The fuel filter of the golf cart is designed in such a way that the motor operation does not get affected when the fuel filter is half full.
If the fuel tank is empty, there is likely to be a problem in the vacuum tube that connects the crankcase and the fuel pump.
The tube may either be completely damaged or have just a hairline crack that drains off the fuel.Consider replacing this tube.
Also, check to see that no other tubes connected to the fuel pump are cracked. The clamps on all the connections must also be intact.
If the fuel filter is empty, disconnect the fuel line coming from the carburetor followed by a turnover of the motor. This should release a stream of fuel.
After this, consider pulling the vent out and sucking through it. This will help to clear blocks in the vent if any.
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