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Has been sitting for a few years.. cleaned carb and chedcked settings on H and L screws.. still wont start.. replaced fuel lines and primer bulb.. and its a mac 3227 weedeater.. cranks but doesnt start, and cannot figure out the problem.. plz help

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Siphon out the old fuel and put brand new fuel in the tank. Change the air filter even if it looks ok. Put in a new spark plug. Then get a can of starter fluid and an assistant. Squirt some starter fluid into the air intake and start it up. have your assistant continue to spray the starter fluid for a minute or so until it runs on its own. J.

Posted on Sep 30, 2010

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When I pump the primer bulb, why doesn't it fill with fuel and stays collapsed?


new carbies start around $25.00 us on e-bay so get a new carby
take it to a mower shop for a service
rebuild the carby using a new carby kit

Nov 28, 2015 | Husqvarna 125 Bvx Leaf Blower Lawn Yard...

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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.

Jul 17, 2012 | Garden

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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.

Jun 03, 2012 | Echo 135 mph 390 CFM Gas Blower PB-250C

2 Answers

Ryobi 410 mini tiller w/Walbro WT149A primer bulb won't prime. New bulb, new fuel lines, hooked up right, carb cleaned. Been sitting for several years.Runs when fuel is pumped into the fuel inlet.


hello sir, my machine will only start when pumping primmer bulb or squirting fluid in the carburetor than stops. the fuel line has broken off, in most small carburetors this is a ongoing problem.old fuel will crystallize when left in tank for a long time.plugging up ports, fuel lines, small screen in carburetor.fuel lines will dissolve clogging carb.this is why it will run when the choke is on creating a vacuum to where there is fuel forced in the carb to rum,also the gas will evaporate leaving the oil behind clogging up carb.the thing to do is remove carb. and clean out,replacing gaskets or fuel line if necessary.use carb cleaner to clean out carb.make sure to make note where fuel line go.the fuel filter broke off of fuel line letting debris get in carb plugging it up.the muffler is known to clog up a lot on these machines where they want run. the compression should be 60 to 120 lbs any thing below 60 is junk. when adjusting the carb screws turn in all the way than turnout 1 1/4 turns turn in slow until machine runs also you need to check for spark by removing plug and grounding against engine to check spark, ok.a new spark plug would be a good ideal too , if you are going to make these repairs use new fuel line and filter,hope this helps,any comments welcome,thank you, !!

Feb 21, 2012 | Garden

1 Answer

My Craftsman 17cc gas weed trimmer wouldn't start.


Hi There, Check the primer bulb for tare or pin holes. Replace it. Check and clean carb jet it maybe plugged with debree. Also check for spark which you didn't say. Replace with correct plug.
Note; Do not use strong cleaners on rubber seals (O rings and gaskets) They dry up and crack.
If needed use a dabble of grease on seals

Jun 13, 2011 | Craftsman Garden

1 Answer

Replaced primer bulb and all fuel lines still getting air in lines. ran pretty good for about 10 minutes now will start with choke but dies in a few seconds. Cannot rev. up. cleaned under both plates but...


The primer bulb pulls fuel from bottom of fuel tank,when bulb is full it will return fuel back into tank,the hose entering bulb runs in the tank to bottom with filter on the end,the return hose stops just as it enters the tank maybe 3/4",make sure the hoses entering tank are tight fit or they will pull air in and leak.the carb may also need rebuild/clean,there is a screen inside of carb that may be stopped up which will need to be replaced.(carb kit).

Feb 18, 2011 | Troy Bilt Tb70ss Gas 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

I bought a Poulan PPB100 at a yard sale for $20.00. I got it home and got it started and running but it leaked gas like no tomorrow. I took it apart to see what was needed and found that all the fuel...


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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Aug 28, 2010 | Poulan/Weed Eater No. Te475 952711797 17"...

1 Answer

Trying to take apart to replace fuel hose.taken screws out and lid offvaccum.but will not come apart why.jerry


Sometimes, its easy to miss a "hidden" screw. The plastic case probably has plastic guides for it they may even interlock together. Search again for a "hidden" screw before giving up. You will find more than just one fuel line. Here is how you would replace them if you choose to do so (recommended).
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.

Aug 19, 2010 | Poulan Pro Super Blowervacuum

1 Answer

PRIMER BULB WONT **** FUEL INTO BULB. NO HOLE IN


Run a small paperclip into the fitting that the fuel line is attached to on the back of the primer bulb and make sure it is clean. Then go to the other end of the equation and make sure that the fitting is cleaned out on the carb where the fuel line attaches. Hope this helps and good luck.

Jul 11, 2009 | Garden

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