Reviving the Old Style Stihl String Trimmer: A DIY Challenge

As I approach my upcoming lumbar fusion surgery, I've been contemplating biting the bullet and investing in a new straight shaft Stihl trimmer. However, with the cost of $219 still out of pocket, I decided to take on the challenge of reviving my old FS76 string trimmer instead.

The first step was to inspect the fuel system. Upon examining the tank, I noticed two tubes entering into it, which seemed to be connected to the carburetor. I assumed these were vent lines from the old tank to the carb and connected them accordingly. Next, I replaced the fuel cap with one from my later model curved shaft Stihl trimmer, thinking that a clogged vent might be preventing proper airflow.

Despite these efforts, the engine still starved for fuel when the cap was tightened. I suspected that creating a vacuum by tightening the cap might prevent fuel flow from the tank. To alleviate this issue, I ran the refitted trimmer with the gas cap loose, which allowed it to run smoothly.

With my back damage requiring a longer shaft trimmer for occasional use, I decided to upgrade some components. I replaced the old tank with a new factory one and acquired a new carburetor from Amazon (which turned out to be a Chinese copy).

As an amateur mechanic, I'm not an expert in small engine repair. Nevertheless, I'm eager to find a solution to get my trusty old Stihl trimmer running smoothly once again. If you're facing similar challenges with your own vintage string trimmer, I'd love to hear about your experiences and share any lessons learned along the way.

About the Author

The author is a retired Registered Nurse, toolmaker, and do-it-yourself enthusiast. With a passion for DIY projects and small engine repair, they hope to inspire others to take on similar challenges and revive their own old equipment.

Old style stihl string trimmer