Its difficult to say. The comment I made earlier about debris in the pump may not be from poorly filtered fuel. It may be a result of the gear faces wearing inside the pump head, which would tend to point towards needing a new pump. I've had this happen on a few different pump brands over the years. From your description of its accumulated run time, this pump should still be working fine though.

That being said, 0C is pretty cold and there's a chance the shaft seal is getting sticky. What is the pump voltage you're seeing once the engine has started and calibrated the idle speed? A healthy pump should be around 0.8V. If its approaching 1 Volt, you've got a restriction in the system or the pumps' not healthy...

Regardless, I'd recommend contacting Flightworks ([link=http://shopping.netsuite.com/s.nl/c.ACCT103531/sc.5/.f]Contact Link[/link]) and ask them about having it checked out. If the engine is still under warrantee, there shouldn't be any cost aside from shipping it to them.

Kelly