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Not trying to troll your thread or anything but there will always be a series of context questions asked to get an idea of where to begin, had to start somewhere. I'm far from a 300 expert but that does seem awfully noisy.
Haha, no worries. I've been an aircraft mechanic for 10 years now, and anytime a pilot reports a problem my first question is always "Did you turn the system on?". No dumb questions when troubleshooting.
After I posted this, I took the truck out on the highway for the first time. The noise significantly decreases when I shift into 3rd. It's definitely running rich, maybe it's just idling too high?
Idle the thing down so you can here what's going on. If it won't idle down then you've probably got a vacuum leak. It sounds like maybe some valve train noise at this point.
that was my first thought as well. just fixed a vac leak in mine this weekend. same sort of thing, it wouldnt settle down. 300 idle is pretty slow and chunky when its right. that sounded more like half throttle or more.
check your choke as well. if its still engaged after it reaches temp, that would create both a rich mixture and higher idle than preferred.
Set the idle back down to about 500 or 600 RPM or so, that thing is wound out pretty good.
Pickup a copy of the Ford Truck Shop Manual for your truck, a test light, voltmeter, vacuum gauge, tach, and a grease gun and you'll have a good start.
So after poking around it seemed the carb was just set to have a really high fuel mix. When I tried adjusting it to a normal level the engine would just splutter and die. I hooked a pressure gauge inline, and sure enough, fuel pump wasn't even registering any pressure on the gauge, and a volume test gave me like 4 ounces of fuel in 30 seconds. So I swapped out the pump, fixed the fuel mix on the carb, and everything sounds much better now.
However, I'm a gorilla and did this when I was removing my pressure gauge,
Any idea where I can get a new one of these adapters? It was connecting the fuel line to the carb inlet. It appears to be 5/16" compression female to 1/8" npt male. I tried three auto parts stores in town and two hardware stores and nobody even stocks that combination of threads.
