Runs then shuts down even after full choke. tried with every choke setting and the same problem crops up. I have cleaned carb, replaced fuel lines re-mixed fresh fuel and installed a new electronic spark module. the plug seemed wet when i shut it off so it seems to be getting fuel. Product is Poulan pro trimmer/edger/blower, m/n ppb100
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If there is a choke adjustment you should set that at full until the trimmer warms up, don't touch the gas. Then repull start at half choke, don't touch the gas either at this time. Then start at no choke, and then set your idle on the carberator with the adjustment screw. Also don't push the primer bulb so many time you will cause the spark plug to get flooded and drown out the spark, which is exactly what is happening.
These are bad about flooding with the least amount of trying to. I usually can get mine started by letting it sit for 5-10 min. push the bulb 3-4 times hold the trigger and push the choke on full with 3/4 speed set. Pull 1x. Don't worry usually it won't start on this setting, it really just helps get the choke and carb set. Put choke back 1/2 way and try to start, if so, gas the trigger a couple of times but not holding in down. If it don't start put the choke on full again and try to start without holding the trigger. It should start after this. Take the plug out replace the coil wire onto plug and pull the cord gently to see if you're getting spark at the plug. Holding the coil boot to prevent it giving a small jolt.
you've got a fuel system issue , most likely carb problem, if this a newer trimmer it will likely need the carburetor replaced or adjusted, also check for cracking fuel lines or signs of old fuel varnish in the tank
You have a few possibilities. Make sure you have good fresh gas in the tank. You're not getting enough gas, so choking helps get more gas than air, making it run better. Could be the carb diaphram (not very expensive if you replace yourself), when they get old they don't perform like they should. Could be the filter in the gas tank is bad, plugged. Also might be just an easy adjustment on the carb Low, and High speed screws. The choke has three positions, full choke, partial choke, and no choke, which means run position.
Are you saying full throttle, or full choke? if full throttle, you should be able to set the idle up. the idle screw will be the one when you give it gas, it will be the screw on you'r throttle linkage. If full choke, maybe the spark arrestor is plugged. You can remove it by removing the muffler.It would be between the muffler and cylinder head. You don't need this to run.I hope any thing I posted will help.
could be but lets try some other things first
On the carb. you have a primer bulb have you pushed that several times and is there gas in the bulb itself?
Are all of your fuel lines intact and not broken or brittle including the primer bulb?
Are you using fresh fuel mixture?
Be sure your stop and run switch is in the run position.
find your air filter and remove the filter itself
then you will be looking at the inlet side of the carb.opening and a orange choke shutter
Take a thimbles full of mixed fuel and pour directly into the carb opening with the choke off( turn trimmer on its side to do this)
now with everything (except for the filter) set to run try to start your trimmer 4 or 5 pulls
does it try to run? runs and shuts off? if so then you have carb. issues
which you can either replace or rebuild
sometimes if you do not want to tackle it yourself then it is less time consuming to replace it
but not cheaper.