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Air bubbles in an ECHO trimmer primer bulb.

Replaced fuel lines with echo kit for this trimmer, could not get all air bubbles out of primer bulb. Hand primed thru carb to motor will start but runs a 50% power after a half hour of running sometimes goes to 90% power. Changed carb new same problem, gas does come thru return line but can't get all the air out of the bulb. Missed something but I don't know what. Carb is simple one no adjustment screwspower jet

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Posted on Jan 02, 2017

  • 199 Answers

SOURCE: 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.

Posted on Jun 10, 2009

  • 16 Answers


Check the carb jets, they might be a gummed up!

Posted on Aug 25, 2009

  • 200 Answers

SOURCE: Craftsman weed trimmer primer bulb is working in reverse

Make sure the line is near the botto ofthe tank.Thanks you for asking and I hope it helps.Please leave me a 4 thumbs up.

Posted on Jul 20, 2010

  • 10 Answers

SOURCE: craftsman weedwacker 358.791070 stopped running; found broken fuel line in tank; changed same;when pumping primer bulb,the line between tank and carb fills up but line between bulb and into return lin

the filter on the end of the line in the tank may be clogged or the gas cap may be bad they are designed to hold pressure and help push fuel in to the carb

Posted on Feb 28, 2012

Testimonial: "confirmed what i suspected original problem was and the broken line,bad filter was what stopped engine by allowing air into suction feeding carb. THANKS"

  • 7482 Answers

SOURCE: PB 200 Echo only runs on full choke. Won't prime. I replaced everything in the carb and a new filter and lines. Getting air somewhere.

Hi dbooth
Make sure your fuel lines are connected correctly.
Check the drawing below
Please rate me

Posted on Oct 11, 2012

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An air bubble may stay inside the primer bulb after starting the motor. But if you see foaming or churning fuel coming into the bulb you may have an air leak in your fuel line. This usually occurs inside the gas tank because the line becomes hardened from alcohol exposure and then the fuel clunk moving the line around causes a split near where the line passes through the tank body. Believe me....the break will get worse and one day you wont be able to keep the motor running. So now would be a good time to size up the fuel line and pick up replacements. You can swap the lines yourself with a little effort and you will save money too. Bonus!

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