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Open Question gas going to carb from tank when bulb is pushed. Filter is clean both jets are open 1 and a half turns. Put gas behind the plug and it will run for a few seconds but will not pick up the gas. Both lines are new and are on the right connections???

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  • Roy Cagle
    Roy Cagle Apr 05, 2011

    I have seen this before. Is the primer (actually its a purge) bulb on the carb or remotely mounted? I suspect either a clogged fuel filter, clogged filter screen in the carburetor (under the cover with the vent hole) or bad check valves in the primer base assembly (plate the bulb is mounted in). Post back. I would like to help.


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Posted on Jan 02, 2017

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SOURCE: Relacing fuel lines in a weedeater blower/vac

Sounds Correct on this End.

Posted on Jan 23, 2009

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SOURCE: Mcculloch 3216 starts few seconds and dies, choke must be closed.

after jerkin fingers bloody today same problem i took carb apart,,the old hoses deteorated an clogged screen on in take side/// inside of carb plate //of carb,,blew out with choke cleaner,, reassembled now runs well make sure to run same size hoses large an small,,as original other wise floods out,,,

Posted on Mar 21, 2009

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SOURCE: Troy-Bilt Chipper Shredder won't start

It takes good gas, good spark, and good air for a gasoline engine to run well. The next thing I would do is put a new air filter in it.

Posted on Apr 23, 2009

  • 71 Answers

SOURCE: Poulan weedeater will only run with choke half way on

this could one or a combination of a few things
1 check inside the tank for dirt 2check that the filter screen inside the tank is not plugged3 make sure the gas feed tube is not restricted pinched in the case or kinked also you can try a simple carb adjustment.also check to make sure the plug is gapped to the right specs good luck and i hope one of these suggestions do the trick

Posted on May 02, 2009

  • 8 Answers

SOURCE: Ryobi 700r 31cc 15" Trimmer

Just break off plastic caps to access the low and high speed jets. They are there because of government regulations to prevent users from adjusting carb in the field. They serve no other purpose.

Supply line with filter is suppose to be one piece from the tank to the carb. If it has a barb coupling in the middle then someone must have tried to patch the line at some point. You can get a replacement line and filter as part #682039 by searching online or ebay. Or you can just order line and reuse filter if it is not plugged. Required line is 3/32 ID x 3/16" OD. Both dimensions are critical. To replace line you have to take retaining ring off the bottom of the fitting on the tank (use a knife or scraper to pry it off the bulge in the hose) and push the filter fitting into the tank. Remove from tank through the fill opening. Remove piece of hose that is still on the barb. Push on new section of hose all the way to the top of the barb and right up to the filter. Put other end of hose through tank fill opening and through hole in bottom of tank. Use a piece of wire or a straightened paper clip to guide it to the hole. Pull hose through until the bulge gets to the opening. Pull hose firmly, but carefully so the hose stretches enough to allow the bulge to go into the hole in the bottom of the tank. Stop when the bottom edge of the filter is about 1/8" from the inside bottom of the tank. You should see enough of the barb end sticking through the tank for the retaining ring to be replaced on the outside bottom of the tank. If not enough exposed, pull hose through a little more. Thread line to carb input and insert. Inlet fitting will have barbs or a bulge on it. The return fitting on the carb is a straight tube with no barbs. The line from that fitting (3/32 x 3/16 also, as all lines are) goes to the top (suction side) of the primer. The other side of the primer has a line that returns to the other opening in the tank.

The return to the tank must have a fitting similar to the filter fitting, but without the filter. It is a barbed fitting with a flange ring on the end that is inside the tank and it has the retaining ring on the outside just line the supply side line. It sounds like you are missing that fitting, because you are describing the hose just being pushed up into the tank. Without that barbed fitting in place the tank will leak gas. The bulge in the line caused by the line fitting over the barbs is what seals the opening. You can order a return line kit 147290 from MTD parts that will have the line, the barb fitting and the retainer ring. In a pinch you could get use an 1/8" hose barb from a hardware store and just arefully pull it through the opening so that the bulge in the barb/hose combination is sealing the tank both inside and out. You can get by without the retaining ring. Otherwise look for a junk IDC/Ryan/Ryobi trimmer to scavange parts off of.

Sounds like you may still have a carb problem to deal with. Did you remove the needle valve to make sure it is not stuck or inlet plugged or restricted? Fuel screen clean? May need a diaphragm and gasket set. Good luck.

Posted on May 23, 2009

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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, !!

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Poulan 3314 Chainsaw Dies when I press throttle. Have done following: 1. Removed carb. Cleaned with Laq Thin. And blew out with comp.air. 2. Cleaned & Checked fuel filter. 3. Cleaned Air Filter. 4....

Check the muffler for plugging. Does the primer bulb fill with fuel when pumped several times. If it takes a lot of pumps to pull fuel, replace the fuel filter or maybe the primer bulb if it appears to be hard or cracked. #4--reset fuel jet 1-1/2 turns? You say further on that the H and L jet needles have not been moved. These two jets are the only adjustable fuel control there is. Did you mean the idle speed screw? Did you get a snappy blue spark at the plug when you checked it? The caps on the two tanks are usually not directly vented--there are vents inserted into the tank casting. Try spraying some starting fluid into the plug hole, install the plug and pull through. If pops several times, concentrate on the fuel system. When cleaning the carburetor, you should remove the two jet needles to wash out those cavities. Spray carburetor cleaner is a better cleaning agent for carburetors than lacquer thinner. The lower chamber diaphragm directly controls fuel within the carburetor and it must be flexible and no holes! Go to: http:// for some good carburetor theory for 2-strokes. Hope some of this helps!

