Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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The first thing that I would look at is to make sure that the lines are hooked up to the primer and carburetor properly. If they seem to be proper then the other thing to look at is the carburetor diaphragms, when they get stiff or hard they will not pump properly which will cause this issue.
Did you replace the diaphragms in the carburetor when you had it apart?