In article , Nick Hull says...

1) remove tank from vehicle.

2) invert, drain out fuel residue.

3) fill with water, drill out plug.

How do you fill with water if it is upside down? How do you keep the
water in unless you are drilling from the bottom, then the water will
come out on to your drill & zap you.

OK I'll revise the steps.

1) remove tank from vehicle.

2) invert, drain out fuel residue.

3) re-orient tank so fill port is up.

4) fill with water

5) cap fill port with h2o-impermeable cover

6) invert tank, drill out plug.

Re-tap the threads, re-install plug or fitting.

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