String Trimmer Line Will Not Feed? Clear and Reload It

When string trimmer line will not feed, the issue is usually inside the cutting head rather than in the engine or motor. Tangled line, melted line, packed grass, incorrect line diameter, and a worn spool or eyelet can all stop normal operation. The good news is that many feeding problems can be found by opening, cleaning, and reloading the head carefully.

Safety first: Stop the trimmer and prevent an accidental start before touching the head. For a battery model, remove the battery; for a corded model, unplug it; and for a gas model, follow the exact owner’s manual for shutdown and service preparation. Wait until all moving parts stop, wear eye protection, and keep hands clear of the cutting blade on the debris guard.

This guide covers common bump-feed and manual-feed heads. Head designs differ, so use your exact operator’s manual for the specified line size, loading direction, disassembly steps, and replacement parts.

String trimmer line will not feed: start with these checks

Do not immediately force the bump knob or pull aggressively on the line. That can damage a cap, spring, spool, or eyelet. Instead, work through the problem in order. You will usually find the cause before the head needs replacement.

Confirm the trimmer is safely disabled. Set it on a stable, level surface with the cutting head facing up.
Inspect the exposed line. If both ends are very short, broken at the eyelets, or pulled back into the head, open the head instead of repeatedly bumping it.
Remove grass and debris from outside the head. Packed clippings can interfere with the bump mechanism or conceal a damaged cap.
Open the head according to the manual. Most designs use side tabs, a threaded bump knob, or a cap that releases the spool. Keep track of springs and washers if your model uses them.
Take out the spool and inspect every contact point. Look for crossed line, fused coils, damaged spool flanges, cracked caps, and worn line eyelets.

Why a weed eater line is not advancing

A weed eater line not advancing is commonly caused by line that cannot slide freely from the spool. The bump-feed system may be working normally, but the line is locked in place. These are the most likely causes.

The line is tangled, crossed, or wound in the wrong direction

Line should leave the spool smoothly when the head releases it. If coils are loose, piled over one another, or wound against the arrow shown on the spool, they can bind under tension. Remove all of the old line rather than trying to salvage a badly crossed winding.

When reloading, make neat, tight, side-by-side wraps. Avoid allowing coils to cross from one chamber into another. If the spool has separate chambers, load each line end in its assigned chamber and use the retaining notches, if provided, while reinstalling the spool.

The trimmer spool is jammed by melted or welded line

Line can fuse to itself after sustained trimming against hard surfaces such as curbs, fences, or walls. It can also bind if it was loaded with rotational twist. This is often called line welding. The line may look normal from the outside but refuse to pull free once the spool is removed.

Discard fused line and reload with fresh line of the correct type and diameter. To reduce repeat problems, avoid holding the spinning line against hard edges for long periods. When loading a conventional spool, follow the winding method in the manual so the line is not twisted as it is wrapped.

The line diameter or length is wrong

Using line that is thicker than the head is designed to accept can make a bump feed trimmer not working seem like a mechanical failure. Oversize line can drag in the eyelets, overfill the spool, and make the spool difficult to turn. Line that is too thin may break frequently or fail to stay seated as intended.

Use only the diameter and maximum line length specified for your trimmer head. Do not assume that a heavier line is an upgrade. The correct size is model-specific.

Grass, dirt, or fragments are blocking the head

Fine debris can collect beneath the cap, around the spring, in the spool channels, and inside the eyelets. A dirty head may not release line consistently even when it is loaded correctly. Brush loose material out of the parts and wipe them clean with a dry cloth. Inspect the housing for debris that prevents the spool from sitting flat.

The eyelets, spool, cap, or bump mechanism is worn

The line exits through metal or plastic eyelets. If an eyelet is rough, deeply grooved, cracked, or distorted, it can grip and shred the line. A warped spool, cracked cap, missing spring, or damaged bump knob can also prevent the feed mechanism from releasing line.

Replace damaged parts with components approved for your model. If the head has a broken internal mechanism or you cannot identify how its parts fit together, consult the owner’s manual or an authorized service professional instead of improvising a repair.

