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Primer bulb will not prime

Put new kit in carb. and new bulb. still will not prime.

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Check and make sure the fuel filter if it has one is not clogged. Also check the fuel lines for leaks, kinks, or clogs these will all cause it not to prime. Thfuel lines can collapse internally to cause clogs which can not always be seen. So chack for clogs carefully.

Posted on Sep 23, 2009

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Posted on Jan 02, 2017

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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

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Which fuel line goes to which plastic input on the snap in primer bulb kit?


Hi Tom:
Routing is:
- tank to carb
- carb to primer
- primer to tank
The primer sucks fuel from the tank through the carb, thereby priming the carb.
If you squish the bulb, the "out" goes to the retun lint to the fuel tank.
Hope this helps.

Sep 27, 2015 | Garden

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I have 2 mowers alike both 6.5 B&S walbro carb. with primer bulb in filter housing. cleaned screen,& new gasket. nether one will prime gas in to start. what am I missing. had this happen before.


It probably that the filter housing is warped from either old age or the screws mounting it to carburetor have been overtighten warping the filter housing.

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May 02, 2015 | Garden

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Hs45 does not prime properly and won't run at full revs


Replace the carbeurator and all fuel hoses. The circuits in the carb are stopped up and they are so small they can't be properly cleaned out.

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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.
Steve

Aug 28, 2013 | Garden

1 Answer

90HP Yamaha won't turn over


It sounds like you have a air line busted somewhere i had one of my outboards do that it wouldnt prime for anything so i ran everything down checked the fuel pump and cleaned that out tore apart the carbs cleaned them bought brand new fuel hose still scratching my head i took off the air lines for the carbs and put new ones worked like a champ

Aug 22, 2012 | Boating

1 Answer

Replaced all lines (2) plus bulb and still can't prime blower.. if I put gas in spark plug hole runs fine.. even tried leaving off the filter in tank. thanks


I am under the assumption the primer bulb is atop the carburetor. There are check valves under the bulb in the primer base assembly of these carbs. Sometimes, the valves stick and sometimes they go bad completely. There are very small and for all practical purposes unserviceable, however...you can try this...pull the fuel lines off of the carb and spray WD-40 into the brass inlet and outlet. Remove the primer bulb again and liberally spray some WD onto the top of the primer base assembly...this being done in hopes of freeing up a sticky check valve. If you have extra or old fuel lines, hook them to the carb...inject WD-40 and work the bulb to attempt to move the lubricant back and forth out of the carb. Sometimes this works, sometimes not..if valves are bad. There are replaceable parts and kits for the primer base available on the manufacturers websites. The primer bulb does not have to be completely full of fuel to allow the engine to run, but the base assembly can cause problems in fuel flow to and from the carb and even mimic a flooding condition. Don't use carb cleaner and dont soak the carb in any,. Try this and post back if needed.
Please vote on this solution.

Sep 11, 2010 | Craftsman Garden

2 Answers

Cant get the mower to run after the prime is gone...any thoughts


Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming the carburetor a few times, and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
If the mower/weedeater is over a couple years old, then I also recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, You will first seat the jet screws and count the number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns they were in/out.
Please do not forget to rate me,
Thanks
Good Luck,
I hope this helped

Aug 06, 2010 | Poulan "Poulan" Push Mower

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....

Jun 21, 2010 | Garden

1 Answer

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.

Nov 11, 2009 | Homelite 'Yard Broom' Leaf Blower

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