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My Homelite ST 155 gas trimmer is hard to start

When it does start it dies when I pull the acceleretor. I know it needs adjustment, but I don't know how to do it. Is there a Web site where I can get a repair manual for free.

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  • Samuel Charles Spriggs May 11, 2010

    Don't know where you can get a free repair manual, but, have you tried running it with the air filter removed?


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You have a leak on the carburetor. internal or external. the fuel we run now a days eats the gaskets up. gasket set is $8. +tax Easy to do if you pay attention to how it comes apart. The whole kit is a little more plus the little pump ball might be leaking too. Easy fix for most.

Posted on Jun 24, 2009

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Hi I need a priming bulb now I know where it goes where could I get one fron to suit my homelite st 155 with Zamo carb thx

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I have a Homelite ST-155 String Trimmer. It says to prime the unit by pumping the bulb. I cannot find this bulb on the unit anywhere. Please tell me where it is. Thank you

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.

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,

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1 Answer

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do you have adjuster screw's on the carb???

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