I'm not sure what engine the 648 has... I know on my 646's the Onan was fed via a vacuum powered pump. My first machine came with that pump replaced by a little electric unit. My second came stock. The second was a PITA to start all the time, so I replaced the pump and hoses, etc... Still sucked until I went to an electric pump. Yes, I know you shouldn't need to do that, but I also get tired of fighting with a system that should work, but somehow doesn't...
I probably don't need to tell you, but you're really going to want to drop the hoe, and subframe/counterweight to work on the forward/reverse linkage. Any wear in the banana plate, and ball joint fittings in that linkage will have a significant effect on the travel function. If it's cranky I'd just start right off with a new banana plate.
There are a couple different specific forums out there dedicated to the Case garden tractors, and 64x machines. The wealth of knowledge there is invaluable, and they're also excellent at sourcing parts, which is becoming harder...
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