Hi,
The old age will show it in the dried out or pumverized pump leather. If you are lucky, you can salvage it by soaking it in oil. If it is damaged beyond repair, you must replace it.
There are basically two sources: one in UK, Base Camp. They are one of the sponsors of this website, and contact them.
The other is Albert, who regularly contributes to this website and is a reliable source of knowledge and history, located in Australia. Search for his e-mail address and give him a call. His price is reasonable and quality superb.
While you are at it, do try to get a heat proof seal as well. You may need it, if you take the burner off, in order to remove the internal carbon deposit. You may find the burner produces yellow, sooty flame, when everything is done right. Post again, if this happenes, and there are ways do fix such a problem.
You may want to examine the seal on the fuel cap, and make sure it is soft and good. Replace it as necessary, and find an alternative in a hardware store's plumbing section.
Also the check valve located deep within the pump tube may have a hardened button-shaped seal that lets out the air and fuel into the tube. This will be evidenced by the pump handle slowly extending by itself after pumping.
Once you get these in order, the stove should work well.
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