Leaky petrol tank...

[Bar Vitelli]

Thanks for all the information, everyone, it help me understand what the cause might be and stopped me stressing!  I've checked again this morning, there's a drie out puddle undernetah the car but the dripping has stopped so my theory is it's something at the top of the tank (rather than the bottom) like the neck or the hose that's causing it. 

The petrol smell has gone but is still quite strong inside the car so I've wound the windows down and will take it for a drive this afternoon to check all is okay.

PS

Talking of petrol vouchers, Tesco's has 10p of per litre if you buy 2 packs of loo rolls, stocked up last night, may need them if the petrol sparks up (!!) 

[1973/126]

 Sounds like it is the filler neck hose than.
 You might still had just over 5l of fuel in the tank. Could be the pipe is just perished/cracked or is just not tightened properly.
 I`ve attached couple of photos to give you a better idea. There is suppose to be a clip at the tank end as well, the same as at the top.
 If you find out you need that pipe, just let me know and I`ll post it to you.

[Bar Vitelli]

Thanks, Ladislav, I'll get my mechanical friend to check this week or next and get back to you...

It's an old car (1976) that's been stood a while before I bought it and although it's been recommissioned etc. it's possible that this bit was overlooked so the perished theory could be correct.  The fuel guage was showing empty but given I could only get 15 litres in (and someone said earlier it should be 20 litres) that also makes sense.

PS

The pictures are really helpful...are there any parts that you don't have in that shed of yours (!!)