![]() The two ports on the back of the bulb are of different lengths. You can easily find primer bulbs in your local hardware store or on amazon. If there is a problem with the primer bulb, then replace it. Check that on pressing the bulb, it pushes out fuel from one tube, and on release, it sucks in fuel from the other tube.Make sure that the pressing bulb is completely fine, and not broken.Give the primer bulb a little push from the back and it will come out.Remove the tubes coming from the fuel tank to the primer bulb i.e., the fuel lines.Check the Primer BulbĪ broken primer bulb is a very common issue for a string trimmer that is not starting. Check the Fuel LineĬheck the tank and make sure that the fuel line is placed properly. The point where the fuel line comes to the tank is where the filter should be sticking up. Once done, try starting the trimmer again, if it still doesn’t work, keep reading. There are 4 screws holding the cover at the back of the trimmer, in place.If the compression is fine, then it’s time to move on to the next step of diagnosis. In this situation, you should consider replacing the piston ring. However, if the compression is less than 100 psi, that means the engine has worn out. Any level above 100 psi means your engine can run fine. You can use a compression tester to check the compression. Check for Compressionīefore you put fuel in your trimmer, try to power it by pulling its rope, in order to check the compression, If the engine fights back fine, then there is compression in the trimmer. Once you’ve tried to start the trimmer in the correct way and it still won’t start, then it’s time to diagnose the problem! 1. Next, wait for about 30-60 seconds and move the lever to “3”. Once the engine starts, release the throttle.Pull the rope again about 5 times to start the engine.Make sure your throttle is still squeezed.Squeeze the throttle trigger and keep it that way for the next couple of steps.Refer back to this image if you get confused about any terminology! In case you don’t know how to start a trimmer, here’s a quick guide! We have discussed how you can check the primer bulb, as well as clean the carburetor in the following section. If the fuel is not able to pass through the carburetor, the trimmer will not be able to start. Another common problem is a clogged carburetor. It can be due to a faulty primer bulb that is pumping that isn’t pumping the correct amount of fuel for the trimmer to start. There can be multiple reasons as to why your trimmer isn’t starting! Connect the Carburetor back to the Engine.In case you don't know how to start a trimmer, here's a quick guide!.
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