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Weed Eater Repair (Gas)

Updated on August 17, 2016
Weed Eater
Weed Eater | Source

Micro-Dust & Grass Trimmings

Your weed-eater won't start and the yard is beginning to look like a jungle. This can be frustrating, I know. But there is hope. You can fix the weed eater, and with a minimal amount of effort, and some tools, you'll be whacking away in no time.

There are electric weed eaters and there are gas weed eaters. This hub discusses repairing the gas type.

Weed eaters (aka. weed whackers) have very small parts. The small motor, filter, fuel lines and carburetor become clogged very easily. If the last time you used your weed eater was sometime six months ago, before winter, the dust, gas and grime, that your weed eater collected the last time it was used, have set into these small parts.

Another thing is old gas left in the carburetor has a way of turning into a jelly like substance before dehydrating and becoming a lacquer. The flow of fuel is blocked and your weed eater won't start.

But first let's go through the process of elimination to make certain that something else isn't causing the problem before digging into the carburetor.

Weed Eater Checklist

Component
Problem
Resolution
Fuel
Make sure there is fuel in the fuel tank. (I know, simple, but it happens!) Also, fuel goes bad, especially over a few months ie: winter.
Use fresh fuel.
Fuel filter
The fuel filter becomes clogged from doing its job of filtering the fuel.
Replace the flter with a new one.
Fuel lines in & out of the carburetor
Fuel lines become old and brittle. If there is the slightest crack or hole in the fuel line it will cause a problem.
Replace with new fuel line.
Spark plug
There's only one spark plug to bring this little motor to life. It needs to be clean. Normal wear & tear produces carbon build-up on the electode.
Clean the spark plug or replace with a new one.
Piston Rings (Poulan Weed Eater)
Poulan weed eater's have a tendency to blow their piston rings. They can be ordered and replaced.
Order new rings or buy a new weed eater.

Fuel

A lot of people laugh when I say, "Check for fuel in the tank". But it really happens more often than you may think. Also, if the weed eater hasn't run for several months, when you do put fuel into it, it takes a few pulls before the fuel is going to work its way through the hose, into and through the carburetor, to the firing chamber. The primer bulb helps a lot with this process, but it will be a couple more pulls than if it had been running recently.

Carb Boot

Boot
Boot | Source
Boot in place on the weed eater
Boot in place on the weed eater

Weed Eater Carburetor & Gaskets

Carburetor - Front & Back
Carburetor - Front & Back | Source
Package of gaskets
Package of gaskets | Source

Check the Boot

How did the process of elimination go? If you have eliminated the possible causes listed above (except for the piston rings that are rare, but a Poulan issue) there's one more item you should check before going any further. This item has failed two times in one season on me because of the material it's made of, rubber. It's the boot connecting the air filter intake to the engine intake. The boot is red and it's fairly easy to see just by looking down into the engine from above. The rubber breaks down quickly due to the heat it endures at it's location against the engine. The next thing you know there's a hairline crack and you're weed eater is sucking air and it doesn't work anymore.

The boot can be picked up at most hardware stores or online.

To install it just loosen the carb mounting bolts until it can be slipped into position and then re- tighten the bolts.

If the boot is fine, and the process of elimination was fine, then it's onto the carburetor.

Replacement Carburetor

These weed eater carburetor's are very reasonable to purchase new. They run $31.66 for a new carburetor (as of the date this is written 2013). Amazon.com has them even cheaper, $23! So, if you just want to get this thing running again, no hassle, then by all means purchase a new carburetor that you just screw on.

Replaceing the carburetor entails removing the fuel lines and they are delicate, so you may want to replace them at the same time.

New Carburetor

New Carburetor Installed
New Carburetor Installed

Carburetor Rebuild Photo's

Click thumbnail to view full-size
Pick up new fuel lines.Remove the filter cover.Remove the screws holding filter box on.Remove the carburetor and the old gaskets.Set the new gaskets in place and put the carburetor back on.New carburetor in place.Remove the filter. If dirty replace.Pay close attention to the routing of the hoses.
Pick up new fuel lines.
Pick up new fuel lines.
Remove the filter cover.
Remove the filter cover. | Source
Remove the screws holding filter box on.
Remove the screws holding filter box on.
Remove the carburetor and the old gaskets.
Remove the carburetor and the old gaskets.
Set the new gaskets in place and put the carburetor back on.
Set the new gaskets in place and put the carburetor back on.
New carburetor in place.
New carburetor in place.
Remove the filter. If dirty replace.
Remove the filter. If dirty replace.
Pay close attention to the routing of the hoses.
Pay close attention to the routing of the hoses.

Rebuild the Carburetor

If you like a bit of a challenge, pick up a set of gaskets for your weed eater type (or take the carburetor itself to your local hardware store). The gasket sets will run you about $5.07. You might want to replace the fuel lines while you're at it. The fuel lines may be different sizes ie: diameter. Take a piece of each hose with you to make certain you get the correct diameter fuel line. Most hardware stores normally carry the gaskets needed and the fuel lines for sure. Pick up a can of carb cleaner while you're there.

  1. Disconnect the spark plug wire to avoid accidental ignition.
  2. Remove the air filter shroud. (see thumbnail)
  3. Remove the air filter and remove the two screws holding the air filter on.
  4. Remove throttle cable.
  5. Remove fuel lines paying close attention to which one goes to the primer bulb and which one goes to the intake!
  6. Remove carburetor, boot and gaskets.
  7. Spray carb cleaner into the orifices of the carburetor.
  8. Clean the surfaces of all gasket residue.
  9. Affix new gaskets according to your weed eater.
  10. Reverse steps 1-4 and you are done!

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