![]() Rotate the throttle lever on the carburetor to fully open the throttle. Reinstall the throttle cable to the carburetor. If the primer bulb fills with air (hardens) and wont allow further priming you have plugged (and identified) the RETURN port.Ĭonnect the INCOMING fuel line to the INTAKE port on the carburetor.Ĭonnect the RETURN fuel line to the RETURN port on the carburetor.Ĩ. If the primer bulb softens (deflates) without returning to its original shape you have plugged (and identified) the incoming port. Plug either one of the carburetor ports with the tip of your finger depress the primer bulb several times. Make note of this fuel line for use in the next step. The filter will be attached to the INCOMING fuel line. Remove the gas cap and locate the fuel filter. Reconnect the fuel lines to the carburetor. Secure the primer pump cover and the new bulb with the (4) screws. Install the primer pump cover over the primer bulb. Install the new primer bulb onto the purge base assembly. Remove the (4) screws from the primer pump cover. Sometimes, the gasket will remain affixed to either the carburetor or the intake insulator block.) Typically, the gasket will fall away from the two components as they are separated. (This gasket is situated between the carburetor and the intake insulator block. Locate and remove the intake insulator gasket. Use a wrench to loosen the throttle cable adjusting nut.ĭisconnect the throttle cable from the throttle body.ĭisconnect the (2) fuel lines from the carburetor. Remove the air cleaner case (along with the bracket and the screws) from the engine. Remove the air cleaner assembly.ĭrain the fuel before servicing the unit. This article provides step-by-step instructions for removing and installing the primer bulb on an Echo SRM-225 trimmer. Fortunately, replacing the primer bulb is very easy to do. Over time, the primer bulb may begin to deteriorate or crack. This also removes air from the carburetor, which helps the engine start more quickly and easily. Its purpose is to prime the engine for starting by pumping fuel into the carburetor. The primer bulb (also known as the purge bulb) is part of your trimmer's carburetor. Whether you are a legendary landscaper or a weekend weed whacker, provides the parts, procedures and facts you need to fearlessly fix what fails you. Primer bulb past its prime? It's time to face the fix.
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