>Do you know for a fact if this works?  I've heard that
>there is an oily residue that sticks pretty well to the
>inner walls on the tank and thinking that it may not
>come off so easily.

I believe this is why people have problems with welding fuel tanks. I have
heard of explosions injuring people even though they have filled it with
water to rinse out any left over fuel, and have then attempted to weld it
after emptying the water out. There is enough residue of some sort left in
the tank that will not wash out which will leach fumes back into the tank,
resulting in an explosive mixture eventually.

If such a tank had to be welded, my pick would be to use a nitrogen gas feed
into the tank to purge it rather than carbon monoxide from an exhaust, and
do the job out side. A continuous purge during welding would be necessary.

I believe a vehicle exhaust is likely to have enough unburnt fuel in it to
still be able to have an explosive mixture in the tank, especially if it
condensed on the inside of the tank, and so was able to build up a suitable
concentration.

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