So, I have had hard starting issues with a couple of my machines, but only if they sat more than a few days. It ended up being the fuel pumps. There are check valves in the OEM mechanical pumps. In both cases, the check valves had fallen out of the plastic housing. One I rebuilt the pumps with new diaphragms, and staked the check valves in place, the hard starts ended.
I know you have replaced the pump with an electric, so this might not be your issue.
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582, 682, 782, 782D, 1282, 1050, 1210 x 2, 1711, and 1811
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