Well I worked on the delivery valves today. When I started to loosen the first one, fuel came out of the top. So I immediately tightened it back down, and turned the engine over, but no fuel would come out. So I went ahead and took it all the way off. Luckily I didn't lose any parts lol. There's a spring and a couple other small parts, but it all looked quite clean. So I cracked loose the bolt holding the return line and watched the fuel drain down. Then I went ahead and put the valve back on, but left it a turn or so loose. Then I loosened the others slightly, and started to spray carb cleaner into one. To my surprise it instantly came out the other 3. So I sat there and slowly dribbled carb cleaner until it was overflowing all the other valves. Gonna let it sit a few days, see if I can find anymore info, and then get back on it.