Are you sure the pump is leaking, or could it be a hose?
I blew a low pressure ps return line 2 years ago on Yankee Hill and replaced it with a piece of fire extinguisher hose.
When I went back in to do a proper fix, last year (!) I noticed another low pressure ps return line that was petrified, similar to the one that blew. Both hoses felt like they were made of pvc, they were so hard. Those 80 series engine bays are like a pizza oven man.
You might check these before you worry about a full pump rebuild. It helps if you pull the battery and tray for access. You can buy the line fairly cheap at any auto supply store.