battery ground

I have a Oliver 77 tractor is it pos or neg ground? It will run on starting fluid but will not run on gas. It just axlike it is not getting fuel. Clean the carb and it is not running.
 
Positive ground from the factory. Take the line off at the carb and check for fuel flow. Have you adjusted the mixture screws on the carb? Is the needle valve able to open inside the carb? Does it run at all if the choke is pulled?
 

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