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 route the new lines. And how do you get the new lines down through the tank? WOW!!!
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....
Originally Posted by 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....
Man, you saved my saw! Couldn't have asked for better instructions! MANY THANKS!!!
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
Rickman, I replied to your question in the separate thread you posted.
Originally Posted by cheese
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!
Originally Posted by cheese
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?
Originally Posted by 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
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! ...
Igya, this is a lot later, but may be helpful to someone who searches the thread. Your pump is not backwards, your lines are. The LARGER line should run from the bulb back to the tank and just enter it an inch or so. The smaller line runs from the carb to the fuel filter in the tank, and should be long enough that the filter can fall to the bottom of the tank. The pump actually pushes air from the bulb to the tank, then refills - drawing fuel through the filter, the carb, and into the bulb.
As for getting the lines through the tank, the technique I use is to cut the line at a shallow angle, say 30 degrees. this gives a tapered end about one-half inch long. I then take a sewing needle and medium-heavy thread and sew tie it to the tip of the tapered end of the line. Now you can pull the thread out of the tank and the tapered end of the line will come out easily far enough to grab it with needle-nose pliers or forceps. Once you have ahold of it, the rest is easy.
PS: Make sure you put a little fuel/oil on the outside of the line it will slide through easily, without stretching.
Tags: poulan, chainsaw, fuel, line, into tank, fuel filter, line runs, carb side, diameter line, from carb
