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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
who22
Because it was dripping from inside.
(This is after major cleanup followed by a second quick trip around the block.)
It was pumping up into the van and then slowly dripping out the side drain holes when stopped.