Chain saw - fuel squirting from gas cap vent

[snowmanhat]

I have a 1 year old 18" Wild Thing chain saw which worked great for the first 1-2 hours now it runs irratic so I opened the gas cap vent with a pin after reading some posts. Now it runs no better and gas squirts from the vent on the gas cap when running.

What should I look for next please

[KE4AVB]

By opening the cap vent it will leak fuel now. It is a one way check valve letting air into the tank but not out which now fuel can come out with the air. You will not need to replace the fuel cap. Correction should have said "you will now need to replace the fuel cap.

On the running erratic can you give a little more description of the problem? ie. it is stalling on acceleration or runs goods cold but fails when hot.

These Poulan saws are low end chainsaws so any major repairs usually will kill them cost wise. I have had several here that it was just about cost for a new carburetor as it was for the kit.

A few had destroyed cylinders on Poulan Pro and Craftsman labeled ones (same saws just different case colors) from running too lean. If it is one the ones I thinking about the piston is a NNC plated one and cylinder is plain aluminum. Probably can be upgraded to a NNC cylinder with a plain piston so the steel ring won't wear the cylinder so much.

[okie]

By opening the cap vent it will leak fuel now. It is a one way check valve letting air into the tank but not out which now fuel can come out with the air. You will not need to replace the fuel cap.

Kev---Did you type correctly or should that be "you will now need to replace fuel cap"?

Travis

[bgsengine]

By opening the cap vent it will leak fuel now. It is a one way check valve letting air into the tank but not out which now fuel can come out with the air. You will not need to replace the fuel cap.

Kev---Did you type correctly or should that be "you will now need to replace fuel cap"?

Travis

Yeah.. maybe need more coffee.. one little letter of the alphabet makes such a big difference...

[KE4AVB]

I have been having a lot bad headaches lately and the pills hadn't kicked in. Having days were I see multiple images. The last 6 days been just one big headache. Feeling better today.

Yes I meant "now".

[snowmanhat]

Thank you - is the gas tank suppose to have positive pressure when engine is running? The gas is really squirting out under alot of pressure.

It runs ok at high rpms but a bit slugish. Runs good enough to cut as long as I don't put too much pressure on the bar against the wood. The problems is mostly at starting. choke for first pull and it will fire but not start. no choke for second and many more pulls and it will sometime start other times no go. No matter how many times I prime the bulb it seems to have no effect. Air bubbles in the primer bulb, is this normal. Plug dry upon inspection.

Thank you for helping

[KE4AVB]

Yes positive pressure is normal. Have you put fuel in a bottle and shook it up? It pressure even this way.

Sounds like the carburetor at least need adjusting running too lean. I have seen one low hour saw here that required a new carburetor for the carburetor was just a little more then the repair kit.

[Deere2me]

Thank you - is the gas tank suppose to have positive pressure when engine is running? The gas is really squirting out under alot of pressure.

It runs ok at high rpms but a bit slugish. Runs good enough to cut as long as I don't put too much pressure on the bar against the wood. The problems is mostly at starting. choke for first pull and it will fire but not start. no choke for second and many more pulls and it will sometime start other times no go. No matter how many times I prime the bulb it seems to have no effect. Air bubbles in the primer bulb, is this normal. Plug dry upon inspection.

Thank you for helping

No effect on what?? All the "primer bulb" does is suck/move the fuel from the tank, thru the carb and return the fuel to the tank. Its main function is to purge the old fuel from the carbs metering chamber and introducing fresh fuel to the system. It is correctly called a purge bulb, but is commonly called a "primer", same, same.
Now, having a constant stream of air bubbles is not normal and indicates either a hole/leak in the fuel line feeding the carb, an air leak in the hose coming from the carb to the primer ( if a remote bulb, which is what yer saw has) or the carb has a leak in it somewhere, could be the diaphragm, or more commonly, a leaky main nozzle check valve. Nowadays the hoses/lines tend to deteriorate pretty quickly, so check em'.

Get that squared away and then you can try adjusting the carb. I'm thinkin' you need the " spline" type tool on that unit.

[snowmanhat]

Thank you very much for your help

"no effect" I was refering to it starting with or without pushing purge bulb.

Thanks again for you input I will check those items