Question about Echo Genuine Primer Bulb For Any Srm Series Trimmer

3 Answers

Press the primer bulb and all it does is blow bubbles in the tank

I have replaced all the gaskets and primer bulb base., fuel filter before I replaced them the primer bulb was hard to push and no fuel flow at all. engine would start and run for a second and then die won't accerlate at all falls flat. Now the engine will start after many pulls but fall dead and will only run on choke. I even took another one apart to make sure everying in the right place. So now Iam between a rock and a stick of dynamite.

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  • bsxan Apr 27, 2010

    Howdy that would be nice if it had a float it's a diaphram operated needle. I pulled it out and it looked good it shut off and opened up seemed to have the same amount of stroke as other carbuerator I have. blown all the holes clear and even tried to move the little fuel pump valve gasket to same side as the plastic primer base and that didn't work at all. So far it's giving me a huge headache and afecting my spelling lol.

  • bsxan Apr 28, 2010

    did that already think dynamite the answer now but I will keep trying


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Hello,there is an air leak around the float bowl gasket or venturi tube that is why the primer bulb does not pump fuel to start the engine.If your engine is equipped with a metal float, check the float level. If fuel is maintained at a lower level than specified, even a working primer will not deliver fuel up the "extra" distance in the venturi tube.

Some owners clean their carburetors with spray cleaner and fail to replace the viton needle seat. If the needle seat swells up from the carburetor cleaner, the fuel level in the float bowl will be maintained at a lower level and again, the primer action will be affected.
thanks for using fixya,

take care.

Posted on Apr 27, 2010

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Did you change the fuel line? Sounds like it is sucking air.

Posted on Apr 29, 2010

  • Adam Halfhill
    Adam Halfhill Apr 29, 2010

    Diaphram... well, it's story time. Had a old 70s golf cart. Thing wouldn't open up. Give it gas and sputtered out. Ran with some power if you choked it. Changed about every part I could in the carb... no good. Sold it to a neighbor for $100 and he changed the muffler... works like a champ.

    Point of my story. If it looks good... it probably is. Have a beer and relax for a bit, stress kills. I hope you get the right answer to your question. Best wishes.


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Hello bsxan.

You will need to pull the carburetor apart and clean out the small ports and jets as they are plugged up.
You may need to remove the small "frost plugs" that cover the tiny holes that allow the fuel into the venturi as well.
Make sure the needle valve isn't sticking in the seat too.
I hope your repair goes well for you.


Posted on Apr 28, 2010

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5 Answers

Why does gas bulb collape and does not fill up and which gas line goes to which nipple on carbuerator?

The line with the filter should go to the carb, then from carb to suck side of primer and return to tank from the blow side of primer.

not sure if this will apply to your situation but is just what ive gleaned from experience

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1 Answer

Husqvarna problems

No, it is a return line to the tank from the primer. It sounds like the hoses are reversed. The fuel should flow from the tank via the main fuel line (with the filter)( sometimes the main line is smaller than the return line) to the carb, fills the carb then to the primer bulb, and from the primer bulb back to the tank. With just enough fuel in the tank to cover the fuel filter start pressing the primer bulb. Check for fuel coming out the short hose into the tank. If instead the bubbles come out the filter and the primer goes dry try reversing the lines at the carb and/or the primer bulb and try again until you get the proper flow pattern.

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Hello, I have an Echo SRM-3100 weed wacker 2-cycle that i can start but can't get it to run. i checked the fuel lines and they are clear, i took apart the carb and eveything is clean and in good...

Just to clarify, the purge bulbs actual purpose is to purge the carburetor of air and old fuel and help to pull fresh fuel from the tank to the carburetor. Some units have a purge bulb located on the carb and some have the bulb remotely mounted. I think on your model, the bulb is atop the carburetor on the primer base assembly. If the bub doesn't release, then there possibly is a problem in the fuel tank fuel cap vent. Check the cap and make sure the little duckbill vent is clean and clear. A vapor lock type situation can develop when atmospheric pressured air can't enter the fuel tank. You may also want to remove the purge bulb cover and the bulb and spray the top of the primer base with WD-40. You can remove the fuel lines and spray some into the carb as well. This will maybe clean and lubricate the sensitive check valves that may be sticking in the carburetor, causing your problem. Try this more than once if it doesn't seem to help at first. Internal check valves control fuel flow in and out of the carburetor and they do occasionally malfunction.

