Poulan CVA Chainsaw squirts gas out of gas cap at high rpms

[joej68]

Hi All,
My Poulan CVA chainsaw has started to leak gas out of the gas cap vent hole at low rpms and squirt gas out when reved up to high rpms. I tried two different gas caps and it still does it. I am in the process of getting the carb (Walbro WA 19A) rebuilt but I am at my wits end. Any ideas or suggestions are most welcomed.

 

[redunshee]

Hi All,
My Poulan CVA chainsaw has started to leak gas out of the gas cap vent hole at low rpms and squirt gas out when reved up to high rpms. I tried two different gas caps and it still does it. I am in the process of getting the carb (Walbro WA 19A) rebuilt but I am at my wits end. Any ideas or suggestions are most welcomed.

What model Poulan? Some models have a duckbill valve in the cap that prevents fuel from backing out. You say CVA. Is it an S25CVA? If so, it needs a duckbill valve.

 

[joej68]

What model Poulan? Some models have a duckbill valve in the cap that prevents fuel from backing out. You say CVA. Is it an S25CVA? If so, it needs a duckbill valve.

It is a 25CVA. I ordered the duckbill valve from Ebay as suggested. I will let everyone know how I made out with it. Trying to locate a Walbro WA-19A carb kit but can't find a specific part number. Going to try local lawnmower shops today. Appreciate all the help you folks have given me.

 

[Mac88]

It is a 25CVA. I ordered the duckbill valve from Ebay as suggested. I will let everyone know how I made out with it. Trying to locate a Walbro WA-19A carb kit but can't find a specific part number. Going to try local lawnmower shops today. Appreciate all the help you folks have given me.

I found them on ebay, "minibikepartsandmore", around $13. I can't personally vouch for their parts or
service.

 

[redunshee]

Carb kit is KT-WAT. Be sure you save and compare old diaphragms and gaskets to the new ones as the kit provides extra parts for other walbro carbs.