How to Start a Gas Weed Eater

On this page (9 sections)

1. What do you check before you start a gas weed eater?
2. How do you start a gas weed eater step by step?
3. How does the choke lever help a cold engine start?
4. What does the primer bulb do, and how many times should you press it?
5. How do you pull the cord without flooding or breaking it?
6. Why won't your gas weed eater start?
7. Which gas trimmer makes starting easy?
8. How should you store a gas weed eater so it starts next time?
9. What's the simplest way to get a gas weed eater running?

To start a gas weed eater, set the choke, prime the carburetor, and pull the cord with the throttle locked until the engine fires. Then move the choke to run and squeeze the trigger to keep it idling.

The order matters more than force. A cold two-cycle engine needs extra fuel and less air at first, and the choke and primer supply exactly that.

Get the sequence right and most trimmers catch within a few pulls.

What do you check before you start a gas weed eater?

Check fuel, the air filter, and the cutting head before you pull the cord. A trimmer that won't start often has stale mix, a clogged filter, or line jammed against the shield.

Start with the tank. Two-cycle engines run on gasoline mixed with oil, and fuel left sitting for months loses its easy-start quality.

If the mix is old or smells sour, drain it and refill with fresh fuel at the ratio your manual lists. For the full rundown on ratios and oil types, see what type of gas does a weed eater use.

Next, look at the air filter. A dirty foam or paper element starves the engine of air and makes starting hard.

Tap it clean or replace it, following the maker's interval.

Finally, clear the cutting head. Trimmed grass packed under the shield or line welded to itself adds drag that can stop a cold engine from catching.

Pull the line free and check that the head turns by hand.

How do you start a gas weed eater step by step?

Cold start: choke on, prime, pull until it fires, then choke off. The exact switch positions vary by model, so match the labels on your trimmer.

1. Set the trimmer on firm, level ground with the head clear of everything.
2. Move the choke lever to its full or cold-start position.
3. Press the primer bulb 3 to 5 times until fuel moves through the clear return line.
4. Lock the throttle if your model has a trigger lock or fast-idle setting.
5. Pull the cord with a smooth, full stroke until the engine coughs or fires.
6. Move the choke to the run position and let the engine settle into idle.
7. Squeeze the trigger to confirm the head spins, then release and let it idle.

Some trimmers fire and die on the first attempt, which is normal. Move the choke off quickly once the engine catches so it doesn't flood.

If the engine races high after starting, tap the trigger to drop it to idle.

How do you start a warm gas weed eater?

Skip the choke and prime once at most. A warm engine already has fuel in the carburetor and only needs air.

Set the switch to run, leave the choke open, and pull. If it doesn't catch after 2 or 3 pulls, press the primer once and try again.

Over-priming a warm engine is the most common cause of a flooded trimmer that won't restart after a short break.

How does the choke lever help a cold engine start?

The choke restricts air so the engine gets a richer fuel mix on a cold start. Two-cycle engines don't have fuel injection, so they rely on that richer mix to fire when cold.

Most trimmers use a lever or a combined choke and stop switch. On many models, pushing the lever past the run position also sets a fast idle that keeps the engine running until it warms.

Husqvarna's 122LK uses a SmartStart recoil system the brand says reduces the effort needed to pull the cord.

Move the choke off as soon as the engine fires. Running a warm engine with the choke on makes it smoke and lose power.

If your trimmer only stays running with the choke on, the fuel passages are likely partly blocked and need cleaning.

What does the primer bulb do, and how many times should you press it?

The primer bulb pushes fuel into the carburetor so the first pull has fuel to burn. Press it slowly and watch the clear line.

Push 3 to 5 times on a cold engine. You'll usually see fuel travel up the return line and into the bulb.

Stop once fuel is visible; extra presses just flood the carburetor.

Don't press the bulb on a warm engine unless the trimmer has sat for a while. Flooding is the usual reason a trimmer that ran fine ten minutes ago now refuses to start.

If you over-prime, set the choke open and pull several times to clear the excess.

How do you pull the cord without flooding or breaking it?

Pull straight out with one smooth stroke and let the handle retract on its own. Short, sharp yanks waste effort and flood the engine.

Grip the handle with one hand and hold the trimmer steady with the other. Pull about 12 to 18 inches in a straight line away from the engine.

A full stroke turns the engine over properly; half pulls just load the cylinder with fuel.

Let the rope back in slowly. Snapping your hand away can tangle the cord or damage the recoil spring.

Never wrap the cord around your hand or pull it past its full travel.

