Still weed trimmer help needed !!!

Crazy Horse · Jun 21, 2017

I've been fiddling with a Stil weed trimmer for a while after it was given to me. Model FS 36 so one of the
small yard type ones. Finally got the ignition problem sorted out and fired it up this afternoon. Starts
and runs OK but after a minute or so of running, I have to pump the throttle trigger to keep it running. It
starts to die and when that happens I give it a few pulls on the trigger and away she goes again. Sound
pretty obvious that it is a carb or fuel problem, any suggestions as to where to start for a fix or
troubleshooting?

wisbaker · Jun 21, 2017

I think I'd look at gaskets and seals, I've had more than one two stroke that had a bad gasket or seal and once it got warm it would start sucking air through there rather than the carburetor, last one was a Poulan weed trimmer that had a bad gasket on the crankcase cover the carburetor bolted to.

guido · Jun 21, 2017

Hello Crazy Horse,

Fuel filter, cracked lines or clogged fuel screen in the carburetor. If you go into the carb, do your self a favor, clean EVERYTHING!

Guido.

Greg1959 · Jun 21, 2017

Simple things first.....Fuel screen on end of fuel line (in tank) could be clogged. Just bend a coat hanger into hook and reach in a pull out fuel line.

Make sure spark arrestor is not clogged. It's on the muffler exhaust.

hth

TimV · Jun 21, 2017

Just one note of caution for Crazy Horse on the fuel filter. Some of the Stihl weed whackers have a stretchy rubber fuel line. Some also have a gas cap keeper that's a round plastic disk with a hole in the middle connected to a chain to hold the cap. Use the hook on your coat hanger to go through the center hole in the disk and pull up. That will make the disk bend enough to come out of tank. You can bend it a bit with your fingers and press it back in when you're done. BE VERY CAREFUL when disconnecting the fuel filter from the stretchy line--if you let it go, it will snap back down in the very bottom of the tank, and without the filter on the end, it is VERY difficult to get it back out--I'm sure you can figure how I know this! I usually take a hemostat and pinch the line below the filter so it stays out of the tank when I replace these filters.

flying belgian · Jun 21, 2017

Might want to check the vent in the fuel cap.

kevinthefixer · Jun 21, 2017

What does the spark plug look like? If you've a half-hour or more runtime on it, should be medium brown. If it's closer to white, try fattening up the high-speed mixture, maybe 1/8 turn.

2x4 · Jun 21, 2017

carb accelerator tube is worn out. Scrap it, the fix is a new one & they are worth more than the machine.

Bret4207 · Jun 22, 2017

Like some of the others said, start at the fuel filter and work to the carb. Could be seals, could be a cracked line, could be a lot of things. Tracking it down takes a little time and effort. If that one of the ones with the primer bulb, it can be that too.

Stroby · Jun 22, 2017

I think Greg1959 has it figured out with regard to the spark arrestor. That's where I'd look first anyway.

Still weed trimmer help needed !!!

Crazy Horse

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wisbaker

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guido

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Greg1959

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TimV

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flying belgian

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kevinthefixer

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2x4

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Bret4207

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Stroby

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