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Got a carb problem Its been sitting awhile and the fuel primer bulb only pushes fuel back out??

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  • Mike McDowell May 11, 2010

    Sounds like your fuel lines are routed wrong. Have the lines been changed?

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Most of us, at one time or another, leave fuel in trimmers or mowers for too long a time without running them. This causes the fuel to gum up and block passages, etc. A good idea is to add a fuel stabilizer (available at almost any hardware store) to the fuel or fuel/oil mix that you use for your small engines. It will allow the fuel to stay viable for a much longer period of time.
If you decide to diassemble your carb (which you may have to do in order to clean out the problem), and you have a digital camera, I would advise you to take pictures along the way unless you are very good at remembering where things go after you have taken them apart. You also will probably find limiter caps over the setting needles. Sometimes you can simply pull them off; sometimes it is more involved than that. I would simply try spraying a carb cleaner into the carb (with the air filter removed), letting it sit for a few minutes, then try starting again.
Hope this also helps.

Posted on Oct 15, 2009

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Posted on Jan 02, 2017

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I cant get it to start. The primer bulb wont refill with gas


The bulb pulls fuel from the carb into the bulb and back to the tank, if the bulb does not fill it is because there is a fuel blockage, either in the fuel filter in the tank, or the screen in the carb itself.

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HAVE WALBRO CARB WT324 WHEN PRIMING FLOODS THE CARB NO FUEL EXITS THE FUEL VENT HOSE ANY HELP


There are two connections on the carb, one is connected to the suction side of the primer bulb, the other to the fuel pick up pipe in the tank, the idea is the primer pulls fuel from the carb, into the bulb and back into the tank, if the pipes to and from the primer are fitted round the wrong way it will try to push fuel into the carb and make it flood, so check the suction side of the primer is connected to the carb, and the tressure side is back to the tank.

Mar 13, 2012 | Garden

1 Answer

My TB70SS Bronco weed eater primer bulb will not return when pushed, thus will not run.


something is plugging the fuel flow from tank. the primer is actually as far a fuel flow goes is after the carb. fuel goes from tank to carb to primer and back to tank. could be fuel filter gummed up or plugged. take off line coming from tank filter to carb and see if it pushes in and pops back out. if so its your fuel filter.if it still does it something is plugged in carb. there are little flapper valves in primers to allow fuel in and push fuel out. could be one of those gummed shut. all depends on it has the primer blb on carb or seperate place as to how well you can see where the problem lies.

Aug 09, 2011 | Troy-Bilt Garden

2 Answers

I'm trying to get an old weedeater/poulan 22" excalibur hedge trimmer running for my son. In the past someone has cut a fuel line going to primer bulb. I replaced that line and when I use the primer...


There are 2 different set ups for fuel lines on these 2 stroke carburetors. One has a remote primer/purge bulb and the other has the primer/purge bulb on top of the carburetor. Here are instructions on how both kind work and how to service them.

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 If you have any more questions, please post back. I will see your comment and be glad to help you,

Apr 23, 2011 | Poulan Ght225 25cc Gas Hedge Trimmer

1 Answer

Walbro WT891 carb on a Craftsman chainsaw. Carb is brand new, all fuel lines and fule filter replaced. I prime the carb with the little plunger, chainsaw starts up and runs out of fuel within 30 seconds....


Who connected these hoses? the normal routing for a machine with a primer is like this, the fuel hose from the tank with the filter on the end goes to the carb fuel inlet nozzel ( not to the primer ) nearest to the pump cover ( cover on carb held with one screw ) the pipe from the metering side of the carb connects to the shorter nozzel on the primer bulb ( suction side ), the longer nozzel on the primer ( pressure side ) connects to the pipe going back to the tank, just remember the primer pulls fuel from the carb,into the bulb, and pushes it back into the tank, it is not actually a primer it is a purge. because it is connected this way it is impossible to flood the engine no matter how many times the bulb is pressed.
Let me know if it starts and runs.

Jan 31, 2011 | Poulan Garden

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

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

1 Answer

I need a fuel line schematic for a WeedEater brand Featherlite Plus weedeater


Presuming the primer bulb is on top of the carb....Fuel filter line out of gas tank goes to the lower part if carburetor body. The other line (normally larger in size) coming out of the fuel tank goes to the primer bulb outlet on the top of carb.
If the primer/purge bulb is not on the carb, things are a little different. The fuel filter line out of the tank still goes directly to the carb, as the bulb will pull old fuel/air out of the carb allowing fresh fuel to flow in and pushes old fuel/air back to the fuel tank.
Fresh fuel in, old fuel out of the carb...you can hook up a piece of fuel line to the bulb and tell which one is pulling and which one is pushing..or depress it with your fingers on it...either way you can tell.

Jul 04, 2010 | Garden

2 Answers

Need to know how to connect the gas lines from the primer bulb to the carburetor on a poulan woodshark model 1950 chainsaw


The lines should be connected to push fuel into the carburetor. The output (overflow) of the carb is routed back into the tank. So, two lines in the tank, one is an overflow (return) and the other is the suction. On the primer one line from the tank and the other to the carb. Connect so as to "push" fuel into the carb when the primer bulb is pushed.

Jun 16, 2010 | Poulan 14 in. 2.0 Peak Horsepower Electric...

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