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Primer does;nt work. Engine will not start until manually primed. Tjhen starts on first pull. Do I need a new primer? How do I do this. Engine is a 12H882 from 1996.

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-Every small engine that comes with the prim Bold. You need to prim (Press) couple time before start. This is normal and always.
-You say you have to prim before it can start. This is normal.

Your machine is good. No need to replace any thing.


Good luck and enjoy it
Mai

Posted on May 18, 2017

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Posted on Jan 02, 2017

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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.

Dec 19, 2014 | Boating

1 Answer

How to replace carburetor priming bulb on braggs stratton engine?


you will need a sharp flat blade screw driver first take screw driver and pry out metal retaining clip once out pull out old primer ball the push new in till its seat all the way around get new retaining clip push it over primer take a socket same size as retaining clip push the ring down until seated your are done

Aug 28, 2014 | Garden

1 Answer

4 lawn mowers same problem wont start until I prime the by hand. Briggs Stratton 917.387500/ 12AV566n01124987/20043/SDSP2245D Will the same primer bulb fit the above mowers.


If its identical it should work ,if not take the old one to a mower shop,to get correct one and make sure the choke is going right on when the cable is in choke position.

Aug 05, 2014 | Ryobi Snap In Primer Bulb Pump 683974 ...

1 Answer

Fuel primer


The primer bulb fills the bowl of the carburetor on initial start-up. Most primer bulbs are depressed 4-6 times. Set the choke at half and either pull the starter cord four times. If it doesn't start, re-prime and take the choke off.

Mar 16, 2014 | Garden

1 Answer

How do you start a chainsaw


if it has a primer, prime it, put it on choke, pull the rope until it coughs like it wants to start, turn the choke off and pull until it starts. that is the basics. depending on the saw manufacturer the choke control and throttle lock may work automatically or you may have to set the throttle manually while selecting the choke position

Sep 18, 2013 | Garden

1 Answer

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

Craftsman tiller won't start unless I manually prime cylinder with gas. There is no primer bulb. Can I retrofit a primer bulb in the gas line?


Hi
You can insert a primer system into your fuel system
Just follow the fuel flow below
Please take time to rate me
Bud
10_30_2012_8_59_23_pm.gif

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possible air in the fuel system. There may be a bleeder for you to open and purge the air from the fuel system

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Lawn mower


i dont understand the pulling the button - do you mean push the primer button - if you mean primer button it sounds like the high speed jet in the carb is dirty and needs service- you can attempt to start and once engine fires have someone continually push primer to keep running it ma clear the blockage - did You check the fuel tank for any water ?

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