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What could be the cause of a Tecumseh small HP not priming? I took off the carb, completely cleaned out all the passages, and jets, installed a new bulb, needle and seat, and it still doesn't like to prime. This has happened on more than one Tecumseh carb that I have worked on.

One thing I didn't do was to remove the welch plug. Is there something under there that could be preventing the priming?

Thank you.
 

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Some things to check, the bowl nut(main Jet) can have from 0 to 4 holes the one near the top next to the threads is almost invisible on some, I use the wire from a twist tie to clean it, if the bowl gasket is leaking it will not prime since the primer is forcing air into the bowl if the gasket is leaking there will not be enough pressure to force the gas up the nozzle, on some Tec carbs the outer mounting screw on the air filter adapter screws into the primer circuit and if it is not in place it will not prime. Have a good one. Geo
 
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