I remove the hose that goes from the carb to the fuel pump preferably at the FP end and attach a length of hose to the FP outlet. You may need a nipple to connect the hose with. With that set up, place the other end of the hose in at least a 16 oz container. Start and idle the engine for 1 minute or until the container is full. specs are:
minimum volume: 1 pint in 20-30 seconds.
Pressure: 4-6 psi