Question about Craftsman 25cc Gas Line Trimmer

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The primer bulb will not fill with fuel. it sounds as if there is air escaping somewhere. cannot locate the probem, and it will not start.

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First of all, the purge/primer bulb DOES NOT have to be completely full for the engine to start. Secondly, the air escaping could be a leak in the carb (a gasket) or you could have cracks at the ends of one or more of your fuel lines. Inspect the fuel lines good with the back covers off so you can see...maybe push the bulb and have someone listen for where the leak is? Different issues can be going on here too....but alot of times with these machines, it is a fuel-related issue. Where the bulb is could be leaking too (cover housing). Pull spark plug. Is it wet or smell like gas? This will let you know if gas is coming thru the carb to the engine at least. Is it clean or fouled? 2-Strokes don't do well at all with ANY air leaks and it usually causes them not to start. If one does have an air leak somewhere and by chance you get it running, you could damage the engine because of the overabundance of air intake compared to lubrication (very lean running condition)

Posted on Jul 12, 2010

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Posted on Jan 02, 2017

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Carburetor leaks fuel in the combustion chamber and out through the area of the throttle plate into the air filter.This happened after I had to replace the fuel lines .


This is not as easy as it appears!
The image below is the proper routing for the fuel lines from the tank through the primer and carburetor.

It is so easy to assemble this backwards and pump unfiltered fuel through the carburetor. Or Assemble it so that the primer pushes fuel into the carburetor.

The primer pulls the fuel through the filter located in the tank up the inlet hose into the carburetor internal fuel pump filling up the carburetor and purging out any air. The output of the primer returns any excess fuel back into the tank via the return hose.

26117870-p2kvwqjbo3oi50ps2xua1eg1-2-0.gif The center connection at the primer bulb is the output return to the tank and the off center connection at the primer bulb is the inlet from the carburetor.

26117870-p2kvwqjbo3oi50ps2xua1eg1-2-2.png If it is correct you need to perform a leak check on the fuel system. Reach into the tank and retrieve the fuel filter attached to the hose. Carefully remove the filter from the hose and with your finger over the end of the hose pump the primer. You should hold a vacuum. If the primer will not stay down air is leaking into the fuel system. Any air will disable the engine from running. The carburetor needs to be air free to function.

If air is not leaking from a hose connection and is internal to the carburetor it is likely that contamination has logged either in the needle valve or check valve.
Below is the check valve that prevents air from entering the fuel passages from the fuel jets when you prime/purge the carburetor with the primer bulb.
26117870-p2kvwqjbo3oi50ps2xua1eg1-2-5.jpg

If the carburetor is filling with fuel when you prime it is likely that the the primer is pushing (incorrect hose routing) the fuel into the carburetor through the impulse pump and through this check valve. Correct pluming and try again.

The needle valve is located under the four screws under the diaphragm and is actuated by the diaphragm.

Cleaning the check valve is almost impossible. Most have a rubber washer that can easily be moved out of place from the use of excessive air pressure. The claim is that the check valve can be replaced. I've never been successful and ended up replacing the carburetor. Messing with the needle and diaphragm has not always resulted Joy either. You can leak check the needle valve by plugging the inlet hose and pull the fuel out the primer bulb connection using the primer bulb. Cleaning the carburetor with the small holes and blind fuel passages can create a problem by plugging the tiny fuel feed holes you are trying to clean.. In the newer machine the adjustment screws are not removable preventing the cleaning of the needle clearances. This is a bumpy road well traveled by many!!
Hope this has been a help?

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2 Answers

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

I have a 124l e-tech trimmer and the prime bubble wont fill


Sounds like you have an air leak. Either in the primer bulb is split or punctured, hole or leaking fuel line or primer bulb base, and is sucking air instead of fuel.

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1 Answer

Model # 358.797180, 200 mph. At first I thought problem was carburetor being gummed up due to being improperly winterized by previous owner. Replaced carb with new, did not fix problem. Also replaced fuel...


The primer is just a small pump that is supposed to pull fuel through the carburetor from the tank supply line/fuel filter. The filter is supposed to be connected into the longer line at the rear of the tank. This lines goes to the carburetor uppermost port and the lower port is tied to the inlet side of the primer pump. Remove the tank side line from the pump during the pump test to make sure that you are not pulling fuel into the pump from the exit line. Try pumping fuel at this point--if nothing happens, swap the port connection at the pump and try to pump again--when correct, it will fill the tank supply line first, then the exit line from the carburetor that goes to the pump and finally fill the bulb. If you don't get fuel with either connection, then you have a leaking fuel line somewhere as you have already replaced the carburetor. Most saws use a rubber fuel line, not clear plastic. Hope some of this helps!

Nov 18, 2010 | Garden

1 Answer

Toro model number 200065 won't start. New gas, new spark plug, cleaned air filter. Doesn't feel like fuel is in the primer bulb when I prime it.


some toro primer bulbs don't fill up with fuel but blow air into a chamber in the carb that has fuel in it so when you press the bulb, the air sprays fuel into the carb ( just a little) So since it won't start, the bulb probably has a very small crack in it. replace it and then try it.

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1 Answer

The primer does not fill up completely and gas does not flow into the tube. I have difficulty getting the edger to start


Check that the primer bulb has no cracks in it.I would change the primer bulb you have air getting into the fuel system that is causing your fuel to run back.

Aug 08, 2009 | Troy Bilt Tiller/Edger 26cc, Model No....

1 Answer

Primer bulb won't re-fill.


Not sure about your particular set-up, but there is usually two fuel lines running from the fuel tank. One goes to the carb and the other goes on a fitting on back of the primer bulb. The primer bulb will have a second fitting with a line going to carb. Sounds like either a clogged or leaking fuel line to me. Hope this helps and good luck.

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2 Answers

My weed eater will not start


Sounds like the carb or gasket around the carb is leaking allowing the pressure to blow by when you press the primer bulb. If its not air tight it will not pop back out. Check your carb and surrounding gaskets and check for a leak.

joe

Jun 28, 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

2 Answers

Leaf blower will not continue running unless primer bulb is pushed intermittently


Hi

Priming the engine(put some gas in the sparkplug hole)..If.Start the engine.If only the gas from the cilinder is burned change the lines prom primer bulb.

best regards savumihai71

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