Question about Troy Bilt Tb20cs 2 Cycle 31cc Gas String Trimmer 17" Cs

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String trimer just changed primer bulb &all carb lines was running before now wont start

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Sounds like air in the system, take spark plug out, pump bulb 3 or 4 times, replace spark plug and try to start. Repeat.

Posted on Apr 17, 2014

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Posted on Jan 02, 2017

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SOURCE: PRIMER BULB ON TROY BILT 144 TILLER WILL NOT FILL

look for a cracked fuel line or a split in the primer bulb

Posted on May 20, 2012

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I changed the primer bulb and now it's not getting


sounds like you hooked the lines up backwards, when you press the primer it is supposed to squirt gas into the tank on the return line cause what it does is draw fuel through the carb and back to the tank....filter line from tank goes to fuel pump side of carb and return line on carb goes to primer bulb then opposite line on bulb to tank...... so when you press bulb it draws fuel through filter in tank through carb and back to tank ! good luck! 2StrokeJim

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Won't start , can not get primer to work even after replacing primer bulb.


If your fuel filter is clean, and none of the fuel lines are pinched, then you probably need to replace the diaphragms, gaskets, and screen in the carb. Some carbs with the primer bulbs mounted on the carb have a check valve in the primer system. This is the least likely problem, but it is possible that the check valve is defective.

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Trying to replace the fuel line and the primer hose both were rotted off not sure what goes where on my poulan pro ppb200 31cc string trimmer there are two lines into the tank the primer wont fill i have...


The smaller line is connected to the fuel filter in the tank and goes on the carb body opposite the end with the hole in the cover. A larger diameter line coming out of the tank is the fuel return line and has the little connector on it just inside the tank to hold it in place there
It goes on the carb body (if primer is on carb) by the bulb.
If there is an external bulb...the small line is the same...there would be a larger line going from the carb body (nearest the end with a hole in the cover) to the smaller nipple on the primer bulb. A third larger diameter line would be connected to the larger nipple on the primer bulb and running to the little nylon connector inside the tank. This is the fuel return line and the smaller diameter line is of course the fuel supply line.

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Sounds as though the fuel filter may be plugged. The filter is in the tank. Take a look, see if it is visible. Remove and replace. Good luck...Lee

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The larger of the fuel lines is the main fuel line. It is the one that has the filter stuck in the end of it and runs out the larger hole in the tank to a fitting on the carb. The smaller line should be about one inch into the tank and comes out the smaller hole and runs to one of the nipples on the primer bulb. Press the primer bulb and put your finger in front of the fittings. The one that you feel air coming out of when you do this is the fitting that runs from the primer bulb to the carb. Hope this helps and good luck.

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Primer bulb won't re-fill.


Not sure about your particular set-up, but there is usually two fuel lines running from the fuel tank. One goes to the carb and the other goes on a fitting on back of the primer bulb. The primer bulb will have a second fitting with a line going to carb. Sounds like either a clogged or leaking fuel line to me. Hope this helps and good luck.

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Poulan 2050 chainsaw. Fuel line routing. Replaced all fuel lines. Primer bulb is marked Tank and Carb side. Tank side is for larger line and runs into tank and fuel filter. Carb side is smaller diameter...


Replaced my fuel lines on poulan 2050 today. The large diameter line is a return line from the primer to the tank. The smaller diameter line is the supply line from the tank to the carb. You need to cut this line and run a second piece of small diameter line from the card to the primer. I'm not sure if it makes a difference which of the two stems on the carb is the inlet or outlet line. I used the top stem as the inlet, and connected the bottom stem to the primer. My chainsaw started right up. So I either got lucky or maybe it doesn't matter.

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