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Broken air purge bulb

How do I remove the purge bulb? Do I have to remove gas tank?

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Mccullugh MCC1840 18" chainsaw. Gas pouring out bottom of saw. How do I get to the gas tank?


The fuel tank is part of the rear handle support body.
The fuel line to the carburetor goes into the top of the tank.
You will also find a return line from the air purge primer bulb. More than likely, one of these lines has broken or cracked. Gain access to some of the lines be removing the recoil assembly.
1) Remove the Air Filter and Filter Cover
(which you have already done)
2) Remove the recoil assembly to gain access to the primer lines.

Feb 14, 2017 | Garden

1 Answer

Not getting gas to the purge bulb


If thje buld itself works ok it would suggest there is either a blocked fuel filter in the fuel tank, or the internal filter in the carb is blocked , or the fuel hose is split and leaking

Jun 18, 2013 | Garden

1 Answer

HS 80 it seems that when the primer bulb is pumped it pressurizes the tank and will not strrt


First, it helps to understand what the primer/purge bulb is SUPPOSED to do. It's only purpose is to bring fresh fuel from the tank to the carburetor and push any air and old fuel in the carburetor back to the fuel tank. The fuel lines should always be pretty much full of fuel (the retun line will have fuel and air in it).The purge bulb does NOT have to be completely full to work properly.There are also very small check valves in the carburetor near the purge bulb that allow the fuel to flow in the proper direction and not backflow. Sometimes, they go bad or get stuck. This may have happened in your carb, or there is a blockage somewhere.Air and old fuel going back to the fuel tank the way it is supposed to does not pressurize the tank.Also, the tank is supposed to be vente (look for a small black piece called a duckbill under the tank cap). Make sure it is clear and clean. Check all fuel lines for blockage or debris. Sometimes, the lines themselves deteriorate from the inside-out and it is hard to notice until problems like this occur, If you want, remove and check ALL the gas lines. Remove the purge bulb and spray liberally underneath it with say WD-40. It sometimes cleans and clears the check valves.Try all these remedies and post back. I will see your comment and reply.

May 10, 2011 | Echo Garden

1 Answer

Fuel system gas tank supply setup line connetions


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

Oct 05, 2010 | Poulan 25cc 2-Cycle Gas Powered String...

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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

Oct 04, 2010 | Craftsman Convertible 25cc. Gas Line...

1 Answer

Fuel dont get in carbruator put gas in the carb thru the choke it starts but dies .i put a new gasline in it and a new carb kit Why dose pressure build in the fuel tank i removed the fuel line and gas...


When you prime/puge your carburetor, make sure fuel (w/ no air) is moving from the fuel tank towards the body of the carb. Also, make sure that there is fuel/air bubbles leaving the primer bulb and going back towards the fuel tank...and that when you push the bulb down and release it, there is no fuel movement in either line. If fuel does move when letting up on the bulb, you either have the fuel lines reversed or, the check valves in the primer base assembly are not functioning. The primer/puge valve's funcion is to draw fresh fuel into the fuel pump side of the carb and to push old fuel/air from the metering chamber side of the carb back to the fuel tank. Here is proper fuel routing:
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.

Sep 03, 2010 | Homelite Garden

1 Answer

Ho do the fule lines hook up to the carbrator


How do the fuel lines hook up to the carburetor, huh? Well...it's not too complicated. Small diameter line coming out of fuel tank goes directly to the carb on the fuel pump end..(end opposite the one with hole in the cover). The larger line coming out of the fuel tank goes to the longer nipple on the purge/primer bulb. The other line coming off of the carburetor (on the end with the hole in the cover) goes to the shorter nipple on the purge/primer bulb. The purge bulb "pulls" air and old fuel out of the carb thus allowing fresh fuel to flow in from the fuel tank and then it "pushes" this mixture of air/old fuel back to the fuel tank.

Jul 16, 2010 | Craftsman Convertible 25cc. Gas Line...

1 Answer

Troy bilt gas trimmer gas lines broke and now I'm not sure which lines go where.


The gas lines probably broke because of the ethanol-laced gasoline we have to use nowadays. It deteriorates them. If the unit has the external purge/primer bulb, the way mine did, it is not that hard. Just remember...the primer bulb "pulls" fresh fuel from the fuel tank to and thru the carb, thus pushing out any air/old fuel in the metering chamber of the carb back to the fuel tank in the return line...that said..
Fuel tank...2 lines...smaller diameter line goes directly to the carb body. There are probably 2 brass nipples on the carb. This line goes to the one on the body opposite the end of the carb with the vent-hole in the cover. This is the fuel pump end...where fresh gas enters the carb.
The larger line out of the fuel tank connects to the longer nipple on the purge/primer bulb. This is the fuel return line.
The remaining fuel line (larger diameter) goes from the vented-cover (has writing on it) end of the carb to the shorter nipple on the purge/primer bulb. This line carrys air and old fuel OUT of the carb to the bulb where it is then PUSHED back to the fuel tank via the return line...so you have a small diameter supply line to carb...an intermediate larger diameter line from the carb to the bulb and finally the larger diameter return line from the bulb BACK to the fuel tank.
Go to a small engine shop and purchase about a foot each of the 2 different diameter fuel lines needed and install those new "Tygon" fuel lines as your fuel line replacement.

Jul 09, 2010 | Troy Garden

2 Answers

Replace fuel lines,craftsman weedwacker, 358.798520 . Fuel lines disintegrated in gas tank. Three parts left in tank, fuel filter and two small plastic hose connecting items.How are these parts related to...


Fuel filter in tank with line going directly to the fuel pump side of the carburetor This is the end of the carb with a solid cover. . This line should have length in it inside the tank where it can flop around and stay on the bottom to collect fuel. The other line in the tank should have one of the little connectors on it and can be right up to where the hole in the tank is to hold it there.. This line should connect to purge/primer bulb on the longer outlet nipple. Another fuel line should run from the metering chamber side of the carb (the end with the hole in the cover) to the purge/primer bulb with the shorter outlet nipple.
The purge bulb "pulls" fresh fuel out of the tank via a vacuum created after depressing the bulb and the fresh fuel flows completely thru the carb and any air or old fuel ahead of it are drawn to the purge bulb which then "pushes" this mixture back to the fuel tank.

Jul 05, 2010 | Craftsman 25cc Gas Line Trimmer

1 Answer

Not getting fuel replaced primer and hoses and not


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.

Jun 13, 2010 | Craftsman 25cc Gas Line Trimmer

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