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My TS 420 will not prime. I installed a new primer bulb and still no gas. Any ideas? Thanks.

Posted by Russ Arrigoni on

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techmncpa

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  • Contributor
  • 9 Answers

Check the fuel line in the tank to see if it's plugged. Also there could be crack or air leak in the full line not allowing gas to get sucked in. Just some thoughts if you haven't looked at this yet.

Posted on Jun 26, 2019

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jgwhomeequip

Jeremy Reddick

  • 1902 Answers

SOURCE: 323L Husqvarna trimmer

This sounds like the carb needs to be adjusted like it is letting to much fuel into the cylinder. There is supposed to be fuel and air mixture in the cylinder to make it fire. If there is to much fuel what will happen is that it will just build up in there and the air wont get hot enough as it compresses to start the engine.

Posted on May 21, 2009

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chrisbock

  • 199 Answers

SOURCE: primer bulb won't prime

it sounds like the filter on the fule line is cloged try to remove the filter and then try to prime the trimmer. it it does you need to replace the filter. just about any filter that will fit will do.

Posted on Jun 10, 2009

Anonymous

  • 437 Answers

SOURCE: PRIMER BULB WONT PRIME

I would recheck the carburetor to make sure you put the diaphragms next to the carburetor and not the gaskets.
Please if it is not priming you may have the fuel lines hooked up wrong. Also check the fuel cap to make sure the vent assembly is there. If the tank is not venting, the tank will get a vacuum in it not allowing fuel to flow.
HTH
Good Day.

Posted on Nov 11, 2009

Andrew White

  • 2239 Answers

SOURCE: Walbro WT891 carb on a

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.

Posted on Jan 31, 2011

pamabell

  • 316 Answers

SOURCE: 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, !!

Posted on Feb 22, 2012

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1 Answer

What is Wrong With a Stihl FS90R Trimmer When The Primer Bulb Won't Fully Fill After Priming?


1) check valves inside the primer plate is sticking
2) fuel pump diaphragm is varnished and flaps are sticking to the body of the carb
3) the cost of parts and time spent are more than a new carb
4) new carbs are updated versions and have updated ethanol resistant components
** suggest a new carb, it will solve several performance issues

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

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My prime bulb looses pressure and first start is hard. I have to remove fuel line from filter and cover with thumb prime re install then first start takes time.


Does the engine run fine after it starts? Most common problem with primer bulb losing prime is an air leak in the fuel line or primer bulb. Air leaks don't always leak fuel. If there is an air leak between the primer bulb and gas tank there is no pressure, only vacuum. If it is not a major leak it might not leak without pressure but it will allow air to enter the fuel line. If it is a very minor air leak it could allow air to replace the liquid in the fuel line over time, but so little air once it is primer again that the fuel pump can over come it with volume of fuel.

Primer bulbs do not stay firm, as they are when initially pumped up, after the engine is running. There are check valves in the primer bulb that hold pressure in the primer bulb and throughout the fuel line to the engine. Once the engine starts the fuel pump creates vacuum drawing fuel into the engine diminishing this pressure and releasing the check valves. At this point the primer bulb is just another segment of fuel hose allowing fuel to pass through it as the fuel pump demands. The primer bulb functions much better when the outlet side is higher than the inlet side. This position makes it easier for the check valves in the primer bulb to seat and release as needed. If the primer bulb is functioning properly and is positioned with the outlet side higher than the inlet it should not be necessary to cover the end of the fuel hose with your thumb to get it to prime.

If the engine is hard to start after being fully primed there could be a problem with the fuel system on the engine. Some engines are hard to prime once air has entered the system, especially fuel injected models.

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1 Answer

I have a push mower with a briggs and stratton 3.5 hp classic. The old primer bulb developed a crack in it so gas would leak out when priming but it would start and run until no more gas would go into carb...


Take the fuel bowl off the carb and check the metering valve to make sure it opens and closes sounds like its closed not allowing fuel through the carb. Its a quick easy and very cheap fix....

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1 Answer

Getting my new fuel lines in correctly from gas tank to priming bulb & from gas tank to carb.


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1 Answer

What will caus a primer bulb to leak gas directly from bulb on a craftsman snow blower ? I open the fule line at the tank and prime to start engin. Primer bulb leaks fule at center hole till i shut off...


Your primer bulb has a small hole in it, due to dry rot, you can take the bulb off and replace it with a new one very easy to replace, 4 screws, it is like a gasket.

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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.

Jun 17, 2009 | Troy Bilt Tb70ss Gas Trimmer

1 Answer

Primer bulb won't prime


it sounds like the filter on the fule line is cloged try to remove the filter and then try to prime the trimmer. it it does you need to replace the filter. just about any filter that will fit will do.

Jun 05, 2009 | Troy Bilt Tb70ss Gas Trimmer

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