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2 Answers

Primer button on homelite gas trimmer

It's possibly the filter, can't help there. I would check for a split line or loose connection between the tank and bulb and even splits in the bulb itself.

Apr 24, 2010 | Homelite Mighty Lite Lawn Trimmer

1 Answer

No gas when you prime it

1) Check fuel lines from tank for cracks, fuel filter in tank, primer bulb for cracks

2)Remove Carburetor
replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
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Nov 13, 2009 | Craftsman Garden

1 Answer

Homelite ST-185 (15039A). Route new fuel line.

If you look closely there should be 2 holes in the fuel tank, also if you look inside the fuel tank there should be some remaining pieces of the fuel line and a fuel filter. If this has been sitting for any length of time you will also want to replace the fuel filter.

Now comes the fun... or a challenge

To start with you will need 2 sizes of fuel line ( go to a small engine repair shop) while you are replacing things you may want to buy a new primer bulb also.

to insert the fuel lines into the tank you will have to cut a tapered tail about 2 " long so that you can grab the fuel line with a needle nose and pull them through and out of the tank so that you can trim off the tapered tails. On one install the fuel filter and stick back into the tank, on the other trim the tapered tail off and pull the line back into the tank but leave about 1" sticking through the tank.

Now hook up you fuel lines to the carb and/ or primer bulb

Fill tank half full with fuel ... now test the installation if it doesn't pump fuel but instead you can hear it blow bubbles in the tank it is simple just reverse your lines on the carb / primer bulb

Retest if it works like it should you are ready to attempt to start it... good luck

Sep 08, 2009 | Homelite Garden

3 Answers

Replacing fuel tank on craftsman edger and other fuel not understand where to hook fuel lines back up?  any diagrams?

ok If you have a Walbro WT series carb "without" a built on primer bulb here it is. First off if the fuel lines disintegrated you MUST disassemble it and clean it out. The MOST infintesimle speck of gas line trapped, can allow good prime and bad operation. OK? Don't be lazy on this. Just be delicate removing the flaps gasket and diaphram. ZAMA GND-12 Is the replacement Gasket and diaphram kit fot that carb. Use a cleaner, compressed air or blow good thru it. OK Now...Primer bulb, Carb, and Fuel tank, re connects: Smaller Diameter line comes from Gas tank (Connect filter screen to this in tank) to the short Straight brass carb connector. Primer bulb suction goes to the bent carb brass connector. If small line brings fuel "in" this other line sucks it back "Thru the primer bulb" and the blow side of the primer bulb sends it back to the fuel tank! So...Small Line brings fuel "TO/IN" carb thru short brass connect on carb. Other carb connect goes to bulb suction "IN", Then primer bulb "Pressure OUT" goes thru the larger tube "back to fuel tank". Trust me I know how frustrating a simple diagram is to find online fo this set up. And if you have a carb problem on top of the hook up uncertainty you got frustration. Not only was online help hard to find (Mfg...etc NFG at all!) My local repairshop in BBrook NJ could not tell me how!!! and thats no lie! Walbro has a "generic" carb diagram but no "hook up info" specifically. Poulan don't list it either. And these things routinly fall to pcs. all 3 of mine crumpled together on yr. 3 of use.

Jun 15, 2009 | Poulan 25cc 2-Cycle Gas Powered String...

1 Answer

Primer bulb won't prime

it sounds like the filter on the fule line is cloged try to remove the filter and then try to prime the trimmer. it it does you need to replace the filter. just about any filter that will fit will do.

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1 Answer

Fuel lines replacement

The larger of the 2 lines is the pick up/filter line - the smaller is the primer feed line that goes to the pressure bubble...The fittings are different sizes so it should be simple. To test it , with the hose out of the the primer will blow air out of the line...

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2 Answers

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no, the overflow line does not need to be submerged. first make sure that the hose connections are tight and the "O" ring or gasket inside the gas cap is not damaged or missing. when replacing both lines at once, its easy to get them mixed up, so make sure they're not. remove the carbuerator and inspect the gasket; it should be soft and flexible, if its hard or brittle it needs replaced. it doesn't take much to clog it, so spray carb cleaner, available at local auto parts store, inside the fuel rails and blow out with compressed air. there might also be a pin hole or bad seal in the primer bulb and need to be replaced.

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