Question about Homelite Mighty Lite Lawn Trimmer

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The primer bulb will not fill

When you pump the primer bulb no gas is pulled from the tank. Both tubes from the carb to the tank are clear.

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  • mkarpers2122 Nov 16, 2008

    Can't really rate the reply as I've not had time to remove and clean the carb. I'll let you know how it works out. Thanks for the info.

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The carb needs to be taken apart and cleaned out sometimes the screen gets blocked off from the fuel it gets crystalized or the pick up line from the tank is clogged im sure its the carb

Posted on Nov 14, 2008

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If there are two different size lines in the tank the smaller one is the main fuel line. The main fuel line will have the filter on the end of it in the tank and the filter should lay flat on the bottom of the tank. The main line will go directly to the carb on the fuel pump side. It is very difficult to describe and I dont have a way of giving a picture. If you have had the carb opened up the fuel pump side is the side that is mostly flat with holes and the dighram with the flaps.
The other nipple; usually more toward the center of the carb body, will go to the primer bulb. The primer bulb will have 2 different length nipples. The longer one is out to the tank, the shorter one is in from the carb. There is no need to have more than a half inch of line from the primer into the tank. when hooked up properly; as you press and release the primer bulb it will draw fuel up the main fuel line into the carb and fill the carb with fuel then from the carb to the primer bulb and fill the primer bulb with fuel then the excess fuel will be returned to the tank from the primer bulb.

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The thing to remember is that the primer pulls fuel from the carb into the bulb and dumps back to the tank, it does not push fuel into the carb, connect the fuel line from the tank to the carb connection nearest to the alluminium pump cover held with a single screw, the other one goes to the shorter of the two connections on the back of the primer.

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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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1 Answer

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The primer bulb pulls fuel from the carb, into the bulb, and pushes it back to the tank. If the bulb does not fill there will be a number of reasons why, firstly if the saw is new, there will be oil in the carb from the starting prosess at the factory, the saw will start without fuel in the bulb, but will take many more pulls to get it going, once the saw starts and runs for a few minutes the oil in the carb will clear, and the bulb will fill normally when depressed, if your arm is not up to cranking the engine many times, remove the top cover, remove the air filter, dribble some fresh fuel/oil mix down the filter elbow, the saw will start after a few pulls. If the saw is a used machine the problem may well be a blocked fuel filter in the tank.

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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

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

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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.

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2 Answers

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