Question about Poulan "Poulan" Push Mower

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Pressing the primer bulb on my Poulan 450 does not inject gasoline into the carburetor; I have removed the air filter to see, because the bulb felt "softer" than it should, and no gas was injected while pressing the bulb with the filter off. Does this indicate a faulty diaphragm, and if so, how do I replace it ? Thank you.

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Yes, most likely the diaphragm needs replacing. Remover the air filter. Remove the bolt holding the front (sparkplug end) of the tank to the bracket. Next remove the long bolt to the left side of the carb. Carefully remove the governor linkage from the carb. Take pictures if necessary. With the car/tank assembly on the bench, remove the 5 phillips headed screws from the base of the carb. The carb should now lift off the tank. CLEAN EVERYTHING. Be careful not to lose the small spring and screen from the bottom of the carb. Replace the diaphragm set. Not that the rubber piece goes down on the tank first, then the paper piece, then the carb. Install and tighten the 5 screws. Hook up the gov linkage and reinstall the tank. If you put gas in while on the bench, you can pre-test the primer. Just be careful where you are apraying the fuel.
Good luck!

Posted on Aug 23, 2010

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Posted on Jan 02, 2017

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Carburetor leaks fuel in the combustion chamber and out through the area of the throttle plate into the air filter.This happened after I had to replace the fuel lines .


This is not as easy as it appears!
The image below is the proper routing for the fuel lines from the tank through the primer and carburetor.

It is so easy to assemble this backwards and pump unfiltered fuel through the carburetor. Or Assemble it so that the primer pushes fuel into the carburetor.

The primer pulls the fuel through the filter located in the tank up the inlet hose into the carburetor internal fuel pump filling up the carburetor and purging out any air. The output of the primer returns any excess fuel back into the tank via the return hose.

26117870-p2kvwqjbo3oi50ps2xua1eg1-2-0.gif The center connection at the primer bulb is the output return to the tank and the off center connection at the primer bulb is the inlet from the carburetor.

26117870-p2kvwqjbo3oi50ps2xua1eg1-2-2.png If it is correct you need to perform a leak check on the fuel system. Reach into the tank and retrieve the fuel filter attached to the hose. Carefully remove the filter from the hose and with your finger over the end of the hose pump the primer. You should hold a vacuum. If the primer will not stay down air is leaking into the fuel system. Any air will disable the engine from running. The carburetor needs to be air free to function.

If air is not leaking from a hose connection and is internal to the carburetor it is likely that contamination has logged either in the needle valve or check valve.
Below is the check valve that prevents air from entering the fuel passages from the fuel jets when you prime/purge the carburetor with the primer bulb.
26117870-p2kvwqjbo3oi50ps2xua1eg1-2-5.jpg

If the carburetor is filling with fuel when you prime it is likely that the the primer is pushing (incorrect hose routing) the fuel into the carburetor through the impulse pump and through this check valve. Correct pluming and try again.

The needle valve is located under the four screws under the diaphragm and is actuated by the diaphragm.

Cleaning the check valve is almost impossible. Most have a rubber washer that can easily be moved out of place from the use of excessive air pressure. The claim is that the check valve can be replaced. I've never been successful and ended up replacing the carburetor. Messing with the needle and diaphragm has not always resulted Joy either. You can leak check the needle valve by plugging the inlet hose and pull the fuel out the primer bulb connection using the primer bulb. Cleaning the carburetor with the small holes and blind fuel passages can create a problem by plugging the tiny fuel feed holes you are trying to clean.. In the newer machine the adjustment screws are not removable preventing the cleaning of the needle clearances. This is a bumpy road well traveled by many!!
Hope this has been a help?

