| If you really suspect the pump, disconnect the line at the carb and put a can or something under the line and crank the engine. Then you can see if your pumping a decent amount of fuel. The manual should tell you how much it should pump on what amount of time.The idle mixture screws only affect idle sothat wouldn't be your problem. Did you put the new carb on before you drove it home? And did you drive it like that without the filter in it? Alot of sediment can collect in a tank since 1969.The lines can even be corrodid and limiting fuel flow.Rochesters have small fuel bowls to begin with, so limiting flow would keep the bowl from having the full amount of fuel in there.When all is running correctly there shouldn't be any hesitation on launch, just a crisp take off...The secondaries can be adjusted when to open by a screw on the side.You'll see a rod coming from the front vacuum pull-off going over the coke thermostat. The rod goes into a slot on a piece of metal that controls the air valve.Move that piece of metal a bit and you'll see a screw. That's the adjustment screw. Holding that screw is a set screw with an Allen head underneath it. You loosen the Allen screw and adjust the other then re-tighten the Allen. Don't turn it much, a quarter turn or less and remember where you started from, in case you don't like your adjustment. The air valve( the plates above the secondary plates) are what control when the secondaries come in.It's an "on demand" set up. |