How to clear a trimmer spool jammed with line

If the trimmer spool is jammed, completely emptying and cleaning it is usually faster and more reliable than pulling at one stuck section. Follow this sequence:

Remove the cap and spool. Note the position of the spool, spring, washers, and line ends before lifting parts away.
Pull out all old line. Cut it away if it is fused, deeply tangled, brittle, or packed into the spool.
Clean the spool and housing. Remove grass, soil, loose plastic, and line fragments from the channels, cap, eyelets, and center hub.
Inspect for damage. Check the spool edges for warping, the cap tabs for cracks, and the eyelets for rough grooves. Replace rather than modify damaged parts.
Check spool movement dry. Before adding new line, place the empty spool back in the housing as the manual directs. It should sit correctly and move as designed without debris binding it.
Reload with fresh, correct-size line. A clean spool and new line remove several possible causes at once.

Do not lubricate the spool or bump mechanism unless the manufacturer specifically instructs you to do so. Added oils or sprays can collect dirt and may not be appropriate for plastic head components.

How to reload string trimmer line correctly

The exact process depends on whether you have a traditional removable spool, a pre-wound replacement spool, or an easy-load head that accepts line through the eyelets. The fundamentals are the same: correct line, correct direction, even winding, and no overfilling.

Traditional removable-spool heads

Check the operator’s manual for the approved line diameter and the line length or spool capacity.
Cut a fresh piece of line to the specified length. If the spool uses two separate line pieces, prepare both as directed.
Anchor the line in the spool’s starter hole, slot, or retaining feature.
Wind in the direction of the arrow molded into the spool. Keep the wraps tight, orderly, and level.
Leave the required amount of line free at the end. Secure the ends in the spool’s temporary retaining slots if equipped.
Route the line ends through the head eyelets as you reinstall the spool. Make sure the spool sits fully in the housing and any spring is positioned correctly.
Reinstall the cap until it locks securely. Pull the line ends gently to release them from the retaining slots.

Easy-load and feed-through heads

Many newer heads let you align marks or arrows, feed a single length of line through both eyelets, center the line, and rotate a knob or head section to wind it. This can be simpler, but the details still vary. Align the markings precisely and stop loading before the head is overfilled. If the knob is difficult to turn, remove the line and check for debris or incorrect alignment rather than forcing it.

Pre-wound replacement spools

A pre-wound spool can be the most straightforward option when it is available for your model. Transfer the line ends through the eyelets, seat the spool in the correct orientation, and reinstall the cap. Make sure both line ends extend freely before operating.

When a bump feed trimmer is not working after reloading

After reassembly, verify that the spool and cap are fully seated. Then test the line feed only as your manual directs, in a clear area and with bystanders away. The guard-mounted line-cutting blade will trim excess line during normal operation.

If a bump feed trimmer not working problem continues after a careful reload, stop and recheck these points:

The line is the exact diameter recommended for the head.
The spool was wound in the marked direction.
The line is not crossed, loose, or packed above the spool’s capacity.
The line ends are routed through the eyelets, not trapped beneath the spool or cap.
The cap, spool, spring, and bump knob are installed in the correct order.
The eyelets and spool are not worn or damaged.

Repeated failure after those checks points to a worn head, damaged internal feed parts, or a model-specific assembly issue. Refer to the exact owner’s manual and consider an authorized service professional if replacement parts or head removal are required.

Habits that help line feed reliably

Use fresh line stored in a clean, dry place.
Clean clippings from the head after use, especially before storing the trimmer.
Use the manufacturer-specified line diameter and avoid overfilling the spool.
Wind line tightly, evenly, and in the indicated direction.
Avoid prolonged hard contact between spinning line and concrete, stone, metal edging, fences, or walls.
Inspect the eyelets and cap whenever you reload line.

A string trimmer line will not feed problem is often solved by clearing the head and reloading it with the right line in the right direction. Taking a few extra minutes to clean the spool, keep the wraps even, and inspect wear parts is usually more effective than repeatedly bumping the head.

String Trimmer Line Will Not Feed: How to Clear and Reload the Spool

String trimmer line will not feed: start with these checks

Why a weed eater line is not advancing

The line is tangled, crossed, or wound in the wrong direction