Question about Troy-Bilt 27cc 2-Cycle Straight-Shaft Gas String Trimmer TB80 EC

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Primer bulb wont suck gas or fill up

Can hear air sucked when pushing bulb

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Ryobi 2 cycle gas edger. My primer bulb won't suck any fuel at all. Worked fine last time, a month ago.

change the bulb. it must have a crack in it that wont allow it to suck fuel.

Sep 05, 2016 | Ryobi Garden

1 Answer

Why my weedeater idle to high and why air bubble in the primer bulb?

Its not un common to have air in the primer bulb, Check for a possible air leak in the system. This will make the saw idle higher than normal if its sucking air from elsewhere.

May 19, 2016 | Garden

1 Answer

Two connections on the primer bulb. One side pushes air other side sucks air. Which one goes to carb and to tank.

when you press the primer that side goes to the carb
when the primer comes out that side sucks in the fuel ready for the next press

Jun 20, 2015 | Garden

1 Answer

I replaced the primer button & hose but ball wont prime. whats up

The bulb is connected to the fuel and carb by two small hoses usually clear or yellowed from fuel..they get brittle and break causing it to suck air and loose it's ability to push gas into the cost but is a little tricky to replace account of close clearance but can be done..if not easy fix for dealer good luck

Sep 23, 2014 | Poulan Garden

1 Answer

How to replace fuel lines craftsman 316.292620

Initially release any clips by squeezing with a pliers and pushing back along the line. Lines can be prised off using a snipe nose pliers or flat blade screw driver, pushing on the edge of the line. Don't pull the lines which can stretch them.Two fuel lines leave the tank of a two stroke engine. The primer bulb sucks gas from the tank via the line with the filter on the end, gas returns to the tank via the other line without the filter. When you replace a line, to check whether they haven't been mixed up, fill the tank but leave the line without the filter above the level of the gas. When you push the primer bulb, gas should eventually squirt out the line without the filter. If the lines are mixed up, air bubbles will flow out of the filter and no gas out the other line.
For a pictorial guide and more info on troubleshooting 2-stroke engines and carburetors, see my guide here:

String Trimmer Won Work 2 Stroke Engine and Carburetor Troubleshooting

May 14, 2014 | Homelite Mighty Lite Lawn Trimmer

1 Answer

I have a 124l e-tech trimmer and the prime bubble wont fill

Sounds like you have an air leak. Either in the primer bulb is split or punctured, hole or leaking fuel line or primer bulb base, and is sucking air instead of fuel.

Aug 20, 2012 | Husqvarna 124L 28cc Gas Line Grass Lawn...

1 Answer

Have a TB20CS that is about a year old. Can get the primer bulb to fill with fuel and prime the carb. Is this a relatively easy fix?

Did you mean "Can or Can't" get the primer bulb to fill with fuel? If you actually meant "Can't" then you probably have a pin hole or the bulb has a small crack in it which is sucking air into the bulb when you depress it. If that is the case, there is a metal flange that goes around the base of the bulb and probable 4 screws that holds/seals the bulb in place. Easy to replace and the bulb can be purchased at most small engine repair shops.

May 13, 2011 | Troy Bilt Tb20cs 2 Cycle 31cc Gas String...

1 Answer


Run a small paperclip into the fitting that the fuel line is attached to on the back of the primer bulb and make sure it is clean. Then go to the other end of the equation and make sure that the fitting is cleaned out on the carb where the fuel line attaches. Hope this helps and good luck.

Jul 11, 2009 | Garden

1 Answer

Routing of fuel lines for a weedeater bv200 type 2. Which lines go where from the carb into the tank?

The line with the filter goes to the bottom of the carb. The other line goes to the outlet side of the primer bulb and the other line from the primer bulb goes to the top of the carb (The primer sucks gas through the carb).
Good luck!
Ps. if you are not sure which nipple of the primer is the outlet port then put your finger on one of the ports and push the bulb. If the bulb stays ridged then that's the outlet and if it collapses but doesn't fill but up then that's the inlet side.

Jul 10, 2009 | Garden

1 Answer

Stihl hs 45 hedge trimmer primer bulb will not **** gas into it when pressing

trace the llines from the primer bulb and check them for leake it is sucking air from somewhere either the lines or the bulb

Apr 28, 2009 | Garden

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