The
fuel lines may have become airlocked.This can happen if the tank is run dry. If the saw has a primer bulb,
alternatively press it several times and then try to pull start the
engine with choke on. Repeat this several times. The primer bulb should feel spongy
and fill with fuel.
If you're up to it, you can dismantle the carburettor and
clean any dirt from valves.The carburettors on chainsaws, hedge cutters
etc are very fiddly with delicate diaphragms, valves and springs so you
have to be careful to avoid damage or loosing parts.
Ensure
air filter is clean. Foam elements can be washed with hot water and
detergent, squeezed dry in a cloth and re-oiled with a teaspoon of
engine oil spread through the foam. Paper elements can be cleaned with
compressed air blown from the inside of the filter but ideally should be
replaced.
Check fuel lines aren't kinked or blocked restricting fuel flow.
Ensure fuel filter isn't dirty. This is probably located at the end of the fuel line in the tank.
Check the throttle cable is actuating the throttle plate in the carburettor.
Check whether there is a vent on the tank or on
fuel cap. There is usually a valve on this to allow air into tank to
replace fuel as it leaves for the carburettor. Ensure this isn't
blocked.
Hope this helps !
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