Easiest way to tell you is that the primer is there to pull the fuel through the carb. so fuel filter line goes from tank to carb, then from carb to primer and then back to tank as a return. if you forget which is the in line for the carb just hook with gas in a jar and try sucking it out of the jar. put filte rin a jar. and run line to carb , then line out of carb to primer and line back to jar as a return. if it pulls freely and fills the primer bulb your ready to go. if it pulls hard or not at all something is wrong.
SOURCE: I need a diagram to see how to replace the fuel
The large hole in the tank brings a line from the filter to the upper carburetor fitting. The lower carburetor fitting goes to the primer inlet (which is found by plug and try). The short line from the tank goes to the outlet of the primer. With fuel mix in the tank, try one of the ports in the primer with the line from the carburetor. If correct, the primer bulb will fill with fuel--otherwise, try the other primer port and see if fuel will come into the bulb. This may take over 6 pumps if the carburetor is empty of fuel. Did you check the fuel filter for plugging? If it was ok, and with new lines, fuel should pump into the primer provided the carburetor is not plugged itself. If the problem seems to center on the carburetor, be sure to check the diaphragm in the lower chamber for flexibility--no holes or cracks. Also, there is a very small filter screen in the mid-body section that may be plugged. Use spray carburetor cleaner to clean the carburetor inside and out. When you get fuel to come into the bulb, the short line from the tank goes to the empty port. Hope some of this helps!
SOURCE: need diagram of fuel lines
There are 7 different types of the 1950 model (types 1 - 7) and it came with one of these 2 carbs Walbro or Zama. The carbs are different as are the fuel line connections for each one.
Although this video is for the promer bulb you can see the routing of the fuel lines.
http://www.ereplacementparts.com/article/4262/How_to_Replace_a_Primer_Bulb.html
You will have one line from the fuel tank connecting to primer bulb the 2nd line going to the carb. If you connect it backward it does not pump fuel into the carb.
Kelly
(FYI Types 1 - 5 all have the same fuel line routing.)
SOURCE: primer bulb hook up
Two lines come from the tank--one with a filter that goes to the carburetor, another with no filter which goes to the output side of the primer bulb and passes pumped fuel back to the tank. Connect only the line with the filter on the end to the primer and pump it. If nothing happens, switch the line to the other port on the bulb and pump again. With fuel mix in the tank, one of these two ports should pull fuel into the bulb. When correct, put the filter-less line on the other port of the bulb. Remove the filtered line from the bulb and hook it to the upper fuel connection on the carburetor. Use another length of fuel line to connect the now open port of the bulb to the other port on the carburetor. If the connections on the carburetor are correct, fuel will fill the bulb after a few pumps. If nothing happens, reverse the two connections at the carburetor and try to pump again. You should see fuel enter the bulb with only the correct connections at the carburetor. Usually, these connections are unidentified and must be found by trial and error. This is also a good reason for replacing only one line at a time! When fuel pumps into the bulb, attempt to start--with luck, the engine will run. Once the engine runs normally, trim the line lengths so that you have no excess line, but don't have sharp bends in any line either--they will eventually kink! Hope this helps!
SOURCE: I Need Diagram of Fuel Line Hookups For a Poulan
The line at the rear of the fuel tank with the fuel filter is the main feed line to the carburetor and connects to the upper nipple. The lower nipple on the carburetor goes to one of the primer ports, and the other primer port goes back to the tank, which has no filter on the tank end. On the primer port, it is cut and try--remove the tank return connection and leave loose. Place the main fuel line on to one of the primer ports and try to pump fuel into it with several pumps.Make sure the filter in the tank is not plugged. If nothing, shift the line to the other port of the primer and try pumping again. When successful, remove the main fuel line and return it to the upper carburetor port. Run a new line from the lower carburetor port to the active primer port and try to pump fuel again. If it won't pump fuel, reverse the two connections at the carburetor and try to pump again. If still nothing, there is trouble within the carburetor which should be cleaned with spray carburetor cleaner and maybe re-kitted. When you can finally pump fuel through the carburetor, then attach the tank return line to the open port on the primer bulb. Hope fully, the engine should run at this point. Hope this helps!
SOURCE: Just replaced fuel lines and
Line from fuel filter goes directly into the inlet of the carburetor and the line from the snap in bulb that is marked "in" attaches to the other outlet connector on the carb. Last is the long side of the bulb goes to the return on the gas tank. The snap in bulb sucks the gas but not directly from the filter hose, it does this through the carb as if it were trying to not only **** in the fuel but also removing the air trapped in the carb. You'll notice that the bulb has a **** side and a discharge side, and the **** side goes directly to the carb outlet connector. I tried to make this a clear as possible, and I hope it helps.
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