How To: Replace Fuel Tank Vent on a Stihl Weedeater

In this step by step tutorial I will give you a full walkthrough of how to replace the fuel tank vent on my FS 131 R Stihl string trimmer. The part was diagnosed as defective due to fuel bubbling out onto the air filter, causing the machine to flood repeatedly.

[@buddymcburnett3011]

Hello, could you tell me your choice of best aftermarket carb for my Stihl FS110 WEEDEATER ? Thanks for your wisdom! ❤

[@StrongTurf]

Honestly they’re all junk. Even the original Stihl carbs are made in China. Whichever carb you buy to replace with I would just make a habit to clean it often.

[@buddymcburnett3011]

@StrongTurf , thanks for your help and response my friend! ❤️

[@SuperMulletguy]

I have the same trimmer and a similar problem. I've been losing power after trimming for a while and have trouble keeping it running. I've replaced fuel filter, spark plug and air filter. When I open gas cap there is a ton of vacuum built up inside the tank which makes me think i've got a vent problem--either a bad valve or plugged hose and its building up pressure/vacuum inside as gas is drawn out. I don't have fuel leaking into air filter though. Where'd you get the filter?

[@StrongTurf]

Got the fuel tank vent from my local Stihl dealer for about $10. They had a drawer full of them. I talked to the service tech and he said these tank vents are a known issue on the 131’s, so I wouldn’t be surprised if yours needs replaced.

[@SuperMulletguy]

@@StrongTurf Thanks for that and for the video. It came at just the right time and I think i'll go find one and switch it out.

[@davidpavshak330]

Just out of curiosity, what year is you date of manufacture? I have a 2019 model 91r same problem for the past 4 years. I’ve always opened the tank to release the pressure but it’s getting old doing this. I’m gonna have to try it out. It almost seemed like a messed up carb or clogged spark guard.

[@StrongTurf]

Mine is model year 2023. I bought it brand new last year and had issues with it from day 1. It’s been a few weeks since I replaced that fuel tank vent and it has been running great since

[@outdoor07]

There is on some models a vent thru the gas cap.

[@shermanhatch2716]

Never drop start your equipment start it on the ground

[@StrongTurf]

Why do you say that? Because it’s rough on the pull-cord? I’ve never had an issue

[@edensgardenshed9622]

I would like to know as well. Strings are cheap and easy to replace. What could go wrong drop starting.

[@taylorfarmer636]

This is by far the worse design Stihl has made! It will keep failing over and over. I’m on my 3rd vent.

[@StrongTurf]

Agreed. Buddies of mine keep trying to get me to switch to Echo trimmers, but Stihl equipment is all I’ve ever used. Maybe I’ll make the switch one day.

[@drumpogrom]

@@StrongTurfI wouldn’t. I work at a park and a lot of the echos we have are insanely underpowered. It’s all preference though obviously. Stihl KM131R is my fav machine ever made.

[@willstrong7911]

@@drumpogromI agree Stihl makes a good product. I feel like most issues people have with them is due to improper maintenance

[@drumpogrom]

@@willstrong7911 yep likewise, or from running fuel with ethanol in it