Question about Craftsman 25cc Gas Line Trimmer

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Air inside fuel lines

I have alot of air inside the fuel lines, how do i get it out? It wont stay running unless i pump the primer bulb, help please

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Sound like the pick up tube in the fuel tank is bad

Posted on Sep 07, 2009

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When I pump the primer bulb, why doesn't it fill with fuel and stays collapsed?


new carbies start around $25.00 us on e-bay so get a new carby
take it to a mower shop for a service
rebuild the carby using a new carby kit

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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

Should ther be air in primer bulb after blower is running


An air bubble may stay inside the primer bulb after starting the motor. But if you see foaming or churning fuel coming into the bulb you may have an air leak in your fuel line. This usually occurs inside the gas tank because the line becomes hardened from alcohol exposure and then the fuel clunk moving the line around causes a split near where the line passes through the tank body. Believe me....the break will get worse and one day you wont be able to keep the motor running. So now would be a good time to size up the fuel line and pick up replacements. You can swap the lines yourself with a little effort and you will save money too. Bonus!

Be safe and good luck!

Jun 14, 2014 | Echo Garden

1 Answer

Won't stay running. tries to run better if turned upside down. wont prime unless it's upside down


Fuel line is broken inside of tank. replace fuel lines and would recommend changing primer bulb as preventative maint

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1 Answer

1984 suzuki DT60 outboard set up for 5 yrs cleaned carbs got it running. wont stay running unless you pump the primer bulb. does it need a fuel pump?


yes. OR you have an air leak in the fuel system. Easy way to tell is with a clear fuel line between the fuel pump and the carb. If you see bubbles, you are looking at a new fuel line connector or aire leak at the fuel pump. If you pump up pressure with out the motor running A fault may leak gas.

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1 Answer

Modle 2075 Replaced fuel hoses now wont start, It has fuel and fire. What should I check now?


Was it running before the replacement of the fuel lines? Does the primer bulb fill with fuel when pumped? Did you replace the line inside the fuel tank? Check the fuel filter, air cleaner, and muffler for plugging. Hope this helps!

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2 Answers

Mower wont stay run n unless i hold primer in


If it is a float bowl carburetor may have a jet clogged or the primer bulb could have a hole in it. If it is a diaphragm type carburetor, the diaphragm may be stiff and needs replacing. Check it out.
Good day.

Nov 07, 2009 | Toro Garden

1 Answer

Motor will not stay running


if these parts were deteriorated then the carby diaphrams will be hard therefore they wont pump fuel.

Jul 17, 2009 | Ryobi 15" Electric Factory Reconditioned...

2 Answers

Engine won't run unless primer bulb is being pumped


I have the same problem and may have a solution. I looked at the primer pump and it was cracked letting air into the system. When I pumped it my finger was over the crack and it worked fine. When I stopped the crack was able to **** air again. Take a look.

Jun 20, 2009 | Boating

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