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06 CRF 450 that went under water, not getting fuel to plug

Chances are the air filter is extremely wet. Air can't get through a wet filter, and if no air can flow through the carb, no gas can flow through either. Remove the filter and try again to get the engine started. I assume you drained and cleaned the gas tank already. If still no joy, remove the carb and clean it using spray carb cleaner. Remove the air screw and throttle screw and spray into the screw holes as well as all the little drill holes in the carb body. The object here is to clean out the pilot jet and idle circuit. When re-assembling the carb, put the air and throttle screws back in and turn them inward until they LIGHTLY seat. Now open each of them up one and one half turns. This is the factory setting. Please rate my answer.

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Only stays running on choke, sounds a bit rough, new plugs

Gas these days ****, and standing gas sucks even more. Drain your carbs and flush out your fuel tank. good luck

Jul 06, 2009 | 2002 Honda VT 750 DC Shadow Spirit

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Primer bulb on weedeater won't prime

when you prime the bulb it sucks gas from the tank with the small tube, any excess gassed pumped will be fed back to the carb via the big tube leading to the tank. If you prime it and the bulb stays pushed down, then you have a clog or kink. To fix , pull the small tube out of the tank through the fill hole. Pull off the filter on the end and put the tube back in the tank. If it primes, your fuel filter was clogged. If it still wont prime check the hose going to the carb and make sure isnt clogged or kinked.(take of carb and blow in it). If that doesnt fix it take off the bulb from the carb with two screws. The bulb assembly will come off too(rectange metal thing) Take off the two black gaskets, be carefull with them. Take off hoses from carb and bulb asembly. Blow carb cleaner in all holes and over surface. Put back together.
If the carb wont prime and the bulb isnt staying depressed. then you might have a bad bulb or carb gaskets. Make sure hoses are not cracked, cloged, or pinched.

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Trimmer fires up but then stops , I pump the bulb and it starts again but then stops

Ok... 1. Make sure your Air Cleaner is clean 2. Empty out any old gas in the system from last season. from the tank, carb, and fuel lines. 3. Make sure that the gas filter in the tank is clean and free from blockage. 4. Clean out the carb jets with spray carb cleaner. 5.Pull spark plug and clean wih carb spray as well. 6.. Reassemble n fill with fresh gas/ or gas/oil mix if 2 cycle. let me know how it goes... k

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Craftsman weedeater will not start

The most probable problem is no fuel delivery to the engine.

1. Check/replace the fuel in-tank filter, you should be able to easily blow through it once removed. The primer bulb will sink down and not return quickly if the filter is bad. Fuel will not return to the tank via the return line if the fuel filter doesn't allow fuel to be pulled in.

2. If fuel is returning to the fuel tank when the primer is pushed then your problem is inside the carb.

3. To verify this put a small quantity of gas in the lid of a water bottle (half full). And pour it into the carb throat. Replace the air filter to prevent a backfire from shooting flames out. Try to start the weedwacker. If it runs and then dies the problem is inside the carb.

4. If you are really good at working on things with small parts you can clean out the carb and replace all of the gaskets to solve the problem. If this isn't for you then you should take it to a lawn shop and have them clean the carb and replace the gaskets.

NOTE: Replacing the gaskets is very important because the gaskets get stiff and the fuel pump action of one of the gaskets is reduced or stopped.

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Ryobi 790r i have changed the gas line and the primer bulb . the primer will mash in 1 good time and then gets very hard to mash in . i fully choke it and it will crank but only for 3 seconds until it...

You cannot flood the engine by pushing the primer bulb too much, unless the hoses are hooked up backwards. The primer does not push gas to the carb, it sucks gas through the carb and returns it to the tank. Top barb on primer is the hose coming from the return side of the carb and the bottom fitting is the hose going to the return fitting on the tank. Look inside tank, it is the one without the filter on it, just a flange with a hole in the center.

If you can see gas and air bubbles moving through the primer and into the tank the hoses are on correctly. If you see bubbles going in the correct direction and then reversing when you remove your finger from the bulb, then the check valves in the primer may be bad. Replace primer.

When you say the primer "gets hard to mash", do you mean it is hard to push in or is it very slow to refill and return to the home position? If it is hard to push in and the bulb is full of gas and the hoses are on correctly then there must be a plug in the line going to the tank or the vent in the gas cap is not working. If it does not return, then it is most likely a plugged filter, plugged line from the tank to the carb, plugged screen inside the carb or a stuck needle valve. The primer is creating a slight vacuum to pull the gas through the carb, which is what the carb does when the engine is running. If there is a full or partial restiction on the supply circuit neither the primer nor the carb can pull enough gas for the engine to run. May need to disassemble carb and clean out any varnish, gunk or plugged ports/jets. Use spray carb cleaner. May want to think about a diaphagm and gasket kit if you do it yourself. If you do not feel confident in taking apart the carb, then take to a repair shop.

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