Not sure what gets accopmplished with adding a electric pump to a mechanical pump. It's the carb bowl that is evaporating. I would think the gas would stay at the mechanical pump. There is a finger over the straw situation there.
If the electric pump is wired correctly then you have proven it's doing no good. I hope you are pumping pedal as starter turns and full choke.... on these after "sitting a long time" days. You need to get a squirt as soon as there is enough in the bowl.
I think maybe you may start to suspect a bad accelerator pump.
If filter is "right in front of the carburetor" does that mean after the mechanical fuel pump? That is the wrong place. Put it before pump.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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