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Just to explain: Spinning IS Cranking. Your problem is cranking and not firing/starting.
The codes tell you the cause. You need a good electrician.
The U0141 OBD-II diagnostic trouble code (DTC) on Your Dodge means "Lost Communication With Instrument Panel Module" --- which, as You're aware, is the thing with Your gauges and other displays!
Seems like a fuel delivery problem.
May be a bad fuel pump, clogged fuel filter or a fuel line problem.
What car make/model? What engine?
When it dies, try to turn ignition off immediately, wait a couple of seconds and turn the key quickly to the crank position (don't wait with the key in ignition-on position so that the fuel pump doesn't try to pump fuel into the fuel lines).
If it hesitates to start or runs significantly shorter before dying, you have pinpointed a problem with the fuel system.
Try spraying a couple shots of carb spray down the throttle body while a helper cranks it over. If it starts and runs for a couple of seconds check fuel pressure and the resistance of the injectors.
It looks like you answered my clarification request by posting a new question. Don't do that... keep it here. I inadvertently answered that question, thinking that someone had started a new thread with no information but "My vehicle has a caburetor."
This really sounds like a fuel delivery problem. It sounds like, while the pump is turning slowly during cranking fuel slowly seeps into the float chamber. Then the motor catches, and the fuel flow cannot meet the demand; the float chamber empties, and the truck dies.
I would take the fuel line off the carb, disable the ignition, point the line into a bucket (*like a coffee can), and crank the engine. You should get pretty good flow into the can. If the pump is electric a good steady flow, if operated by an eccentric on the camshaft timing gear (that is, the pump is bolted onto the side of the timing chain cover) fuel in healthy spurts.
My first suspicion is a really clogged fuel filter, and my second suspicion is a bad fuel pump. a hole in the fuel line, cracked hose, etc, can allow sucking air, which can seriously impair fuel flow.
It sounds like it could be the transfer pump. Turn the key on and then crank the engine for about 1 second but leave the key in the run position and listen for the transfer pump to run. It should run for about 15 seconds after you stop cranking. If not, then you will need to replace the transfer pump with a in-the-tank conversion kit if your is mounted on the side of the engine block below the fuel filter housing. If you already have the in-the-tank pump then it might be siezed or the "sock" might be plugged up with alge or other contaminants. I usually lift the bed rather than removing the tank to replace the fuel module. If the check engine light is on you might want to have it scanned for codes to make sure since the modules can be spendy.
this sounds like crankshaft position sensor, my Cherokee was ding same thing it ended up being crank shaft position sensor. this part costs about $50 and is easy to install.
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