Re: 1987 Marathon 3PG wont run
after the fuel pump? That's strange - every cart I've seen has a line from the pump straight into the carb, and the fuel filter is BEFORE the pump ... I'm woundering if it wouldn't be worth carefully disassembling the pump to see if there's some debris interfering with the diaphragm, if there's no filter before it ...
And I would be SURE you have the system primed correctly if you are running a different tank - same deal, wrap the inlet with a rag and blow into it to pressurize.
The pulse pump (depending on the type you have) either runs direct off the crankcase pressure, or on some styles there is a short hose between the crankcase and the pump, if you have that style it wouldn't hurt to ensure the hose isn't cracked, etc because that would definitely replicate your symptoms
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