Question about Homelite Mighty Lite Lawn Trimmer

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Bulb will not prime

New filter/fuel lines, new blub

Posted by Anonymous on

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Bulb or fuel line could have a crack or a clog in fuel line/filter or carburetor. Here's a video on how to change the bulb and fuel lines and another video on how to clean/rebuild the carburetor.

Homelite Tune Up

Homelite weed eater gas trimmer will not run how to rebuild weedeater...

Posted on May 09, 2015

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rycgl
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SOURCE: homelite sx135 trimer sputters , but wont stay

It maybe sounds like you need to replace the fuel lines with some of the new "Tygon" lines which are more ethanol resistant. Check in the fuel tank for the condition of the fuel filter and fuel line that hook onto itl
Cracked and/or old deterioted fuel lines will leak air, causing loss of prime. Sometimes as they deteriorate, remnants of them end up in the fine mesh fuel strainer screen on the fuel pump side of the carb, restricting fuel flow inside the carb and causing your problem. Take off the cover to the carb that doesn't have the vent-hole in it's top. That is the fuel pump side...look at the carb body under the fuel pump diaghram and you will see the round fine-mesh fuel strainer; It is press into place in the carb body but can be removed with a fine, sharp object. Check there and maybe go to the small engine parts shop and ask for about a foot of each of the 2 diameter fuel lines you will be replacing.
A carburetor diaghram kit or rebuild kit may be needed also and there are many for sale on Ebay....you need to know your carb model though.

Posted on Jul 10, 2010

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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

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

2 Answers

My chain saw 14" homelite


primers pull fuel from the carb and dumps it back into the tank, so if the bulb will not prime the chances are the fuel filter in the tank is blocked, pull the fuel hose through the filer hole and replace the filter on the end.

Jan 27, 2011 | Garden

1 Answer

Need to replace all gas lines


  1. Empty the fuel tank on the chainsaw of any remaining fuel. Pull the cap from the tank and turn the unit upside down. Drain the fuel into an approved fuel container. If the fuel is old (more than about a year) dispose of it according to local regulations for hazardous materials. (It can be kept longer by adding a fuel stabilizer.)
  2. Pull the fuel line where it attaches to the carburetor using the end of the needle-nose pliers. The old fuel line may take some force to pull free from the metal tube.
  3. Push on the fuel line to feed it into the fuel tank. Hold the chain saw upside down. Shake the unit to get the fuel filter into the opening of the tank. Pull the filter free of the tank. Feed the remaining fuel line through the access hole at the bottom of the tank. Dispose of the filter and old fuel line in accordance with disposal regulations.
  4. Feed one end of the new fuel line into and through the bottom access hole of the fuel tank. Push approximately 6 to 8 inches into the tank. You can pull back any excess line later. Grab the end of the plastic line with the needle-nose pliers. Bring the line through the gas tank fill opening.
  5. Attach the new filter to the end of the new fuel line. Feed the filter back into the fuel tank. Pull any excess line from the tank. You will want approximately 3 to 4 inches of fuel line inside the tank.
  6. Route the new fuel line to the carburetor. Cut the line to length with the cutters on the needle-nose pliers. Attach the line to the metal tube.
  7. Fill the fuel tank with fresh gas-oil fuel for 2-stroke engines and start the chainsaw. It may take a few pulls to prime the new line with fuel.
  8. Some models come with a priming bulb. Make sure you press the priming bulb three to four times before trying to start. This will prime the gas lines and remove any excess air trapped in the lines.

Nov 15, 2010 | Poulan P4018WT Wild Thing 18Inch 40cc...

1 Answer

The trimmer will not start, the prime bulb sticks when pressed, gas is not flowing through the carburator


Many things can cause the unit not to start (see www.zama.com) for troubleshooting their carbs and what causes a no-start condition. If the purge/prime bulb is sticking..there could be a bad fuel filter in the tank with a side condition of bad fuel lines...ruining the vacuum action needed to operate the bulb correctly. It helps to understand (and you may) just what the purge/primer bulb does. It "pulls" fresh fuel into the body of the carb by "pulling" out any air and old fuel in the body of the carb...then it "pushes" this air/fuel mixture (with new fuel lines you can see this) back to the fuel tank. ...and it sounds like you need new fuel lines also.

Jul 14, 2010 | Troy Garden

1 Answer

Primer bulb will not prime


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.

Sep 23, 2009 | Garden

3 Answers

I re-tubed my trimmer and now the bulb won't prime


I had exactly the same problem. On my weedeater, there is a screen in the carb under the primer bulb that was dirty from the fuel line falling apart. After replacing the fuel line AND cleaning the screen, the primer bulb will move fuel and it runs great.

Jul 06, 2009 | Craftsman 25cc Gas Line 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

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