That's a good deal. The one I got for $100 came with a few hardware bits and a filter. Can't remember the site and too lazy to google it.
It's somewhere on the search function though.
+1 on the Walbro.
As for preventive maintenance on a pump. No way, I have seen to many failures almost immediately out of the box, same with alternators, water pumps, and many others. Besides, I upgrade pumps to often.
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What is a good pump for 400-420 flywheel hp rating?