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Primer bulb not pumping fuel into carb, pull it out, no splits etc. Once I get fuel in it starts and runs fine??

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Probably a valve in the priming system is stuck. It allows fuel to flow into the bulb from the tank, the valve should close then and allow the bulb pressure to spray into the carburetor. Could also be the opening into the carburetor from the prime bulb is blocked.

Posted on Mar 28, 2015

  • Simon Bendall
    Simon Bendall Mar 29, 2015

    Thanks heaps! Took the carb off and blew it out with air line, pumps good and starts first time!

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Leaking primer tubes or primer
the tubes when leaking do not have to spew fuel, rather they suck air

Posted on Mar 29, 2015

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I have a CS4518 Earthquake chainsaw that will crank fine when you pump a little gas to the carb, but stops as soon as it burns the gas. I have replaced all fuel lines, primer bulb , cleaned the carb and...


Hi, OK firstly when you pump the primer bulb the primer bulb pulls fuel from the reservoir and pushes it to the carb then after around six to ten pumps the carb chamber is full and the fuel then goes back to the feservoir. Normally if you have a leak on the fuel line you get air in the priming bulb. Next thing is having primed Put the choke on full and pull the engine over a few times untill you hear it fire. Then depress the throttle and put the choke lever back to normal run position and pull the starter a couple of times untill it starts. Thats a pretty fool proff method on all two stroke machines and I have a few. Hope that is of some help.
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1 Answer

Fuel bulb will not pump


A few things can cause this. Clogged screen in carb and rotten fuel lines are the most common causes. Look inside the fuel tank. If the fuel line is stiff or discolored or if the filter has fallen off its time to replace the fuel lines. Check the fuel pump side of the carb and check the screen to see if its clogged. If the primer bulb is discolored ( any color but clear) its time to replace it. I suggest that if any one of these conditions exist to do it all at once... if the fuel lines are bad then the diaphrams are stiff, etc. Rebuild the carb and replace the fuel lines and primer bulb at the same time.
If you have just had any of the fuel lines off and the primer bulb wont pump then its possible the lines are reversed. If the primer is seperate from the carb; on the primer bulb there are two spigots, one short, and one long. The long one is output and goes to the tank, the short one is input and draws from the carb.

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Have huqvarna 350 it will not prime the bulb is good it check it . how can i check to see if it the carb or some other part of the fuel transfer system? when i pump i see the fuel from the carb being...


The bulb pulls fuel from the carb, if there is no fuel in the carb then it will not prime, reasons for no fuel in the carb is, blocked fuel filter in the tank, fuel hose trapped or split, internal filter in the carb, under the pump diaphram ( alloy cover on the carb held with a single screw ) blocked, you can test the primer, pull the two pipes off, the longer tube on the back of the primer should create a pressure when you press the bulb, the shorter connection should create a suction when you let go of the bulb.The suction side should be connected to the carb.

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1 Answer

McCulloch 28cc Gas Blower MB3200, it doesn't appear to be getting gas from the lines INTO the carb... You can pump the primer bulb but it WILL NOT push it into or out of the carb... Any help???


The primer should pull fuel out of the carb, into the bulb and dump it back to the tank, if the fuel filter in the tank is blocked, or the fuel hose is split no fuel will enter the carb, so the primer will not fill, replace the filter and the fuel hose.

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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,

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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.

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1 Answer

Cratsman 40cc chainsaw will not run. i get it started and pull the throttle open and it wants to die, sounds like it starves for fuel. put new line from tank to carb, blew out carb, dont no settings for...


A quick test to see if it's running too lean (starved for fuel) is to gently push the primer bulb. If the motor spins up (revs), it's likely a clogged high speed jet. If it stalls immediately, then it's running too rich and you need to cut back on the high jet.

See http://www.repairfaq.org/samnew/lmfaq/lmadjc.htm for some quick and dirty (but good) instructions on adjusting the jets to fine-tune your engine.

As for the primer tube, if the bulb pulls fuel and fills up when pumped 3-8 times, then things are fine. If the bulb never gets fuel, then you may have identified a potential cause (missing tube).

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Replaced my fuel lines on poulan 2050 today. The large diameter line is a return line from the primer to the tank. The smaller diameter line is the supply line from the tank to the carb. You need to cut this line and run a second piece of small diameter line from the card to the primer. I'm not sure if it makes a difference which of the two stems on the carb is the inlet or outlet line. I used the top stem as the inlet, and connected the bottom stem to the primer. My chainsaw started right up. So I either got lucky or maybe it doesn't matter.

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