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Could perhaps use some plumbers putty to seal it off whilst you empty.
https://www.diy.com/departments/evo-stik-putty-50g/191081_BQ.prd
Should create a watertight (or diesel) seal for long enough until you can get it repaired
How did you notice the leak then.
Plastic tank isn't it? Soldering iron to melt the hole back up