Also, use an impact wrench on the pulley remove/installer. It turns a swearfest into a less than 3 minute process.
If you're feeling adventurous and the hole is small, you could remove the pump, degrease it and use a plastic epoxy to seal the hole.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne