Yep! Buy an overhaul kit, with the new diaphragms and other parts, thoroughly clean the inner passages, and rebuild the carb with the new parts. The old parts may look perfect, but after MANY days of pumping, the diaphragms do wear out. And, change the fuel filter, too. To change the filter, hook it out with a homade hook rod, and install the new one. DO NOT allow the fuel line to plop back into the tank without the new filter on it--guess why---!
There is usually some numbers on the flange or side of the carb casting that you will need to know to get the correct parts. The carbs may all look alike, but they ain't!

Well I installed a new carb. it was only a few dollars more than the rebuild kit. Same problem. It seems like it is getting air from some place. Could it be sucking air from the lower crank seal? Any Suggestions.

TIA
Bob

I know I probably shouldn't say this, but I will anyway.

Why bother to fix this junk in the first place?

Go to Sears and get a new one, preferably when on sale.

If unit dies after warranty has expired, repeat.