How to clean a fuel tank out?

[tight fart]

I've got an old car I'm trying to bring back to life, its stood for 10 years plus.
About 2 months back I started it for the first time, I'd drained the tank put about
10 litres of fresh fuel in and got it going, started easy and all sounded fine (ish)
Today I tried to start it again, put about 3 litres of fresh fuel in but it wouldn't start,
I ended up draining the tank again an the fuel had gone off completely.
Now I thing the fuel tank needs cleaning before trying again
Any tips on cleaning out an old steel tank in situ?

[tight fart]

This is the fuel I took out of the tank today,

[tight fart]

Evoluzione said:

Yes, but what is it?

That was a mixture of 8 week old petrol and fresh, the fuel that came out when I first drained it stunk the garage out and was nearly black. I'm guessing there's a residue left in the tank that's contaminating the new fuel.

[tight fart]

That's just the sky reflecting

[tight fart]

Thanks John, that was all that came out, and I put it in the Land Rover to thin down the chip oil as winters coming.
I'll have to look at what's involved to get the tank out.

[tight fart]

After buying a cheap inspection camera, that dosen't take very good pictures
I managed to get this image of the bottom of the tank? (inside)

Edited by tight fart on Sunday 20th November 10:24