I would purge the IP of all diesel fuel and fill it with ATF. If the sulphur in the diesel were to mix with any condensation from temp changes it could wreak havoc inside the pump.

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82 300SD 202K
82 300SD 233K
83 300TD 340K
82 300TD 98k euro (parts on the hoof)
85 300TD 282K
83 300TD 197K