If nothing happens after 3 to 5 pulls, stop and rethink the choke and primer settings. Repeated blind pulling is the fastest way to flood a two-cycle engine.

Why won't your gas weed eater start?

Most no-start trimmers have flooded, lost spark, or blocked fuel. Work through the easy causes before assuming the engine is worn out.

If the trimmer is flooded, set the choke to run and pull several times with the plug out, or wait 15 to 20 minutes for fuel to evaporate. For a spark check, remove the plug, reconnect it against the engine block, and pull; a healthy plug shows a visible blue spark.

A wet, black plug points to flooding or a rich mix.

Which gas trimmer makes starting easy?

A trimmer with a smart-start system and a simple choke is the easiest to live with. Look for a clear choke lever, a primer bulb, and a stated starting method.

The Husqvarna 122LK is a 22cc two-cycle straight-shaft trimmer for occasional homeowner use. Its engine uses a SmartStart recoil system, which Husqvarna says helps it start quickly with less effort.

The 17-inch straight shaft reaches under bushes, and the T25 head takes attachments that click on for quick changes.

The Wild Badger 52cc kit is the heavier option for overgrowth. It has an 18-inch string swath and a 10-inch brush-cutter blade, plus a full-crank engine that Wild Badger Power says starts within five pulls.

The shoulder strap helps with its 24.2 lb weight.

Whatever trimmer you run, fresh line keeps the head from stalling in thick grass. The Dewalt 0.080-inch line comes on a 225-foot spool, so you can reload without a trip to the store.

How should you store a gas weed eater so it starts next time?

Run the tank low, then store the trimmer upright and dry. Old fuel is the top reason a trimmer that ran in fall won't start in spring.

Drain the tank and run the engine until it stops if the trimmer will sit for more than a month. Some owners add fuel stabilizer to a full tank instead; follow your manual's storage guidance.

Clean grass from the shield and head, and check the air filter before putting it away. Our guide to how to store a weed eater in the garage covers hanging, fuel, and winter setup.

If you'd rather skip fuel mixing and cord pulling, a battery model is simpler to store and start. Compare options in our roundup of the best cordless weed eaters for home lawns.

Not sure a gas trimmer suits your yard? Our guide to how to choose a weed eater weighs gas against cordless by lawn size and job type.

What's the simplest way to get a gas weed eater running?

The reliable routine is choke on, prime 3 to 5 times, pull in full strokes, then choke off. Most starting problems come from skipping a step or flooding the engine with extra pulls.

Work in order every time: fresh fuel, clean filter, clear head, correct choke, a few primer presses, then smooth pulls. When it fires, move the choke to run right away.

If it won't catch after a few tries, stop and check the plug and fuel before pulling again.

Once you know how to start a gas weed eater on a cold morning, the rest is habit. Store it with fresh or drained fuel, keep the line loaded, and the next start takes one or two pulls.

Frequently asked questions

How many times should I pull the cord to start a gas weed eater?

Pull with a smooth, full stroke and stop after 3 to 5 tries. If the engine doesn't fire, recheck the choke and primer instead of yanking harder.

Wild Badger Power says its 52cc engine starts within five pulls when the steps are followed.

Why does my gas weed eater only run with the choke on?

A trimmer that dies when you move the choke to run is usually running too lean or has a blocked fuel passage. Check fresh fuel, the fuel filter, and the air filter first.

If it still stalls, the carburetor likely needs adjustment by a small-engine shop.

Can I start a gas weed eater without priming it?

No, most two-cycle trimmers need the primer bulb pressed first to pull fuel into the carburetor. Press it 3 to 5 times until you see fuel move through the clear line.

Skip the primer only if your manual says the engine doesn't use one.

What fuel mix does a gas weed eater need?

Most two-cycle trimmers run on a mix of gasoline and two-cycle oil, commonly 50:1. Check your manual for the exact ratio before filling the tank.

Fresh mix used within about 30 days starts more reliably than fuel left from last season.

Should the weed eater be on the ground when I pull the cord?

Yes, rest it on firm, level ground with the cutting head clear of fences, shrubs, and your feet. A trimmer held in the air can kick or tip when the engine catches.

Keep the pull handle free to retract and never wrap the cord around your hand.

How do I stop a gas weed eater safely?

Release the throttle and let the engine drop to idle, then press the stop switch until it shuts off. If the switch doesn't work, move the choke to its full position to cut the air and stall the engine.

Let the head stop spinning before you set the trimmer down.