When i pour gas in the carberator it cranks up, runs, then cuts off. i've cleaned everything i know to clean. what do i do next?
This is classic fuel starvation, start, if you have not already done by replacing the fuel filter in the tank, if no better replace the fuel hose in the tank up to the carb, if no better remove the carb, under the pump side carb cover ( normally alluminium ) here you will find the an internal filter, clean or replace, if the pump diaphram curls up then replace, remove the metering side cover of the carb, check the metring lever here moves freely and lifts the needle, when re assembling on the metering side the gasket is used as a spacer so must go on first then the diaphram and cover, on the pump side the diaphram must go against the carb body followed by the gasket and cover, re set the jet screws to one and a quarter turns out from closed, if the saw is still not starting it is most likley a massive air leak, check the manifold between the cylinder and the carb for cracks, splits or loose, replace the crank seals, replace the cylinder base gasket
SOURCE: poulan chainsaw wild thing
Remove the spark plug and squirt a little bit of the fuel from the gas tank into the spark plug hole, replace the spark plug and crank it over several times.
If it runs, or tries to run... that tells you that your engine, ignition system and gasoline are good (or atleast good enough to get it started)
Next check your fuel line and the primer ball. Make sure that when you pump the primer ball that you can see it pumping fuel through the fuel lines in ONE direction only. (It's kind of hard to see, you might have to start the test with empty fuel lines).
If that fails, you need a carb kit because that's where the check valves are. (unless your primer ball is cracked, broken, or clogged)
Next check the metering diafram and needle in the carb. If the diafram is hard (not easily flexible) or if the needle valve is stuck shut the engine will not be able to get the fuel that it needs to run.
If the Needle valve is stuck, just clean it and it'll most likely be fine.
If the diaphram is hardened, you need a carb kit.
If all the above is ok and it still doesn't work... check the gasket at the base of the carb to make sure that the posative pressure pulses from the crankcase are able to make it through the little holes into the carb (that's how it pumps fuel into the carb).
That's pretty much all the easy stuff. Keep in mind that a new carb only costs about $28 at most places.
SOURCE: chainsaw will not idle without cutting off and
Try adjusting the low speed jet.Or rebuild or replace carb.
SOURCE: once chainsaw has been cranked
IF PUSHING IN THE CHOKE MEANS SHUTTING THE CHAOKE OFF THEN IT WOULD MEAN THAT YOUR CARBURATOR JETS ARE PROBABLY PLUGGED OR IF YOU HAVE A HUSQVARNA YOU MAY HAVE ROTTED CRACKED RUBBER FUEL LINE.
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