Can't comment on the high altitude - don't think my UK pump has this.
Re: Fuel priming - I had an issue with mine not starting a few weeks ago after leaving it parked uphill (think fuel drained back to the tank due to leaky pump seals). Couldn't get it going with just cranking. Borrowed a little electric pump (old petrol Mini SU points pump) which REALLY struggled to pump anything (far too thick) but it worked just to force a bit of fuel into the IP. I then disconnected it and fed the IP inlet straight from a bottle held above the IP. Started straight away on that (even though it was a 1ltr bottle of Sunflower Oil). Let it run for a bit then plumbed the inlet back into the fuel filter and it was fine then.
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