Hi and welcome to FixYa, I am Kelly
I have been searching for a while now and know exactly why you came to FixYa for help. It is like a mystery as to where your primer bulb is even online!
Model number for the ST-155 is
UT-20539-D
Look on the top or the bottom of the carb for a soft rubber button. Depress it not more than 2 times.
What is even more frustrating is... the carbs for this model are from 2 different manufacturers. One being ZAMA and the other being WALBRO. They are similar but the parts are not interchangable.
http://www.plattproducts.com/catalog_international_zama.pdf
I have been helping people for quite some time now and this was one of the most frustrating searches. Not your fault... Just the manufacturer seems to want the location to be a huge secret.
I tried to find an owners manual for the ST155 via company websites also.. no joy!
Thanks for choosing FixYa,
Kelly
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