Poulan Chainsaw Fuel Line Disaster

[igya1945]

I have a nice Poulan 2150 chainsaw and every fuel line has dried up and crumbled. There's a large and small line in top of tank, on the carb and on the primer but I have no idea how to route the new lines. And how do you get the new lines down through the tank? WOW!!!

[30yearTech]

The smaller diameter line is the supply hose for the carburetor. This one should have the fuel filter attached to it and run to the input on the carburetor. The larger diameter line will run from the carburetor to the suction side of the primer bulb, and then from the output side of the primer a small section of the larger hose is used to return the fuel back into the tank.

I usually use a piece of tie wire to pull the hose up through the tank where I can grab it with a pair of needle nose pliers.

Best of Luck....

[igya1945]

The smaller diameter line is the supply hose for the carburetor. This one should have the fuel filter attached to it and run to the input on the carburetor. The larger diameter line will run from the carburetor to the suction side of the primer bulb, and then from the output side of the primer a small section of the larger hose is used to return the fuel back into the tank.

I usually use a piece of tie wire to pull the hose up through the tank where I can grab it with a pair of needle nose pliers.

Best of Luck....

Man, you saved my saw! Couldn't have asked for better instructions! MANY THANKS!!!

[rickman235]

Poulan 2050 chainsaw. Fuel line routing. Replaced all fuel lines. Primer bulb is marked tank and carb side. Tank side is for larger line and runs into tank and fuel filter. Carb side is smaller diameter line and runs to carb but which fitting? Remaining carb nipple with small line runs to tank vent and sticks about 1 inch into tank top. Pushing on primer bulb PUSHES air OUT of fuel filter and sucks from carb side of bulb. Pulled out primer bulb and verified action separately. Definitely pulls from carb side and pushes into tank side which makes no sense to me at all. Going backwards like that would require source of gas to be from "vent" line in tank which isn't low enough into tank and would not be filtered. Can't believe primer bulb is suddenly working backwards. Hope you can help. Thanks. Rick

[cheese]

Rickman, I replied to your question in the separate thread you posted.

[igya1945]

Rickman, I replied to your question in the separate thread you posted.

I'll try to figure out all of this today and let you know what happens. Thanks a lot!

[igya1945]

Rickman, I replied to your question in the separate thread you posted.

Rick, I figured out one thing. The primer pump will work only one way. The "carb" side of the pump goes to a BRASS nipple on the carb and the tank line with the filter goes to the PLASTIC nipple on the carb (the one closest to the carb diaphram). That's the way mine is anyway. If you plug the "carb" side of the pump to the wrong carb nipple, the pump bulb will not expand back out. Hopes this helps.
Now, back to my problem. I absolutely CANNOT get the lines pulled through the tank holes because the fuel lines are so slick, the wire will just slide right off. Any suggestions?

[Denman123a]

Poulan 2050 chainsaw. Fuel line routing. Replaced all fuel lines. Primer bulb is marked tank and carb side. Tank side is for larger line and runs into tank and fuel filter. Carb side is smaller diameter line and runs to carb but which fitting? Remaining carb nipple with small line runs to tank vent and sticks about 1 inch into tank top. Pushing on primer bulb PUSHES air OUT of fuel filter and sucks from carb side of bulb. Pulled out primer bulb and verified action separately. Definitely pulls from carb side and pushes into tank side which makes no sense to me at all. Going backwards like that would require source of gas to be from "vent" line in tank which isn't low enough into tank and would not be filtered. Can't believe primer bulb is suddenly working backwards. Hope you can help. Thanks. Rick

Hi Rick, ... thread is pretty old but others may see it searching like I am. I suspect that the elusive "vent" line actually pressures the fuel tank as it purges the carb. That may even be the essence of the fuel delivery system, that maybe the diaphragm pump pressures the fuel tank to push fuel up the carb line. My Poulan "Pro" 4218 AVX has a third line that runs from near the crankcase to the fuel tank so with a check valve there would be your "fuel pump". Or maybe not. I've studied this thing backwards and forwards for weeks with little to show for it other than massive arm muscle development. My compression turns out to ne 60psi dry and double that with a bit of oil on the piston (wet test) so unless I discover something new I'll be installing the piston ring I bought yesterday. The encouraging thing is my little 16" "non-pro" Poulan runs like a top with more hours on it, and makes 120psi compression. Go figure! ...