I've bought a new bulb. When I squeeze it, it will collapse. I think I
may check the fuel filter. It was new this spring, but maybe it's got
enough of a clog that the pump can't keep up. When I pump it by hand,
the engine runs great, up to 5500 rpm or so.
I have even tried all new lines from inlet to pump, to pulse, to
filter and to carbs, but no help. I'm hoping I've narrowed it down to
the tank or the fuel filter. It's even hard for me to pump by hand,
maybe that means there is a blockage somewhere. Could it even be the
inlet fitting on the motor?
I'll be testing and troubleshooting some more tomorrow.