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String trimmer won't start. How do I flush the

String trimmer won't start. How do I flush the fuel?

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  • 486 Answers

To flush system
Drain tank, use primer bulb to push out fuel in the lines, refill, use primer to bring in fresh fuel. You may need to pull the rope a few times with the choke on, and then push the primer several times again. Sometimes you may need to put a few drops of fuel into the throat of the carburetor to help it start to fire.
If the problem is severe enough, you may need to remove the carb to disassemble and clean. I have listed a few things to check.


Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

Posted on Nov 12, 2009

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Posted on Jan 02, 2017

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