Could be up to 12 months, hasn't had a lot of use though, figure seal dried out.How long ago since it was working?
Thought might be able to lubricate seal but yours may be only answer, can probably live without it for this tripI had the same problem with mine. I just installed a new one from eBay and all good now.
Thanks for that will try this arvoCheck hose clamps then take the top off and smear a small amount of vaseline, olive oil around the seal on the shaft, put it back together again and bingo it should prime.............just like an old style handraulic bike pump, use long slow strokes don't pump it like a demon, it's all in the timing...............................................................now that is difficult to type out.