled my boot



the hole needs to be 5" (125mm) and 5/8" (16mm) from mounting plate.

if anyone else needs to do this be careful not to let the drill go through too far I put a small mark on the under beaver panel Bugger

to seal the fuel tank and not cut a hole in boot floor. I used an old bleed screw. shortened it and cut a groove to tighten in the drain hole seems to seal.

well plug didn't seal properly so I decided to cut hole to suit bleed tube.
so I thought I would put the hole position on here to assist anyone else.
2 1/2" across and 1 1/2" down from tank seat.
1" diam hole





worked oout pretty good clearance for plug


I just have to purchase a fuel tank drain plug tube.

I just put a grub screw in it with some teflon tape, that was 8 years ago....,

Dont forget the special grommet that seals the tank to the drain hole!!!!! It will stop water from geting in.

Got some blanking grommets will use 25mm wad punch when work out tube centre.