Stihl FS76 Trimmer

[Vikestand]

My FIL was going to pitch this trimmer, it would bog down when throttled up and he bought a new one.

No problem. I took it and bought a whole new aftermarket carb off amazon. Cleaned it up and put the new carb, lines and filter on. It ran great for 25 minutes then it slowly bogged down and died. I could hear a wears gurgling sound from the carb so I pulled the air cleaner off and there was fuel running straight into the carb. The bulb would whistle and no suction. Alright so it was just flooded and had a bad bulb.

Replaced the bulb and it primed it right up. Ran for a minut then bam same issue. Bulb won't prime now.

Thoughts?

 

[StihlKicking]

If the bulb won't prime 3 things come to mind.
1. Bad bulb (yes new ones can go bad)
2. A poor seal somewhere preventing prime.
3. Fuel restriction between the bulb and supply.

Hope this helps


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[Fishnuts2]

I had a similar situation on my FS85. I ended up reusing the old primer block and bulb on the new aftermarket carb. Runs fine now.


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[Vikestand]

I'm almost embarrassed to say what it was. The return line was long enough to suck gas for awhile so it would run just long enough that it seemed I had the lines the correct way.

I had the lines on backwards.

I need coffee.

 

[rustynut]

use the long straw with that coffee..........