Originally Posted by davidpm
There are fuel polishing services. they pump your fuel through a series of filters to make sure it is clean.
I imagine that will cost more than the 10 or 20L of fuel actually in the tank. But the problem is what's in the tank... I imagine, and I have to use my imagination since I can't see in there, it has some rust and debris that needs to be washed, cleaned out and then repaired or it will continue to rust.