Question about Craftsman 25cc Gas Line Trimmer

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Fuel bulb is not bringing in fuel when pushed

Replaced the lines, but the fuel is not coming up the fuel lines when pushed. need diagram of how they should be connected.

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The larger line connects to the primer and returns fuel to tank. The smaller line has the fuel filter connected to it in the tank and connects to the small fitting on the side of carb.
Sounds like your problem is in the carb. You need to look your model up in Sears Parts because some models require replacing the entire carb.

Posted on May 06, 2010

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Posted on Jan 02, 2017

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Diagram for fuel line routing for a poulan 2150 chainsaw?


The 2150 has a remote primer, so there will be three pipes, the pipe coming from the fuel tank with the fuel filter on the end is the main fuel tube, this fits to the connection on the carb nearest to the pump cover on the carb ( alluminium cover held with a single screw ) the other connection on the carb has a pipe to the shorter of the two connections on the back of the primer ( suction side ) the longer connection on the back of the primer ( pressure side ) has a pipe back to the fuel tank, so the primer pulls fuel from the tank, into the bulb, and dumps it back to the tank, it does not push fuel into the carb, this way you can depress the bulb as many times as you like without flooding the engine.

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Model no.358791072 fuel lines were rotted.I need a diagram of the proper order


Hi and welcome to FixYa, I am Kelly.
The fuel line WITHOUT a strainer will go from the tank to the OUTSIDE primber bulb connection then from the primer bulb center connection to the carb. Item 7 this link comes with the diagrams:
http://www.searspartsdirect.com/partsdirect/part-model/Craftsman-Parts/Grass-trimmer-weed-wacker-Parts/Model-358791072/0247/1503820/P0808034/00002?blt=06&prst=0&shdMod=358791072

There are several you tube videos here on replacing fuel lines:
(do not delete) utube.png
Something to note... inside the tank there is a fuel filter/strainer. Make sure to replace that fuel line also. The connection from the strainer will connect straight to the carb fuel mainfold connection. The center connection of the primer bulb will go straight to the carb fuel manifold.

http://www.fixya.com/uploads/images/1CE2BC8.gif (Expand to 200%)

Thanks for choosing FixYa,
Kelly

Aug 07, 2011 | Craftsman 25cc Gas Line Trimmer

1 Answer

Need to know how gas lines go on a RGB3100 they rotted off need to see a diagram


I don't have a diagram, but I can explain to you the fuel line routing.
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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1 Answer

Need a diagram of fuel gas lines on a 131 poulan


Lots of research has shown a lack of diagrams on fuel line routing. Your carburetor has the purge/primer bulb on top of it. Just to help you understand how it works....the bulb uses a vacuum effect to pull fuel from the tank directly into the carburetor and the check valves in the plate under the bulb (known as the primer base assembly) push any air and old fuel inside the carb back into the fuel tank. On your model, the line inside the tank with the fuel filter on it will come out and go to the carburetor body BELOW the base assembly. The other line coming out of the tank (fuel return line) will go TO the nipple on the base assembly. The lines should be nice and soft and so should the bulb. They all have to be replaced periodically as alcohol, heat and age deteriorate them. Please post back if needed.

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1 Answer

I need a diagram to see how to replace the fuel lines on a Poulan Mod 1950 Chain Saw. I have a large hole in the right top side of the tank with a large tube going from the filter, and small hole on the...


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!

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1 Answer

Replacing fuel lines on ryobi weed eater,need


This is an ongoing issue for users, and rightfully so. 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. Years ago on 2-stroke trimmers, primers were not even used,...you choked the carb with a slide lever and gravity let fuel enter the carb from above...a few pulls, a "pop"...slide it off of choke and away you went.
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

I had to replace the primer bulb and fuel tubing. The primer bulb just disappeared, presumably blew off. I have installed the new bulb and replaced the fuel tubing, but I need to know where the tubes...


The line with the fuel filter in the end comes out of the tank and it goes to the bottom fitting on the carburator. The other line comes out of the tank and goes to the bottom fitting on the primer bulb, and the third section goes from the top fitting on primer bulb to top fitting on carburator. Got it? lol Hope this helped and best wishes.

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2 Answers

Starts and idles but dies when i pull the throttle.


Either clogged or needs cleaning/ rebuild. ITS SIMPLE! ok If you have a Walbro WT series carb "without" a built on primer bulb here it is. First off if the fuel lines disintegrated you MUST disassemble it and clean it out. The MOST infintesimle speck of gas line trapped, can allow good prime and bad operation. OK? Don't be lazy on this. Just be delicate removing the flaps gasket and diaphram. ZAMA GND-12 Is the replacement Gasket and diaphram kit fot that carb. Use a cleaner, compressed air or blow good thru it. OK Now...Primer bulb, Carb, and Fuel tank, re connects: Smaller Diameter line comes from Gas tank (Connect filter screen to this in tank) to the short Straight brass carb connector. Primer bulb suction goes to the bent carb brass connector. If small line brings fuel "in" this other line sucks it back "Thru the primer bulb" and the blow side of the primer bulb sends it back to the fuel tank! So...Small Line brings fuel "TO/IN" carb thru short brass connect on carb. Other carb connect goes to bulb suction "IN", Then primer bulb "Pressure OUT" goes thru the larger tube "back to fuel tank". Trust me I know how frustrating a simple diagram is to find online fo this set up. And if you have a carb problem on top of the hook up uncertainty you got frustration. Not only was online help hard to find (Mfg...etc NFG at all!) My local repairshop in BBrook NJ could not tell me how!!! and thats no lie! Walbro has a "generic" carb diagram but no "hook up info" specifically. Poulan don't list it either. And these things routinly fall to pcs. all 3 of mine crumpled together on yr. 3 of use.

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