it is the plastic bowl and I have replaced the solenoid with the screw from the old carb. The mower did not have solenoid in the carb. I have checked compression and it is good. I did have it running fairly well for once with the old carb after I cleaned it, but the next day...wouldnt start without startin fluid and only ran again on full choke. New carb fired right up and ran for a while, but now will only start and stalls out pretty much right away. I have loosened the gas cap also. I adjusted the valves to .004". I agree it would be a fuel problem, but have run out of ideas to try. I was thinking that the flywheel key may be off? Or exhaust port clogged? I got this mower and do not really know how well it ran before. I know it did set outside a bit before I got it and brought it inside for the winter. I've had it running on full choke enough to mow my yard, but now dead in the water.