[wombat]

d'animal was kind enough to point me in the right direction for a chain oil problem i have(chainoil in combustion chamber) i striped the saw down to clean properly and have some questions.
1-which nipple does the oil pickup hose connect to
2-is my duckbill ok or is half of it dissolved
3-is something supposed to be in the venthole in top of tank
see pics

[D'Animal]

The nipple with the double barb is the one that has the duck bill valve connected to it. The duckbill valve goes on the reed or pipe and is located just inside the tank.

The nipple with the single expansion ring goes to the oil pickup body that is in the bottom of the oil tank.

It is a crazy simple system. Piston moves up and down in the cylinder. The movement of the piston pressurizes the crankcase (positive or negative). The positive pressure goes through thought he reed or pipe and pressurizes the oil tank. The duck bill valve allows the pressure into the tank but does not let the pressure out because the "lips" close. The pressure in the oil tank pushes the oil out of the tank through the oil discharge pipe and into the oilpump and onto the chain.

Pressure in a crankcase is rarely over 2psi.

[wombat]

thanks d'animal i get how it works now. that last picture is the gas tank,i went online and found another guy asking the same question so maybe it is normal for that hole to be there or maybe a vent hose fell off?

[D'Animal]

There is a duckbill valve in the hole on the fuel tank.