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We replaced the gas line and there is no primer bulb. There is only one line from tank to the carburetor. We can't seem to get the air out of line to keep the chainsaw running. What else can we do?

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  • akclement117 Sep 30, 2009

    We checked that out...and still nothing. Any other suggestions?

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  • Master
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Check to see if the tank has an interior fuel line as well. If it is lying in the bottom loose--fish out the end and replace it too. Check the filter on the end for plugging. It should not be necessary to bleed the fuel line.

Posted on Sep 30, 2009

  • drallim Sep 30, 2009

    The pumper inside the carburetor is probably old (rubber) and needs cleaning and a re-kit of gaskets and diaphragms. Basic setting for both jet needles is 1-1/2 turns CCW from CW stops(lightly). The engine should run with these settings. Warm up the engine, then apply full throttle and adjust H for highest speed, but 4-stroking which should immediately smooth out when cutting. At idle, adjust L for smooth idle, but allows the engine to 'follow the throttle'. Set idle speed so that the chain stops moving.

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During maintenance or replacement of the hoses it is easy to swap the hose connections at the primer. The center connection from the primer connects to the return hose that connects into the tank. The feed from the carburetor connects to the side connection of the primer bulb.

If the tank is full it can fool you as you prime because the return line to the tank that is full can be a pickup of unfiltered fuel and bring debris and air into the carburetor.

The primer pulls the fuel through the carburetor purging the air out. Usually seven strokes are recommended. You can observe through the primer bulb the air as it is purged resulting in no air left in the primer or carburetor..

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Primer bulbs pull fuel from the carb, into the bulb and dumps it back to the tank, if you have re connected the hoses to the primer the wrong way around it will try to force fuel into the carb and make it flood.

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I have no diagram but here are the instructions on how it goes.
The small diameter line out of fuel tank (has filter in-tank on end) connects directly to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then "pushes" any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. This is the return line. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb. If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where sometimes the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank. Otherwise, the line should enter the tank for about 1/2" or so.

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primers pull fuel from the carb and dumps it back into the tank, so if the bulb will not prime the chances are the fuel filter in the tank is blocked, pull the fuel hose through the filer hole and replace the filter on the end.

Jan 27, 2011 | Garden

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!

Nov 18, 2010 | Poulan Garden

1 Answer

Model # 358.797180, 200 mph. At first I thought problem was carburetor being gummed up due to being improperly winterized by previous owner. Replaced carb with new, did not fix problem. Also replaced fuel...


The primer is just a small pump that is supposed to pull fuel through the carburetor from the tank supply line/fuel filter. The filter is supposed to be connected into the longer line at the rear of the tank. This lines goes to the carburetor uppermost port and the lower port is tied to the inlet side of the primer pump. Remove the tank side line from the pump during the pump test to make sure that you are not pulling fuel into the pump from the exit line. Try pumping fuel at this point--if nothing happens, swap the port connection at the pump and try to pump again--when correct, it will fill the tank supply line first, then the exit line from the carburetor that goes to the pump and finally fill the bulb. If you don't get fuel with either connection, then you have a leaking fuel line somewhere as you have already replaced the carburetor. Most saws use a rubber fuel line, not clear plastic. Hope some of this helps!

Nov 18, 2010 | Garden

1 Answer

No gas getting from the gas tank to the carb. replaced hoses and filter already. can not even draw gas with primer button.


You either need a new primer bulb (leaking air) or you have the fuel lines routed wrong. Here is the correct fuel line routing just in case:
Small diameter line out of fuel tank (has filter in-tank on end) connects to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then pushes any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb.If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank

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1 Answer

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It's easy to mess this up as I've done it in the past. If the unit has an external purge bulb, the fuel line from the fuel tank that has the fuel filter on it goes directly to the carburetor...near the part of the carb that holds the fuel pump and has the grooved cover (where an inbuilt purge bulb would be). The other line coming out of the fuel tank goes to the purge bulb. The side of the carburetor that has the diaphragm and metering lever cover has the line going to the purge bulb. Remember, this is not really a primer...the purge bulb pulls air and old fuel out of the carb and when it does this, fresh fuel flows into it...and then the bulb pushes that air and old fuel back into the fuel tank. Hope this helps.

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Make sure the tank is filled with fresh fuel mix.Try hooking the line that goes to the tank to one of the two primer ports and operate the bulb. If it does not pull fuel in, reverse the connection to the primer and try the bulb again. Once you get fuel into the bulb, move the tank line to the other port. Install a line from the open port on the primer to the open port on the carburetor. Try the primer bulb again, it should pull new fuel from the carburetor if the two connections at the carburetor have not been reversed. This is a kind of 'hit or miss' business when connecting fuel lines that involve the primer bulb. Nothing seems to be marked on the involved parts. Hope this helps

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