poulan 3450 chainsaw carb

jim_uny

Member
found dirt in fuel pump inlet side. cleaned out, new gas tank filter and line. started ran fine for 10 minutes and just stopped.
checked inlet and was NOT dirty. gas tank cap does not have vent. what could it be ? spark ok. if i take off gas cap still does
not run. is a walbro HDA carb and performance & starting was ok until it stopped.
 
You said you cleaned tank,new fuel line and filter. Some chainsaws have a fine screen in carb and it doen't take much to plug it. You might want to look into if this saw has one.
 
chris(wa) i opened gas tank and it started aok. will cracked lines cause intermittent problems ? performance is aok.
 

I'm fairly sure that model has a tank vent, not a vented cap. I would check fuel lines and for cracks in the intake boot if it has one, which I think it does. More likely is that the carb is gunked up. Clean it good, check the diaphragm and pump condition.
 
Everyone has pretty well covered the fuel line issue below. I might add to have a squirt bottle of fuel handy and when it quits, spray a bit of fuel into the carb and see if it fires right up. If does fire right up, then I would agree with the fuel line/carb clogged/cracked fuel line/clogged vent and you need to go over the whole fuel system again. If you have to almost flood it to get it to fire or it won't fire at all, I would suspect the ignition unit is weak no matter how strong the spark looks. A weak ignition can show a good spark with the plug laying on the engine but won't spark properly under compression. Before I bought a new ignition unit though, I would have a compression leak down test done to rule out bad crank seals. A motor with bad seals will run fine until they warm up a bit, things expand and then the seals will leak and the motor will quit until the cases cool down, if you are lucky. If not it may just run lean until the motor seizes.
 
Coupla years ago, I had a new Poulan saw, I forget the exact model, a little 14" one. It would run about ten minutes and stop. You'd have to let it set for a half hour, and then it would start right up and run fine for another ten minutes and stop.

Since it should have been under warranty, I took it to two different Poulan dealers and neither one would touch it, saying if they worked on it, they'd never get paid by Poulan. The last one did tell me Poulan had a run of bad ignition coils that would act like that. He even recommended a particular place to buy a new coil online.

Upshot was, I forgot about getting Poulan to cover it under warranty, blew $15, and ordered a new coil. That fixed it. Ran fine with a new coil. I used it some, and when there was a tornado, I donated it to the tornado effort.

So--you might want to consider a coil as your problem.
 
I at one time I had a Poulan weedeater and it had what they called a duckbill valve in gas tank to vent it. I don't know if they used it in chainsaws.
 

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