definitely a fuel pump issue, as andy said spec is 51psi +/- 1.
I had 51 while running and about 40 when key on power without running last week when i tested mine. it shouldnt drop off right away either, mine held for a good bit while testing it.
you might be able to do a rebuild with the $65 kit from BRP otherwise a pump assembly is about $300-350. I think rocky mountain had the cheapest oem pumps but never ended up buying one.
Check your plugs too while you are at it. $20 for plugs, make sure they are gapped properly. check your air filter and replace. might as well do the oil in it too LOL
steve