Jet pump doesn't build pressure after it had been turned off for a while

I have a 3/4 hp jet pump in my well that has two lines going to the well. I had shut it off before I went away for a week because I was concerned about freezing.
After returning, it no longer pumps any pressure. There is water in the pump casing I see in the priming plug, so it appears to be primed. When it runs, it will pump a very small amount of water out of a hose below the pump. The gauge on the pump casing reads zero, but does jiggle a little.
My internet investigation indicates to me that it could be a clogged jet down in the well.
What other possible explanations are there, and how difficult is it for a couple of guys to pull the black poly drop pipe and replace the jet if necessary?
Thanks,
Sam.
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On Thu, 30 Dec 2010 16:59:19 -0800, Sam wrote:

There should be a control valve on the pump - did you shut this off? I think it has to be closed for the pump to prime properly, then once primed you open it slowly (while monitoring flow from an open faucet somewhere in the system).
Also see:
http://www1.agric.gov.ab.ca /$department/deptdocs.nsf/all/agdex639
- which mentions only putting the priming plug on loosely so that you can monitor for the presence of air in the system while attempting to prime. I've never needed to prime our system in the three years we've been here, but that sounds like a useful trick...
cheers
Jules
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