WeedEater (Poulan) not pumping fuel after primer bulb replaced FL1500

Was running fine until a split occured in the primer bulb. Removed the bulb and
installed a new one. Now the bulb won't fill no matter how many times pressed.
Is there an o-ring under the hold-down piece? Looks like a place for one and I think maybe I lost it. That would let air escape rather than pressure the tank, eh?

I don't have a parts breakdown.

Thanks for any help. Dixieflash

 

No o-ring under it. If the bulb cracked, chances are high that the fuel lines have as well, which would cause your problem. Look at the lines inside the tank too.

 

Cheese, I removed the tubes and closely inspected and pressure tested - no cracks or leaks.

All I did was change the bulb. After it sits a day or so the bulb is about half full. Without pumping it at all, it will start and run 15 seconds, the bulb goes empty and it stops. Tried pumping the bulb when it begins fading but can't keep it going. ?? When not running, pumping the bulb does not fill it with fuel as it should. ??? Check valve in the tank cap is working. ???

The small tube is on the small, upper connection and ends just inside the tank. This is the pressure tube, right? The large tube fits on the larger connection and goes to the bottom of the tank and connects to the filter. Checked the filter - it is passing gas fine. I did not change anything but the dang bulb and here is how it acts. Used to crank in about 3 pulls and run a whole tank without missing. What the heck can be wrong? DF

 

I don't know why, but something else happened at the same time. It sounds like your inlet screen filter in the carb is clogged. It's under the cover on the opposite side of the primer.

 

Could it be that the lines are on backwards?? It can happen.

 

Here is a diagram that might help. Have a good one. Geo

[ATTACH=CONFIG]4201[/ATTACH]

 

Geogrubb, the primer section is on top of the carb, not separate as in your diagram. Not at home now but I think the carb is a Webco. Anyway, only two tubes involved. I did not change the tubes, only installed a new bulb. It appears that the bulb pushes air into the sealed tank and forces fuel up to the carb until all air is expelled from the carb and tubes. At least that's the way it used to work. Now pressing the bulb does not cause fuel to flow.

The cap vent is working, the filter is on the tank bottom and is clean, the tubes are intact - no leaks-, no air or fuel leaks under the bulb, and the carb internal screen is clean and no water. The tank has no cracks, only the tube holes and the tubes appear to seal those to prevent air escape.

Think the next step is to rig up a gravity feed tank and see if it will run. Anyone have other suggestions? Thx. Dixieflash

 

Actually, the primer draws fuel through the carb and pumps it back to the tank to prime the carburetor (get rid of the air in the carb). If it is not doing that, gravity feeding or not, it won't work. You need to find the blockage, fuel line routing error, or air leak.

 

I finally took the carb apart and although the internal fine-screen filter LOOKED clear, it was coated in a transparent film of some residue. I cleaned the screen and away she went.

Friend told me that alcohol can form a clear-looking syrup and play havock with carbs and filters. Guess he was right. No more E gas for me!

Thanks for your help. Dixieflash