Join Date: Nov 2008
Location: Deale, MD
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Give what you have tried, I would check these things, in this order
Check the antisiphon valve on the tank. Probably NOT the problem, since pumping the primer works. But if it is a little resticted, it can cause that symptom. You can simply bypass it for a test, but do replace it.
Let the fuel pump pump into a jar (take the hose loose from the carb). It should pump quite a bit; the manual has a spec, but will be something like 1 cup per minute.
Cover the end of the hose with a finger. Is there some pressure? I recall there is more than one pump for that motor and that the pump can be assymbled backwards (I don't have it in front of me). It's easy to get to so check that work. The pressure should push your finger off the hose (not too tight). Certainly more pressue than the primer bulb generates.
Air leaks. If a gasket or hose is imperfect on the suction side that will ruin it.
I run big Raycors on my 9.9s, so the filter size is not the problem.
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