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1 Answer

Idles ok revs up and stalls out


Check carburetor & air filter. Clean off all dirt and clean air filter. check age of gas. Cannot be more than 30 days old. Make sure to use fresh gas w/synthetic 2-cycle oil @ 40:1 ratio (1 gal.) Gas to 3.2 oz. Oil). Do not use old or stale oil/gas mixture. Before putting in fresh fuel, press the primer several times. A small amount of gas might show up in the fuel tank. Remove fuel. With carburetor cleaner, spray carburetor. Put in small amount of fresh fuel. Just enough to cover the fuel filter. Then press primer with fuel cap off, and watch to see if fuel is flowing smoothly. If not or if plastic primer bubble does not come back to original shape after pressing, then you have to take carburetor apart and clean or get new carburetor.

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1 Answer

How to change primer bulb on Husqvarna 125 b leaf blower


Remove air filter cover,remove air filter, remove two nuts holding the assembly,pull primer bulb assembly out,remove primer tube. Reinstall in reverse order. http://www.ebay.com/itm/530047721-POULAN-WEEDEATER-RED-SNAP-PRIMER-BULB-/190568099240?pt=LH_DefaultDomain_0&hash=item2c5ebe6da8#ht_1848wt_718


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1 Answer

When i press the primer bulb air goes into the gas tank but no gas goes into the primer bulb.


Check the fuel filter for plugging. Check the fuel lines for decay or other damage. Inspect the primer pump carefully for any cracks or holes in the bulb part. The primer is supposed to pull fuel through the carburetor from the tank supply line and filter and return it to the tank. Hope this helps!

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1 Answer

Poulan 2ooo chainsaw not pumping gas to carburator how to fix


Check the fuel filter, air filter, and muffler for plugging. Check the fuel lines for decay or other damage. Remove the carburetor, clean it inside and out with spray carburetor cleaner. Check the lower chamber diaphragm for flexibility and no damage. Check the impulse passage that comes from the crankcase, through gaskets and heat insulator, to the base of the carburetor. Does the primer bulb pump fuel into itself after several pumps? Hope some of this helps!

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1 Answer

Poulan P3400 Chainsaw Fuel Line Routing


If the saw has a primer bulb, then you require one line from it's output out to the tank return. Another line runs from the carburetor outlet to the primer inlet. Make sure that you use original rubber lines, not plastic replacements. The primer ports are found by trial and error--hook the filtered line directly to one primer port and leave the other port open. If the bulb is in good condition, and correctly connected to fuel, the bulb should fill with fuel after several pumps. If nothing, reverse the port connection at the primer--and pump test again. One of these two connections should allow pumping to occur. When you get pumping, install the tank return line to the empty primer port. Remove the filtered line from the primer and install on the carburetor. A new piece of line runs from the now empty primer port and connects to the output port on the carburetor. If the carburetor lines are correct, you should be able to pump fuel through the carburetor body and out to the primer bulb. If nothing happens, you may need to swap the carburetor lines, and you will likely need to service the carburetor. Hope this helps!

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2 Answers

Fuel line digram


Fuel systen components part numbers and a little detial can be found here:
Poulan.com
http://www.ordertree.com/modelinfo/POULAN-WEED-EATER/75.59.html
The dash number of your serial number is the type.
A helpful video, a few of my suggestions and a typical fuel system follow:
Fuel Line Replacement by SmallEng.com
http://www.youtube.com/watch?v=JrXpU70Hmi0
  • The hose in the tank with the filter on the free end connects directly to the carburetor input connection.
  • If the saw is equipped with a primer bulb, an output line from the carburetor connects to the suction side of the primer (once the bulb is collapsed it draws fuel from the tank through the carburetor to refill as it inflates).
  • The pressure side of the primer returns displaced fuel to the tank as it is depressed.
Take lots of notes and a few digital photographs to help with reassembly.
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HTH Lou

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I have a poulan 2150 chainsaw. I replaced the


Fuel Line Replacement by SmallEng.com
http://www.youtube.com/watch?v=JrXpU70Hmi0
  • The hose in the tank with the filter on the free end connects directly to the carburetor input connection.
  • If the saw is equipped with a primer, the output line from the carburetor connects to the suction side of the primer bulb (once bulb is collapsed it draws fuel from the tank through the carburetor to refill the bulb as the bulb refills).
  • The pressure side of the primer returns any excess fuel to the tank as it is depressed.
HTH
Lou

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