Re: 90 marathon bad fuel pump?
You can check the pump easily by disconnecting the fuel line going to the carb, then turn over the motor and see if it is pumping fuel. Could be bad crank seals, or a float adjustment. If it starts good, likely the crank seals are ok. Another thing to check is the vent on the top of the gas tank. Make sure the vent is not plugged. Check the rubber carb boot for cracks.
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