The new carb is a chinesium Aisin clone. It is the correct carb, and the mixture settings weren't changed from "as assembled". Yes, the carb is installed correctly, with all connections secured.Choke and foot on floor do not correlate well. The choke is restricting air at the top of the air inlet, then you’re trying to let more in at the bottom.
What do you mean you switched carb? Is it still an Aisin? Is it correct for your year? Is it new, rebuilt, off a known running engine, etc?
Need to know what carb is on it and the condition. Then, what settings as far as mixture screw, vacuum sources plugged or hooked correctly, etc. Pics may help.
No, we've gone from "start, runs a few seconds, then dies" to "cranks, but doesn't start".You’ve reached the stage of troubleshooting where I would start hitting the motor with a hammer. But just to save other people time… you said that the truck starts, but in your last post “still no starting”. Safe to assume you can still start it with choke?
Fuel level is slightly above the centerline of the sight glass. There is a solenoid, but the connector doesn't match the harness, so I have to install a jumper. As to the rest, I have another project that requires my attention for the next few days. I'll post back when I'm able to get back to it.Where is the fuel level in the sight glass?
Try lightly bottoming mixture screw then back out 2 turns.
Is the primary throttle blade fully closed or open at all? Try opening it small amounts if closed. Try closing it small amount if open.
Is there an idle solenoid on it? Is it working?
Pics would help.