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Trimmer won't start

John Deere S1400 Line Trimmer. Replaced the primer bulb (was cracked), both fuel lines. Primer bulb does not prime fuel, remains empty.

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The fuel line may not have a good seal to the fuel tank.

Posted on Jul 11, 2010

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1 Answer

The primer bulb doesn't fill with gas


sounds like you hasve a cracked fuel line or a cracked primer bulb. that is why it cant prime.

Aug 29, 2015 | Swisher 190cc 22" String Trimmer Mower...

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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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31cc Poulan Pro Weedeater


Sounds as though the fuel filter may be plugged. The filter is in the tank. Take a look, see if it is visible. Remove and replace. Good luck...Lee

Jul 26, 2010 | Poulan 25cc 2-Cycle Gas Powered String...

2 Answers

Craftsman weed trimmer primer bulb is working in reverse


Make sure the line is near the botto ofthe tank.Thanks you for asking and I hope it helps.Please leave me a 4 thumbs up.

Jul 19, 2010 | Craftsman 25cc Gas Line Trimmer

1 Answer

I have a ryobi lawn and garden trimmer. SS26 (i t...


The fuel filter in the tank could be plugged, a fuel line gone bad, or the primer bulb has cracked, gotten hard, or otherwise rendered useless. It's possible that the lower chamber diaphragm in the carburetor is bad--hardened or cracked. The primer is supposed to pull fuel from the filter in the tank, into and through the carburetor, then out to the primer bulb, then back into the tank through another line. Go to: http://www.drystacked.com for a 12 page article on Walbro brand carburetors--very helpful. Hope this helps!

May 20, 2010 | Garden

1 Answer

John Deere S1400 won't start


I have the same problem. I replaced the primer bulb, and the fuel lines. Still no gas to the bulb; (It ran fine before I replaced the primer bulb)

Sep 24, 2009 | Garden

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

1 Answer

Craftsman trimmer won't prime


A new carburetor would be simplest solution. You could try disassembling the carb, cleaning and replacing diaphrams, but just replacing the carb would be my choice. What is the model # on the trimmer and I can tell you the part # of the carb you need.

May 24, 2009 | Craftsman 25cc Gas Line Trimmer

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