craigteffe - there are two screens (at least) that I know of. The "inlet" screen *is* on the OTHER side of the carb, and you are most certainly correct. That one would be the FIRST one to 'gunk up'.

The one that I pictured and described is the "metering" screen, and it's the "other" screen that can get crud.

cambo - after you have finished on the diaphragm side, I'd follow craigteffe's advice and do the same thing on the INLET screen.

My bad for not pointing you there first; perhaps I should have done that.

Thanks, craigteffe for pointing out the misdirection. Hope there's no harm, there.

[Edit - added pic of inlet screen from Walbro manual. This is on opposite side from diaphragm/metering screen, as craigteffe pointed out. On our carbs, a single screw through the center with a large slotted/phillips head holds the pump cover in place. The pic shows a carb with a 4 screw setup]